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pipistrello: run at 83+1/3 MHz, cleanup CRG

This commit is contained in:
Robert Jördens 2015-06-22 19:03:00 -06:00
parent 9f3f9255a2
commit cd249b2f66
1 changed files with 8 additions and 6 deletions
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14
soc/targets/artiq_pipistrello.py
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@ -1,3 +1,5 @@
from fractions import Fraction
from migen.fhdl.std import *
from migen.bank.description import *
from migen.bank import wbgen
@ -13,18 +15,18 @@ from artiq.gateware.rtio.phy import ttl_simple, dds
class _RTIOCRG(Module, AutoCSR):
def __init__(self, platform):
def __init__(self, platform, clk_freq):
self._clock_sel = CSRStorage()
self.clock_domains.cd_rtio = ClockDomain(reset_less=True)
# 75MHz -> 125MHz
f = Fraction(125*1000*1000, clk_freq)
rtio_internal_clk = Signal()
self.specials += Instance("DCM_CLKGEN",
p_CLKFXDV_DIVIDE=2,
p_CLKFX_DIVIDE=3,
p_CLKFX_DIVIDE=f.denominator,
p_CLKFX_MD_MAX=1.6,
p_CLKFX_MULTIPLY=5,
p_CLKIN_PERIOD=1e3/75,
p_CLKFX_MULTIPLY=f.numerator,
p_CLKIN_PERIOD=1e9/clk_freq,
p_SPREAD_SPECTRUM="NONE",
p_STARTUP_WAIT="FALSE",
i_CLKIN=ClockSignal(),
@ -123,7 +125,7 @@ trce -v 12 -fastpaths -tsi {build_name}.tsi -o {build_name}.twr {build_name}.ncd
ififo_depth=4))
# RTIO core
self.submodules.rtio_crg = _RTIOCRG(platform)
self.submodules.rtio_crg = _RTIOCRG(platform, self.clk_freq)
self.submodules.rtio = rtio.RTIO(rtio_channels,
clk_freq=125000000)
self.add_constant("RTIO_FINE_TS_WIDTH", self.rtio.fine_ts_width)