mirror of
git://projects.qi-hardware.com/xue.git
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384 lines
28 KiB
Systemverilog
384 lines
28 KiB
Systemverilog
/****************************************************************************************
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*
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* Disclaimer This software code and all associated documentation, comments or other
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* of Warranty: information (collectively "Software") is provided "AS IS" without
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* warranty of any kind. MICRON TECHNOLOGY, INC. ("MTI") EXPRESSLY
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* DISCLAIMS ALL WARRANTIES EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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* TO, NONINFRINGEMENT OF THIRD PARTY RIGHTS, AND ANY IMPLIED WARRANTIES
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* OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. MTI DOES NOT
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* WARRANT THAT THE SOFTWARE WILL MEET YOUR REQUIREMENTS, OR THAT THE
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* OPERATION OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR-FREE.
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* FURTHERMORE, MTI DOES NOT MAKE ANY REPRESENTATIONS REGARDING THE USE OR
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* THE RESULTS OF THE USE OF THE SOFTWARE IN TERMS OF ITS CORRECTNESS,
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* ACCURACY, RELIABILITY, OR OTHERWISE. THE ENTIRE RISK ARISING OUT OF USE
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* OR PERFORMANCE OF THE SOFTWARE REMAINS WITH YOU. IN NO EVENT SHALL MTI,
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* ITS AFFILIATED COMPANIES OR THEIR SUPPLIERS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, CONSEQUENTIAL, INCIDENTAL, OR SPECIAL DAMAGES (INCLUDING,
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* WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION,
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* OR LOSS OF INFORMATION) ARISING OUT OF YOUR USE OF OR INABILITY TO USE
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* THE SOFTWARE, EVEN IF MTI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGES. Because some jurisdictions prohibit the exclusion or
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* limitation of liability for consequential or incidental damages, the
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* above limitation may not apply to you.
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*
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* Copyright 2003 Micron Technology, Inc. All rights reserved.
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*
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****************************************************************************************/
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// Parameters current with 2Gb datasheet rev B
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// Timing parameters based on Speed Grade
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// SYMBOL UNITS DESCRIPTION
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// ------ ----- -----------
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`ifdef sg187E
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parameter TCK_MIN = 1875; // tCK ps Minimum Clock Cycle Time
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parameter TJIT_PER = 90; // tJIT(per) ps Period JItter
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parameter TJIT_DUTY = 75; // tJIT(duty) ps Half Period Jitter
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parameter TJIT_CC = 180; // tJIT(cc) ps Cycle to Cycle jitter
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parameter TERR_2PER = 132; // tERR(nper) ps Accumulated Error (2-cycle)
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parameter TERR_3PER = 157; // tERR(nper) ps Accumulated Error (3-cycle)
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parameter TERR_4PER = 175; // tERR(nper) ps Accumulated Error (4-cycle)
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parameter TERR_5PER = 188; // tERR(nper) ps Accumulated Error (5-cycle)
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parameter TERR_N1PER = 250; // tERR(nper) ps Accumulated Error (6-10-cycle)
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parameter TERR_N2PER = 425; // tERR(nper) ps Accumulated Error (11-50-cycle)
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parameter TQHS = 250; // tQHS ps Data hold skew factor
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parameter TAC = 350; // tAC ps DQ output access time from CK/CK#
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parameter TDS = 0; // tDS ps DQ and DM input setup time relative to DQS
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parameter TDH = 75; // tDH ps DQ and DM input hold time relative to DQS
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parameter TDQSCK = 300; // tDQSCK ps DQS output access time from CK/CK#
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parameter TDQSQ = 175; // tDQSQ ps DQS-DQ skew, DQS to last DQ valid, per group, per access
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parameter TIS = 125; // tIS ps Input Setup Time
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parameter TIH = 200; // tIH ps Input Hold Time
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parameter TRC = 54000; // tRC ps Active to Active/Auto Refresh command time
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parameter TRCD = 13125; // tRCD ps Active to Read/Write command time
