OK, let me know about the RISE/FALL issue, once y...
# xycee
Eric Keiter
05/13/2021, 7:34 PMOK, let me know about the RISE/FALL issue, once you figure it out.
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Matthew Guthaus
05/13/2021, 8:49 PMI'm not able to figure out why it is missing one of the measure TARGs. It is clearly described and clearly transitions, but it thinks the transition is at time 0.0 which is before the TD value starts. You can replicate with:
Copy code
Xyce sh_stim.spMatthew Guthaus
05/13/2021, 8:50 PMngspice results:
clk2q_delay = 1.336590e-10 targ= 2.013366e-08 trig= 2.000000e-08
setup_hold_time = -7.500000e-09 targ= 1.250000e-08 trig= 2.000000e-08
xyce results:
CLK2Q_DELAY = 1.186285e-10 with trig time= 2.000000e-08 and targ time= 2.011863e-08
Measure Start Time= 1.900000e-08 Measure End Time= 4.000000e-08
SETUP_HOLD_TIME = FAILED with trig time= 2.000000e-08 and targ time= 0.000000e+00
Measure Start Time= 1.200000e-08 Measure End Time= 4.000000e-08
Matthew Guthaus
05/13/2021, 8:51 PMThere are a few model warnings, but they should be ok if ignored.
Matthew Guthaus
05/13/2021, 8:51 PM(We get them with ngspice too)
Matthew Guthaus
05/13/2021, 8:54 PMDoes xyce require that a targ occur after a trig?
Matthew Guthaus
05/13/2021, 9:08 PMI think that is the issue. In other sims, you can measure negative things like setup times that may be negative.
Matthew Guthaus
05/13/2021, 9:08 PMIf I swap the trig and targ it works. But that isn't a solution because I cannot know whether it will have a positive or negative setup time.
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Eric Keiter
05/13/2021, 9:09 PMOK, good to know. I didn’t work on the various MEASURE options myself, so I’ll have to check.
Eric Keiter
05/13/2021, 9:20 PMI’ve reproduced the error that you describe. I’ll probably hand this issue over to the guy who worked on most of the .MEASURE features. But if he doesn’t have time, I’ll dig into it myself.
👍 1
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Matthew Guthaus
05/13/2021, 9:20 PMI'm digging into the code as well. Open source. 🙂
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Eric Keiter
05/13/2021, 9:21 PMCool. 🙂. Most of the MEASURE related code is in this directory: Xyce/src/IOInterfacePKG/Output
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Matthew Guthaus
05/13/2021, 9:28 PMYup, looking at it now
Matthew Guthaus
05/13/2021, 9:36 PMIs there an easy way to build with debug symbols?
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Eric Keiter
05/13/2021, 9:38 PMIf you are building using the autotools, then you need to include the “-g” flag on the CXXFLAGS and CFLAGS line. CXXFLAGS more important.
Eric Keiter
05/13/2021, 9:42 PMSo I might have this for the CXXFLAGS argument: CXXFLAGS=” -std=c++11 -g -O3 ”
Eric Keiter
05/13/2021, 9:42 PMSometimes, it works better with lower optimization levels.
Eric Keiter
05/13/2021, 9:43 PMSo with the updated CXXFLAGS, re-configure, then rebuild from (unfortunately) scratch.
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Matthew Guthaus
05/13/2021, 9:46 PMThe source looks very nice BTW
Matthew Guthaus
05/13/2021, 9:47 PMI think I'm going to be a convert
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Eric Keiter
05/13/2021, 9:47 PMthanks!