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xue/sim/verilog/micron_2048Mb_ddr2/tb.v

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/****************************************************************************************
*
* File Name: tb.v
*
* Dependencies: ddr2.v, ddr2_parameters.vh
*
* Description: Micron SDRAM DDR2 (Double Data Rate 2) test bench
*
* Note: -Set simulator resolution to "ps" accuracy
* -Set Debug = 0 to disable $display messages
*
* Disclaimer This software code and all associated documentation, comments or other
* of Warranty: information (collectively "Software") is provided "AS IS" without
* warranty of any kind. MICRON TECHNOLOGY, INC. ("MTI") EXPRESSLY
* DISCLAIMS ALL WARRANTIES EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO, NONINFRINGEMENT OF THIRD PARTY RIGHTS, AND ANY IMPLIED WARRANTIES
* OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. MTI DOES NOT
* WARRANT THAT THE SOFTWARE WILL MEET YOUR REQUIREMENTS, OR THAT THE
* OPERATION OF THE SOFTWARE WILL BE UNINTERRUPTED OR ERROR-FREE.
* FURTHERMORE, MTI DOES NOT MAKE ANY REPRESENTATIONS REGARDING THE USE OR
* THE RESULTS OF THE USE OF THE SOFTWARE IN TERMS OF ITS CORRECTNESS,
* ACCURACY, RELIABILITY, OR OTHERWISE. THE ENTIRE RISK ARISING OUT OF USE
* OR PERFORMANCE OF THE SOFTWARE REMAINS WITH YOU. IN NO EVENT SHALL MTI,
* ITS AFFILIATED COMPANIES OR THEIR SUPPLIERS BE LIABLE FOR ANY DIRECT,
* INDIRECT, CONSEQUENTIAL, INCIDENTAL, OR SPECIAL DAMAGES (INCLUDING,
* WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION,
* OR LOSS OF INFORMATION) ARISING OUT OF YOUR USE OF OR INABILITY TO USE
* THE SOFTWARE, EVEN IF MTI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGES. Because some jurisdictions prohibit the exclusion or
* limitation of liability for consequential or incidental damages, the
* above limitation may not apply to you.
*
* Copyright 2003 Micron Technology, Inc. All rights reserved.
*
****************************************************************************************/
// DO NOT CHANGE THE TIMESCALE
`timescale 1ps / 1ps
module tb;
`include "ddr2_parameters.vh"
// ports
reg ck;
wire ck_n = ~ck;
reg cke;
reg cs_n;
reg ras_n;
reg cas_n;
reg we_n;
reg [BA_BITS-1:0] ba;
reg [ADDR_BITS-1:0] a;
wire [DM_BITS-1:0] dm;
wire [DQ_BITS-1:0] dq;
wire [DQS_BITS-1:0] dqs;
wire [DQS_BITS-1:0] dqs_n;
wire [DQS_BITS-1:0] rdqs_n;
reg odt;
// mode registers
reg [ADDR_BITS-1:0] mode_reg0; //Mode Register
reg [ADDR_BITS-1:0] mode_reg1; //Extended Mode Register
wire [2:0] cl = mode_reg0[6:4]; //CAS Latency
wire bo = mode_reg0[3]; //Burst Order