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parameter TWTR = 7500; // tWTR ps Write to Read command delay
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parameter TRP = 13125; // tRP ps Precharge command period
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parameter TRPA = 15000; // tRPA ps Precharge All period
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parameter TXARDS = 10; // tXARDS tCK Exit low power active power down to a read command
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parameter TXARD = 3; // tXARD tCK Exit active power down to a read command
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parameter TXP = 3; // tXP tCK Exit power down to a non-read command
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parameter TANPD = 4; // tANPD tCK ODT to power-down entry latency
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parameter TAXPD = 11; // tAXPD tCK ODT power-down exit latency
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parameter CL_TIME = 13125; // CL ps Minimum CAS Latency
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`else `ifdef sg25E
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parameter TCK_MIN = 2500; // tCK ps Minimum Clock Cycle Time
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parameter TJIT_PER = 100; // tJIT(per) ps Period JItter
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parameter TJIT_DUTY = 100; // tJIT(duty) ps Half Period Jitter
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parameter TJIT_CC = 200; // tJIT(cc) ps Cycle to Cycle jitter
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parameter TERR_2PER = 150; // tERR(nper) ps Accumulated Error (2-cycle)
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parameter TERR_3PER = 175; // tERR(nper) ps Accumulated Error (3-cycle)
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parameter TERR_4PER = 200; // tERR(nper) ps Accumulated Error (4-cycle)
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parameter TERR_5PER = 200; // tERR(nper) ps Accumulated Error (5-cycle)
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parameter TERR_N1PER = 300; // tERR(nper) ps Accumulated Error (6-10-cycle)
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parameter TERR_N2PER = 450; // tERR(nper) ps Accumulated Error (11-50-cycle)
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parameter TQHS = 300; // tQHS ps Data hold skew factor
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parameter TAC = 400; // tAC ps DQ output access time from CK/CK#
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parameter TDS = 50; // tDS ps DQ and DM input setup time relative to DQS
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parameter TDH = 125; // tDH ps DQ and DM input hold time relative to DQS
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parameter TDQSCK = 350; // tDQSCK ps DQS output access time from CK/CK#
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parameter TDQSQ = 200; // tDQSQ ps DQS-DQ skew, DQS to last DQ valid, per group, per access
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parameter TIS = 175; // tIS ps Input Setup Time
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parameter TIH = 250; // tIH ps Input Hold Time
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parameter TRC = 55000; // tRC ps Active to Active/Auto Refresh command time
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parameter TRCD = 12500; // tRCD ps Active to Read/Write command time
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parameter TWTR = 7500; // tWTR ps Write to Read command delay
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parameter TRP = 12500; // tRP ps Precharge command period
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parameter TRPA = 15000; // tRPA ps Precharge All period
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parameter TXARDS = 8; // tXARDS tCK Exit low power active power down to a read command
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parameter TXARD = 2; // tXARD tCK Exit active power down to a read command
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parameter TXP = 2; // tXP tCK Exit power down to a non-read command
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parameter TANPD = 3; // tANPD tCK ODT to power-down entry latency
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parameter TAXPD = 10; // tAXPD tCK ODT power-down exit latency
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parameter CL_TIME = 12500; // CL ps Minimum CAS Latency
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`else `ifdef sg25
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parameter TCK_MIN = 2500; // tCK ps Minimum Clock Cycle Time
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parameter TJIT_PER = 100; // tJIT(per) ps Period JItter
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parameter TJIT_DUTY = 100; // tJIT(duty) ps Half Period Jitter
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parameter TJIT_CC = 200; // tJIT(cc) ps Cycle to Cycle jitter
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parameter TERR_2PER = 150; // tERR(nper) ps Accumulated Error (2-cycle)
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parameter TERR_3PER = 175; // tERR(nper) ps Accumulated Error (3-cycle)
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parameter TERR_4PER = 200; // tERR(nper) ps Accumulated Error (4-cycle)
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parameter TERR_5PER = 200; // tERR(nper) ps Accumulated Error (5-cycle)
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parameter TERR_N1PER = 300; // tERR(nper) ps Accumulated Error (6-10-cycle)
