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trellis: Add LPF frequency constraints and remove -nomux

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This commit is contained in:
David Shah 2019-02-25 18:01:35 +00:00
parent 5f29a12ee7
commit 024b41c5b2
1 changed files with 2 additions and 7 deletions
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9
litex/build/lattice/trellis.py
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@ -125,7 +125,7 @@ class LatticeTrellisToolchain:
self.yosys_template = [
"{read_files}",
"attrmap -tocase keep -imap keep=\"true\" keep=1 -imap keep=\"false\" keep=0 -remove keep=0",
"synth_ecp5 -nomux -json {build_name}.json -top {build_name}",
"synth_ecp5 -json {build_name}.json -top {build_name}",
]
self.build_template = [
@ -189,9 +189,4 @@ class LatticeTrellisToolchain:
# approach as the icestorm and use the fastest clock for timing
# constraints.
def add_period_constraint(self, platform, clk, period):
new_freq = 1000.0/period
if clk not in self.freq_constraints.keys():
self.freq_constraints[clk] = new_freq
else:
raise ConstraintError("Period constraint already added to signal.")
platform.add_platform_command("""FREQUENCY PORT "{clk}" {freq} MHz;""".format(freq=str(float(1/period)*1000), clk="{clk}"), clk=clk)