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This commit is contained in:
Matt Guthaus 2016-11-10 08:55:11 -08:00
parent e017f3f4ca
commit 46fceba692
1 changed files with 11 additions and 8 deletions
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19
compiler/characterizer/setup_hold.py
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@ -186,9 +186,11 @@ class setup_hold():
depending on whether we are doing setup or hold.
"""
period = tech.spice["feasible_period"]
debug.info(2,"Feasible period from technology file: {0} ".format(period))
# The clock will start being offset by a period, so we want to look before and after
# theis time.
# this time by half a period.
if mode == "HOLD":
target_time = 1.5 * period
lower_bound = 0.5*period
@ -199,8 +201,6 @@ class setup_hold():
upper_bound = 1.5*period
previous_time = target_time
debug.info(2,"Checking initial setup/hold time: {0} ".format(target_time))
# Initial Check if reference setup time passes for correct_value
self.write_stimulus(mode=mode,
target_time=target_time,
@ -214,6 +214,8 @@ class setup_hold():
setuphold_time = target_time - period
else:
setuphold_time = period - target_time
debug.info(2,"Checked initial {0} time {1}, data at {2}, clock at {3} ".format(mode,setuphold_time,
target_time,period))
debug.info(3,"Target time: {0} Low: {1} Up: {2} Measured: {3}".format(target_time,
lower_bound,
upper_bound,
@ -222,9 +224,10 @@ class setup_hold():
debug.error("Initial period/target hold time fails for data value",2)
# We already found it feasible, so advance one step first thing.
debug.info(2,"Performing bidir search on setup/hold time: {2} LB: {0} UB: {1} ".format(lower_bound,
upper_bound,
setuphold_time))
debug.info(2,"Performing bidir search on {3} time: {2} LB: {0} UB: {1} ".format(lower_bound,
upper_bound,
setuphold_time,
mode))
if mode == "HOLD":
target_time -= 0.5 * (upper_bound - lower_bound)
else:
@ -275,7 +278,7 @@ class setup_hold():
else:
setuphold_time = period - target_time
debug.info(2,"Converged on setup/hold time: {0} ".format(setuphold_time))
debug.info(2,"Converged on {0} time {1}, data at {1}, clock at {2}. ".format(mode,setuphold_time,target_time,period))
return setuphold_time