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parameter TERR_N2PER = 450; // tERR(nper) ps Accumulated Error (11-50-cycle)
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parameter TQHS = 300; // tQHS ps Data hold skew factor
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parameter TAC = 400; // tAC ps DQ output access time from CK/CK#
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parameter TDS = 50; // tDS ps DQ and DM input setup time relative to DQS
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parameter TDH = 125; // tDH ps DQ and DM input hold time relative to DQS
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parameter TDQSCK = 350; // tDQSCK ps DQS output access time from CK/CK#
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parameter TDQSQ = 200; // tDQSQ ps DQS-DQ skew, DQS to last DQ valid, per group, per access
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parameter TIS = 175; // tIS ps Input Setup Time
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parameter TIH = 250; // tIH ps Input Hold Time
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parameter TRC = 55000; // tRC ps Active to Active/Auto Refresh command time
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parameter TRCD = 15000; // tRCD ps Active to Read/Write command time
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parameter TWTR = 7500; // tWTR ps Write to Read command delay
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parameter TRP = 15000; // tRP ps Precharge command period
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parameter TRPA = 17500; // tRPA ps Precharge All period
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parameter TXARDS = 8; // tXARDS tCK Exit low power active power down to a read command
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parameter TXARD = 2; // tXARD tCK Exit active power down to a read command
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parameter TXP = 2; // tXP tCK Exit power down to a non-read command
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parameter TANPD = 3; // tANPD tCK ODT to power-down entry latency
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parameter TAXPD = 10; // tAXPD tCK ODT power-down exit latency
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parameter CL_TIME = 15000; // CL ps Minimum CAS Latency
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`else `ifdef sg3E
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parameter TCK_MIN = 3000; // tCK ps Minimum Clock Cycle Time
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parameter TJIT_PER = 125; // tJIT(per) ps Period JItter
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parameter TJIT_DUTY = 125; // tJIT(duty) ps Half Period Jitter
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parameter TJIT_CC = 250; // tJIT(cc) ps Cycle to Cycle jitter
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parameter TERR_2PER = 175; // tERR(nper) ps Accumulated Error (2-cycle)
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parameter TERR_3PER = 225; // tERR(nper) ps Accumulated Error (3-cycle)
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parameter TERR_4PER = 250; // tERR(nper) ps Accumulated Error (4-cycle)
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parameter TERR_5PER = 250; // tERR(nper) ps Accumulated Error (5-cycle)
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parameter TERR_N1PER = 350; // tERR(nper) ps Accumulated Error (6-10-cycle)
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parameter TERR_N2PER = 450; // tERR(nper) ps Accumulated Error (11-50-cycle)
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parameter TQHS = 340; // tQHS ps Data hold skew factor
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parameter TAC = 450; // tAC ps DQ output access time from CK/CK#
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parameter TDS = 100; // tDS ps DQ and DM input setup time relative to DQS
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parameter TDH = 175; // tDH ps DQ and DM input hold time relative to DQS
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parameter TDQSCK = 400; // tDQSCK ps DQS output access time from CK/CK#
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parameter TDQSQ = 240; // tDQSQ ps DQS-DQ skew, DQS to last DQ valid, per group, per access
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parameter TIS = 200; // tIS ps Input Setup Time
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parameter TIH = 275; // tIH ps Input Hold Time
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parameter TRC = 54000; // tRC ps Active to Active/Auto Refresh command time
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parameter TRCD = 12000; // tRCD ps Active to Read/Write command time
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parameter TWTR = 7500; // tWTR ps Write to Read command delay
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parameter TRP = 12000; // tRP ps Precharge command period
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parameter TRPA = 15000; // tRPA ps Precharge All period
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parameter TXARDS = 7; // tXARDS tCK Exit low power active power down to a read command
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parameter TXARD = 2; // tXARD tCK Exit active power down to a read command
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parameter TXP = 2; // tXP tCK Exit power down to a non-read command
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parameter TANPD = 3; // tANPD tCK ODT to power-down entry latency
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parameter TAXPD = 8; // tAXPD tCK ODT power-down exit latency