wire [7:0] bl = (1<<mode_reg0[2:0]); //Burst Length
wire rdqs_en = mode_reg1[11]; //RDQS Enable
wire dqs_n_en = ~mode_reg1[10]; //dqs# Enable
wire [2:0] al = mode_reg1[5:3]; //Additive Latency
wire [3:0] rl = al + cl; //Read Latency
wire [3:0] wl = al + cl-1'b1; //Write Latency
// dq transmit
reg dq_en;
reg [DM_BITS-1:0] dm_out;
reg [DQ_BITS-1:0] dq_out;
reg dqs_en;
reg [DQS_BITS-1:0] dqs_out;
assign dm = dq_en ? dm_out : {DM_BITS{1'bz}};
assign dq = dq_en ? dq_out : {DQ_BITS{1'bz}};
assign dqs = dqs_en ? dqs_out : {DQS_BITS{1'bz}};
assign dqs_n = (dqs_en & dqs_n_en) ? ~dqs_out : {DQS_BITS{1'bz}};
// dq receive
reg [DM_BITS-1:0] dm_fifo [2*(AL_MAX+CL_MAX)+BL_MAX:0];
reg [DQ_BITS-1:0] dq_fifo [2*(AL_MAX+CL_MAX)+BL_MAX:0];
wire [DQ_BITS-1:0] q0, q1, q2, q3;
reg [1:0] burst_cntr;
assign rdqs_n = {DQS_BITS{1'bz}};
// timing definition in tCK units
real tck;
wire [11:0] taa = ceil(CL_TIME/tck);
wire [11:0] tanpd = TANPD;
wire [11:0] taond = TAOND;
wire [11:0] taofd = ceil(TAOFD);
wire [11:0] taxpd = TAXPD;
wire [11:0] tccd = TCCD;
wire [11:0] tcke = TCKE;
wire [11:0] tdllk = TDLLK;
wire [11:0] tfaw = ceil(TFAW/tck);
wire [11:0] tmod = ceil(TMOD/tck);
wire [11:0] tmrd = TMRD;
wire [11:0] tras = ceil(TRAS_MIN/tck);
wire [11:0] trc = TRC;
wire [11:0] trcd = ceil(TRCD/tck);
wire [11:0] trfc = ceil(TRFC_MIN/tck);
wire [11:0] trp = ceil(TRP/tck);
wire [11:0] trrd = ceil(TRRD/tck);
wire [11:0] trtp = ceil(TRTP/tck);
wire [11:0] twr = ceil(TWR/tck);
wire [11:0] twtr = ceil(TWTR/tck);
wire [11:0] txard = TXARD;
wire [11:0] txards = TXARDS;
wire [11:0] txp = TXP;
wire [11:0] txsnr = ceil(TXSNR/tck);
wire [11:0] txsrd = TXSRD;
initial begin
$timeformat (-9, 1, " ns", 1);
`ifdef period
tck <= `period;
`else
tck <= TCK_MIN;
`endif
ck <= 1'b1;
end
// component instantiation
ddr2 sdramddr2 (
ck,
ck_n,
cke,
cs_n,
ras_n,
cas_n,
we_n,
dm,
ba,
a,
dq,
dqs,
dqs_n,
rdqs_n,
odt
);
// clock generator
always @(posedge ck) begin
ck <= #(tck/2) 1'b0;
ck <= #(tck) 1'b1;
end
function integer ceil;
input number;
real number;
if (number > $rtoi(number))
ceil = $rtoi(number) + 1;
else
ceil = number;
endfunction
function integer max;
input arg1;
input arg2;
integer arg1;
integer arg2;
if (arg1 > arg2)
max = arg1;
else
max = arg2;
endfunction
task power_up;
begin
cke <= 1'b0;
odt <= 1'b0;
repeat(10) @(negedge ck);
cke <= 1'b1;
nop (400000/tck+1);
end
endtask
task load_mode;
input [BA_BITS-1:0] bank;
input [ADDR_BITS-1:0] addr;
begin
case (bank)
0: mode_reg0 = addr;
1: mode_reg1 = addr;
endcase
cke <= 1'b1;
cs_n <= 1'b0;
ras_n <= 1'b0;
cas_n <= 1'b0;
we_n <= 1'b0;
ba <= bank;
