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Change step resolution in setup_hold to 5p to avoid convergence problems with ngspice.

This commit is contained in:
Matt Guthaus 2016-11-10 11:07:52 -08:00
parent 868f97caaa
commit 992d091a8b
1 changed files with 3 additions and 2 deletions
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5
compiler/characterizer/setup_hold.py
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@ -165,7 +165,7 @@ class setup_hold():
def write_control(self, period): def write_control(self, period):
# transient window # transient window
end_time = 2 * period end_time = 2 * period
self.sf.write(".TRAN 1n {0}n\n".format(end_time)) self.sf.write(".TRAN 5p {0}n\n".format(end_time))
self.sf.write(".OPTIONS POST=1 PROBE\n") self.sf.write(".OPTIONS POST=1 PROBE\n")
if OPTS.spice_version == "hspice": if OPTS.spice_version == "hspice":
@ -175,6 +175,7 @@ class setup_hold():
else: else:
self.sf.write(".control\n") self.sf.write(".control\n")
self.sf.write("run\n") self.sf.write("run\n")
self.sf.write("* plot clk_buf data_buf doutrun\n")
self.sf.write("quit\n") self.sf.write("quit\n")
self.sf.write(".endc\n") self.sf.write(".endc\n")
self.sf.write(".end\n") self.sf.write(".end\n")
@ -278,7 +279,7 @@ class setup_hold():
else: else:
setuphold_time = period - target_time setuphold_time = period - target_time
debug.info(2,"Converged on {0} time {1}, data at {1}, clock at {2}. ".format(mode,setuphold_time,target_time,period)) debug.info(2,"Converged on {0} time {1}, data at {2}, clock at {3}.".format(mode,setuphold_time,target_time,period))
return setuphold_time return setuphold_time