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parameter CL_TIME = 12000; // CL ps Minimum CAS Latency
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`else `ifdef sg3
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parameter TCK_MIN = 3000; // tCK ps Minimum Clock Cycle Time
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parameter TJIT_PER = 125; // tJIT(per) ps Period JItter
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parameter TJIT_DUTY = 125; // tJIT(duty) ps Half Period Jitter
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parameter TJIT_CC = 250; // tJIT(cc) ps Cycle to Cycle jitter
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parameter TERR_2PER = 175; // tERR(nper) ps Accumulated Error (2-cycle)
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parameter TERR_3PER = 225; // tERR(nper) ps Accumulated Error (3-cycle)
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parameter TERR_4PER = 250; // tERR(nper) ps Accumulated Error (4-cycle)
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parameter TERR_5PER = 250; // tERR(nper) ps Accumulated Error (5-cycle)
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parameter TERR_N1PER = 350; // tERR(nper) ps Accumulated Error (6-10-cycle)
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parameter TERR_N2PER = 450; // tERR(nper) ps Accumulated Error (11-50-cycle)
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parameter TQHS = 340; // tQHS ps Data hold skew factor
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parameter TAC = 450; // tAC ps DQ output access time from CK/CK#
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parameter TDS = 100; // tDS ps DQ and DM input setup time relative to DQS
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parameter TDH = 175; // tDH ps DQ and DM input hold time relative to DQS
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parameter TDQSCK = 400; // tDQSCK ps DQS output access time from CK/CK#
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parameter TDQSQ = 240; // tDQSQ ps DQS-DQ skew, DQS to last DQ valid, per group, per access
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parameter TIS = 200; // tIS ps Input Setup Time
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parameter TIH = 275; // tIH ps Input Hold Time
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parameter TRC = 55000; // tRC ps Active to Active/Auto Refresh command time
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parameter TRCD = 15000; // tRCD ps Active to Read/Write command time
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parameter TWTR = 7500; // tWTR ps Write to Read command delay
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parameter TRP = 15000; // tRP ps Precharge command period
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parameter TRPA = 18000; // tRPA ps Precharge All period
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parameter TXARDS = 7; // tXARDS tCK Exit low power active power down to a read command
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parameter TXARD = 2; // tXARD tCK Exit active power down to a read command
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parameter TXP = 2; // tXP tCK Exit power down to a non-read command
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parameter TANPD = 3; // tANPD tCK ODT to power-down entry latency
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parameter TAXPD = 8; // tAXPD tCK ODT power-down exit latency
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parameter CL_TIME = 15000; // CL ps Minimum CAS Latency
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`else `ifdef sg37E
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parameter TCK_MIN = 3750; // tCK ps Minimum Clock Cycle Time
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parameter TJIT_PER = 125; // tJIT(per) ps Period JItter
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parameter TJIT_DUTY = 125; // tJIT(duty) ps Half Period Jitter
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parameter TJIT_CC = 250; // tJIT(cc) ps Cycle to Cycle jitter
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parameter TERR_2PER = 175; // tERR(nper) ps Accumulated Error (2-cycle)
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parameter TERR_3PER = 225; // tERR(nper) ps Accumulated Error (3-cycle)
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parameter TERR_4PER = 250; // tERR(nper) ps Accumulated Error (4-cycle)
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parameter TERR_5PER = 250; // tERR(nper) ps Accumulated Error (5-cycle)
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parameter TERR_N1PER = 350; // tERR(nper) ps Accumulated Error (6-10-cycle)
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parameter TERR_N2PER = 450; // tERR(nper) ps Accumulated Error (11-50-cycle)
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parameter TQHS = 400; // tQHS ps Data hold skew factor
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parameter TAC = 500; // tAC ps DQ output access time from CK/CK#
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parameter TDS = 100; // tDS ps DQ and DM input setup time relative to DQS
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parameter TDH = 225; // tDH ps DQ and DM input hold time relative to DQS
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parameter TDQSCK = 450; // tDQSCK ps DQS output access time from CK/CK#
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parameter TDQSQ = 300; // tDQSQ ps DQS-DQ skew, DQS to last DQ valid, per group, per access
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parameter TIS = 250; // tIS ps Input Setup Time
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parameter TIH = 375; // tIH ps Input Hold Time