a <= addr;
@(negedge ck);
end
endtask
task refresh;
begin
cke <= 1'b1;
cs_n <= 1'b0;
ras_n <= 1'b0;
cas_n <= 1'b0;
we_n <= 1'b1;
@(negedge ck);
end
endtask
task precharge;
input [BA_BITS-1:0] bank;
input ap; //precharge all
begin
cke <= 1'b1;
cs_n <= 1'b0;
ras_n <= 1'b0;
cas_n <= 1'b1;
we_n <= 1'b0;
ba <= bank;
a <= (ap<<10);
@(negedge ck);
end
endtask
task activate;
input [BA_BITS-1:0] bank;
input [ROW_BITS-1:0] row;
begin
cke <= 1'b1;
cs_n <= 1'b0;
ras_n <= 1'b0;
cas_n <= 1'b1;
we_n <= 1'b1;
ba <= bank;
a <= row;
@(negedge ck);
end
endtask
//write task supports burst lengths <= 8
task write;
input [BA_BITS-1:0] bank;
input [COL_BITS-1:0] col;
input ap; //Auto Precharge
input [8*DM_BITS-1:0] dm;
input [8*DQ_BITS-1:0] dq;
reg [ADDR_BITS-1:0] atemp [1:0];
integer i;
begin
cke <= 1'b1;
cs_n <= 1'b0;
ras_n <= 1'b1;
cas_n <= 1'b0;
we_n <= 1'b0;
ba <= bank;
atemp[0] = col & 10'h3ff; //addr[ 9: 0] = COL[ 9: 0]
atemp[1] = (col>>10)<<11; //addr[ N:11] = COL[ N:10]
a <= atemp[0] | atemp[1] | (ap<<10);
for (i=0; i<=bl; i=i+1) begin
dqs_en <= #(wl*tck + i*tck/2) 1'b1;
if (i%2 == 0) begin
dqs_out <= #(wl*tck + i*tck/2) {DQS_BITS{1'b0}};
end else begin
dqs_out <= #(wl*tck + i*tck/2) {DQS_BITS{1'b1}};
end
dq_en <= #(wl*tck + i*tck/2 + tck/4) 1'b1;
dm_out <= #(wl*tck + i*tck/2 + tck/4) dm>>i*DM_BITS;
dq_out <= #(wl*tck + i*tck/2 + tck/4) dq>>i*DQ_BITS;
end
dqs_en <= #(wl*tck + bl*tck/2 + tck/2) 1'b0;
dq_en <= #(wl*tck + bl*tck/2 + tck/4) 1'b0;
@(negedge ck);
end
endtask
// read without data verification
task read;
input [BA_BITS-1:0] bank;
input [COL_BITS-1:0] col;
input ap; //Auto Precharge
reg [ADDR_BITS-1:0] atemp [1:0];
begin
cke <= 1'b1;
cs_n <= 1'b0;
ras_n <= 1'b1;
cas_n <= 1'b0;
we_n <= 1'b1;
ba <= bank;
atemp[0] = col & 10'h3ff; //addr[ 9: 0] = COL[ 9: 0]
atemp[1] = (col>>10)<<11; //addr[ N:11] = COL[ N:10]
a <= atemp[0] | atemp[1] | (ap<<10);
@(negedge ck);
end
endtask
task nop;
input [31:0] count;
begin
cke <= 1'b1;
cs_n <= 1'b0;
ras_n <= 1'b1;
cas_n <= 1'b1;
we_n <= 1'b1;
repeat(count) @(negedge ck);
end
endtask
task deselect;
input [31:0] count;
begin
cke <= 1'b1;
cs_n <= 1'b1;
ras_n <= 1'b1;
cas_n <= 1'b1;
we_n <= 1'b1;
repeat(count) @(negedge ck);
end
endtask
task power_down;
input [31:0] count;
begin
cke <= 1'b0;
cs_n <= 1'b1;
ras_n <= 1'b1;
cas_n <= 1'b1;
we_n <= 1'b1;
repeat(count) @(negedge ck);
end
endtask
task self_refresh;
input [31:0] count;
begin
cke <= 1'b0;
cs_n <= 1'b0;
ras_n <= 1'b0;
cas_n <= 1'b0;
we_n <= 1'b1;
cs_n <= #(tck) 1'b1;
ras_n <= #(tck) 1'b1;
cas_n <= #(tck) 1'b1;
we_n <= #(tck) 1'b1;
repeat(count) @(negedge ck);
end
