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prod/doc/: added scope screen shots to analysis; show crystal as alt GND for clk

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This commit is contained in:
Werner Almesberger
2011-05-27 18:37:40 -03:00
parent 717f7e77a3
commit c93f6d945e
6 changed files with 22 additions and 8 deletions
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21
prod/doc/analysis.hmac
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@@ -24,6 +24,8 @@
<SECTION ref="orientation" title="Component orientation">
@@@
<!-- ====================================================================== -->
@@ -42,7 +44,7 @@ On <B>atusb</B>, there is also the USB voltage domain at nominally 5.0 V.
<P>
Voltages should be tested in the following order: USB, then I/O, then
digital, and finally analog. The table below gives the permissible
ranges. Any voltages outside of these ranges indicate a problem.
ranges. Any voltages outside these ranges indicate a problem.
<P>
<TABLE frame="border" cellpadding="2">
<TR><TH>Domain<TH>Nominal<TH>Minimum<TH>Maximum
@@ -51,7 +53,6 @@ ranges. Any voltages outside of these ranges indicate a problem.
<TR><TD>Digital<TD>1.8 V<TD>1.7 V<TD>1.9 V
<TR><TD>Analog<TD>1.8 V<TD>1.7 V<TD>1.9 V
</TABLE>
<P>
<!-- ---------------------------------------------------------------------- -->
@@ -170,9 +171,13 @@ atrf-txrx -d net:ben -C 1
This configures <B>atben</B> as a promiscuous receiver. The reception
of any IEEE 802.15.4 frame or pressing Ctrl-C will terminate the command.
<P>
The clock signal (CLKM) is available on the test pad shown here:
The clock signal (CLKM) is available on the test pad shown on the image
on the left, and it should look roughly as shown in the screen shot on
the right:
<P>
<A href="atben-A.png"><IMG src="atben-A-small.png"></A>
<A href="atben-A.png"><IMG src="atben-A-small.png" align="left"></A>
&nbsp;
<IMG src="atben-clkm.png">
<P>
<TABLE frame="border" cellpadding="2">
<TR><TH align="left">Clock<TH align="left">Action
@@ -201,6 +206,14 @@ either as the direct output from the transceiver (CLKM) or after passing
a low-pass filter (CLK):
<P>
<A href="atusb-A.png"><IMG src="atusb-A-small.png"></A>
&nbsp;
<IMG src="atusb-clkm.png">
&nbsp;
<IMG src="atusb-clk.png">
<P>
The left screen shot shows the clock (CLKM) before the low-pass filter
while the right screen shows the clock (CLK) after the the low-pass
filter.
<P>
<TABLE frame="border" cellpadding="2">
<TR><TH align="left">Clock<TH align="left">Action