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parameter TRC = 55000; // tRC ps Active to Active/Auto Refresh command time
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parameter TRCD = 15000; // tRCD ps Active to Read/Write command time
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parameter TWTR = 7500; // tWTR ps Write to Read command delay
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parameter TRP = 15000; // tRP ps Precharge command period
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parameter TRPA = 18750; // tRPA ps Precharge All period
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parameter TXARDS = 6; // tXARDS tCK Exit low power active power down to a read command
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parameter TXARD = 2; // tXARD tCK Exit active power down to a read command
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parameter TXP = 2; // tXP tCK Exit power down to a non-read command
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parameter TANPD = 3; // tANPD tCK ODT to power-down entry latency
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parameter TAXPD = 8; // tAXPD tCK ODT power-down exit latency
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parameter CL_TIME = 15000; // CL ps Minimum CAS Latency
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`else `define sg5E
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parameter TCK_MIN = 5000; // tCK ps Minimum Clock Cycle Time
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parameter TJIT_PER = 125; // tJIT(per) ps Period JItter
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parameter TJIT_DUTY = 150; // tJIT(duty) ps Half Period Jitter
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parameter TJIT_CC = 250; // tJIT(cc) ps Cycle to Cycle jitter
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parameter TERR_2PER = 175; // tERR(nper) ps Accumulated Error (2-cycle)
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parameter TERR_3PER = 225; // tERR(nper) ps Accumulated Error (3-cycle)
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parameter TERR_4PER = 250; // tERR(nper) ps Accumulated Error (4-cycle)
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parameter TERR_5PER = 250; // tERR(nper) ps Accumulated Error (5-cycle)
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parameter TERR_N1PER = 350; // tERR(nper) ps Accumulated Error (6-10-cycle)
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parameter TERR_N2PER = 450; // tERR(nper) ps Accumulated Error (11-50-cycle)
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parameter TQHS = 450; // tQHS ps Data hold skew factor
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parameter TAC = 600; // tAC ps DQ output access time from CK/CK#
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parameter TDS = 150; // tDS ps DQ and DM input setup time relative to DQS
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parameter TDH = 275; // tDH ps DQ and DM input hold time relative to DQS
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parameter TDQSCK = 500; // tDQSCK ps DQS output access time from CK/CK#
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parameter TDQSQ = 350; // tDQSQ ps DQS-DQ skew, DQS to last DQ valid, per group, per access
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parameter TIS = 350; // tIS ps Input Setup Time
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parameter TIH = 475; // tIH ps Input Hold Time
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parameter TRC = 55000; // tRC ps Active to Active/Auto Refresh command time
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parameter TRCD = 15000; // tRCD ps Active to Read/Write command time
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parameter TWTR = 10000; // tWTR ps Write to Read command delay
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parameter TRP = 15000; // tRP ps Precharge command period
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parameter TRPA = 20000; // tRPA ps Precharge All period
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parameter TXARDS = 6; // tXARDS tCK Exit low power active power down to a read command
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parameter TXARD = 2; // tXARD tCK Exit active power down to a read command
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parameter TXP = 2; // tXP tCK Exit power down to a non-read command
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parameter TANPD = 3; // tANPD tCK ODT to power-down entry latency
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parameter TAXPD = 8; // tAXPD tCK ODT power-down exit latency
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parameter CL_TIME = 15000; // CL ps Minimum CAS Latency
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`endif `endif `endif `endif `endif `endif
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`ifdef x16
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`ifdef sg187E
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parameter TFAW = 45000; // tFAW ps Four Bank Activate window
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`else `ifdef sg25E
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parameter TFAW = 45000; // tFAW ps Four Bank Activate window
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`else `ifdef sg25
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parameter TFAW = 45000; // tFAW ps Four Bank Activate window
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`else // sg3E, sg3, sg37E, sg5E
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parameter TFAW = 50000; // tFAW ps Four Bank Activate window
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`endif `endif `endif