endtask
// read with data verification
task read_verify;
input [BA_BITS-1:0] bank;
input [COL_BITS-1:0] col;
input ap; //Auto Precharge
input [8*DM_BITS-1:0] dm; //Expected Data Mask
input [8*DQ_BITS-1:0] dq; //Expected Data
integer i;
begin
read (bank, col, ap);
for (i=0; i<bl; i=i+1) begin
dm_fifo[2*rl + i] = dm >> (i*DM_BITS);
dq_fifo[2*rl + i] = dq >> (i*DQ_BITS);
end
end
endtask
// receiver(s) for data_verify process
dqrx dqrx[DQS_BITS-1:0] (dqs, dq, q0, q1, q2, q3);
// perform data verification as a result of read_verify task call
always @(ck) begin:data_verify
integer i;
integer j;
reg [DQ_BITS-1:0] bit_mask;
reg [DM_BITS-1:0] dm_temp;
reg [DQ_BITS-1:0] dq_temp;
for (i = !ck; (i < 2/(2.0 - !ck)); i=i+1) begin
if (dm_fifo[i] === {DM_BITS{1'bx}}) begin
burst_cntr = 0;
end else begin
dm_temp = dm_fifo[i];
for (j=0; j<DQ_BITS; j=j+1) begin
bit_mask[j] = !dm_temp[j/8];
end
case (burst_cntr)
0: dq_temp = q0;
1: dq_temp = q1;
2: dq_temp = q2;
3: dq_temp = q3;
endcase
//if ( ((dq_temp & bit_mask) === (dq_fifo[i] & bit_mask)))
// $display ("%m at time %t: INFO: Successful read data compare. Expected = %h, Actual = %h, Mask = %h, i = %d", $time, dq_fifo[i], dq_temp, bit_mask, burst_cntr);
if ((dq_temp & bit_mask) !== (dq_fifo[i] & bit_mask))
$display ("%m at time %t: ERROR: Read data miscompare. Expected = %h, Actual = %h, Mask = %h, i = %d", $time, dq_fifo[i], dq_temp, bit_mask, burst_cntr);
burst_cntr = burst_cntr + 1;
end
end
if (ck) begin
if (dm_fifo[2] === {DM_BITS{1'bx}}) begin
dqrx[0%DQS_BITS].ptr <= 0; // v2k syntax
dqrx[1%DQS_BITS].ptr <= 0; // v2k syntax
dqrx[2%DQS_BITS].ptr <= 0; // v2k syntax
dqrx[3%DQS_BITS].ptr <= 0; // v2k syntax
end
end else begin
for (i=0; i<=(2*(AL_MAX+CL_MAX)+BL_MAX); i=i+1) begin
dm_fifo[i] = dm_fifo[i+2];
dq_fifo[i] = dq_fifo[i+2];
end
end
end
// End-of-test triggered in 'subtest.vh'
task test_done;
begin
$display ("%m at time %t: INFO: Simulation is Complete", $time);
$stop(0);
end
endtask
// Test included from external file
`include "subtest.vh"
endmodule
module dqrx (
dqs, dq, q0, q1, q2, q3
);
`include "ddr2_parameters.vh"
input dqs;
input [DQ_BITS/DQS_BITS-1:0] dq;
output [DQ_BITS/DQS_BITS-1:0] q0;
output [DQ_BITS/DQS_BITS-1:0] q1;
output [DQ_BITS/DQS_BITS-1:0] q2;
output [DQ_BITS/DQS_BITS-1:0] q3;
reg [DQ_BITS/DQS_BITS-1:0] q [3:0];
assign q0 = q[0];
assign q1 = q[1];
assign q2 = q[2];
assign q3 = q[3];
reg [1:0] ptr;
reg dqs_q;
always @(dqs) begin
if (dqs ^ dqs_q) begin
#(TDQSQ + 1);
q[ptr] <= dq;
ptr <= (ptr + 1)%4;
end
dqs_q <= dqs;
end
endmodule
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