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`else // x4, x8
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`ifdef sg187E
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parameter TFAW = 35000; // tFAW ps Four Bank Activate window
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`else `ifdef sg25E
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parameter TFAW = 35000; // tFAW ps Four Bank Activate window
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`else `ifdef sg25
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parameter TFAW = 35000; // tFAW ps Four Bank Activate window
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`else // sg3E, sg3, sg37E, sg5E
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parameter TFAW = 37500; // tFAW ps Four Bank Activate window
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`endif `endif `endif
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`endif
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// Timing Parameters
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// Mode Register
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parameter AL_MIN = 0; // AL tCK Minimum Additive Latency
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parameter AL_MAX = 6; // AL tCK Maximum Additive Latency
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parameter CL_MIN = 3; // CL tCK Minimum CAS Latency
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parameter CL_MAX = 7; // CL tCK Maximum CAS Latency
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parameter WR_MIN = 2; // WR tCK Minimum Write Recovery
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parameter WR_MAX = 8; // WR tCK Maximum Write Recovery
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parameter BL_MIN = 4; // BL tCK Minimum Burst Length
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parameter BL_MAX = 8; // BL tCK Minimum Burst Length
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// Clock
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parameter TCK_MAX = 8000; // tCK ps Maximum Clock Cycle Time
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parameter TCH_MIN = 0.48; // tCH tCK Minimum Clock High-Level Pulse Width
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parameter TCH_MAX = 0.52; // tCH tCK Maximum Clock High-Level Pulse Width
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parameter TCL_MIN = 0.48; // tCL tCK Minimum Clock Low-Level Pulse Width
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parameter TCL_MAX = 0.52; // tCL tCK Maximum Clock Low-Level Pulse Width
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// Data
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parameter TLZ = TAC; // tLZ ps Data-out low-impedance window from CK/CK#
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parameter THZ = TAC; // tHZ ps Data-out high impedance window from CK/CK#
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parameter TDIPW = 0.35; // tDIPW tCK DQ and DM input Pulse Width
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// Data Strobe
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parameter TDQSH = 0.35; // tDQSH tCK DQS input High Pulse Width
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parameter TDQSL = 0.35; // tDQSL tCK DQS input Low Pulse Width
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parameter TDSS = 0.20; // tDSS tCK DQS falling edge to CLK rising (setup time)
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parameter TDSH = 0.20; // tDSH tCK DQS falling edge from CLK rising (hold time)
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parameter TWPRE = 0.35; // tWPRE tCK DQS Write Preamble
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parameter TWPST = 0.40; // tWPST tCK DQS Write Postamble
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parameter TDQSS = 0.25; // tDQSS tCK Rising clock edge to DQS/DQS# latching transition
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// Command and Address
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parameter TIPW = 0.6; // tIPW tCK Control and Address input Pulse Width
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parameter TCCD = 2; // tCCD tCK Cas to Cas command delay
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parameter TRAS_MIN = 40000; // tRAS ps Minimum Active to Precharge command time
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parameter TRAS_MAX =70000000; // tRAS ps Maximum Active to Precharge command time
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parameter TRTP = 7500; // tRTP ps Read to Precharge command delay
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parameter TWR = 15000; // tWR ps Write recovery time
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parameter TMRD = 2; // tMRD tCK Load Mode Register command cycle time
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parameter TDLLK = 200; // tDLLK tCK DLL locking time
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// Refresh
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parameter TRFC_MIN = 197500; // tRFC ps Refresh to Refresh Command interval minimum value
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parameter TRFC_MAX =70000000; // tRFC ps Refresh to Refresh Command Interval maximum value
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// Self Refresh
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parameter TXSNR = TRFC_MIN + 10000; // tXSNR ps Exit self refesh to a non-read command
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parameter TXSRD = 200; // tXSRD tCK Exit self refresh to a read command
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parameter TISXR = TIS; // tISXR ps CKE setup time during self refresh exit.
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// ODT
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parameter TAOND = 2; // tAOND tCK ODT turn-on delay
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parameter TAOFD = 2.5; // tAOFD tCK ODT turn-off delay
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parameter TAONPD = 2000; // tAONPD ps ODT turn-on (precharge power-down mode)
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parameter TAOFPD = 2000; // tAOFPD ps ODT turn-off (precharge power-down mode)
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parameter TMOD = 12000; // tMOD ps ODT enable in EMR to ODT pin transition
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// Power Down
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parameter TCKE = 3; // tCKE tCK CKE minimum high or low pulse width
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// Size Parameters based on Part Width
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`ifdef x4
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parameter ADDR_BITS = 15; // Address Bits
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parameter ROW_BITS = 15; // Number of Address bits
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parameter COL_BITS = 11; // Number of Column bits
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parameter DM_BITS = 1; // Number of Data Mask bits
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parameter DQ_BITS = 4; // Number of Data bits
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parameter DQS_BITS = 1; // Number of Dqs bits
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parameter TRRD = 7500; // tRRD Active bank a to Active bank b command time
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`else `ifdef x8
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parameter ADDR_BITS = 15; // Address Bits
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parameter ROW_BITS = 15; // Number of Address bits
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parameter COL_BITS = 10; // Number of Column bits
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parameter DM_BITS = 1; // Number of Data Mask bits
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parameter DQ_BITS = 8; // Number of Data bits
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parameter DQS_BITS = 1; // Number of Dqs bits
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parameter TRRD = 7500; // tRRD Active bank a to Active bank b command time
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`else `define x16
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parameter ADDR_BITS = 14; // Address Bits
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parameter ROW_BITS = 14; // Number of Address bits
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parameter COL_BITS = 10; // Number of Column bits
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parameter DM_BITS = 2; // Number of Data Mask bits
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parameter DQ_BITS = 16; // Number of Data bits
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parameter DQS_BITS = 2; // Number of Dqs bits
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parameter TRRD = 10000; // tRRD Active bank a to Active bank b command time
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`endif `endif
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`ifdef QUAD_RANK
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`define DUAL_RANK // also define DUAL_RANK
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parameter CS_BITS = 4; // Number of Chip Select Bits
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parameter RANKS = 4; // Number of Chip Select Bits
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`else `ifdef DUAL_RANK
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parameter CS_BITS = 2; // Number of Chip Select Bits
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parameter RANKS = 2; // Number of Chip Select Bits
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`else
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parameter CS_BITS = 2; // Number of Chip Select Bits
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parameter RANKS = 1; // Number of Chip Select Bits
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`endif `endif
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// Size Parameters
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parameter BA_BITS = 3; // Set this parmaeter to control how many Bank Address bits
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parameter MEM_BITS = 10; // Number of write data bursts can be stored in memory. The default is 2^10=1024.
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parameter AP = 10; // the address bit that controls auto-precharge and precharge-all
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parameter BL_BITS = 3; // the number of bits required to count to MAX_BL
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parameter BO_BITS = 2; // the number of Burst Order Bits
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// Simulation parameters
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parameter STOP_ON_ERROR = 1; // If set to 1, the model will halt on command sequence/major errors
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parameter DEBUG = 1; // Turn on Debug messages
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parameter BUS_DELAY = 0; // delay in nanoseconds
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parameter RANDOM_OUT_DELAY = 0; // If set to 1, the model will put a random amount of delay on DQ/DQS during reads
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parameter RANDOM_SEED = 711689044; //seed value for random generator.
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parameter RDQSEN_PRE = 2; // DQS driving time prior to first read strobe
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parameter RDQSEN_PST = 1; // DQS driving time after last read strobe
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parameter RDQS_PRE = 2; // DQS low time prior to first read strobe
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parameter RDQS_PST = 1; // DQS low time after last valid read strobe
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parameter RDQEN_PRE = 0; // DQ/DM driving time prior to first read data
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parameter RDQEN_PST = 0; // DQ/DM driving time after last read data
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parameter WDQS_PRE = 1; // DQS half clock periods prior to first write strobe
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parameter WDQS_PST = 1; // DQS half clock periods after last valid write strobe
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