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suservo: clkout and sdo[b-d] are inverted

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This commit is contained in:
Robert Jördens 2018-05-11 16:15:18 +00:00
parent 04240cdc08
commit 74c0b4452b
1 changed files with 16 additions and 10 deletions
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26
artiq/gateware/suservo/pads.py
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@ -16,20 +16,23 @@ class SamplerPads(Module):
dn = platform.request("{}_adc_data_n".format(eem))
clkout_se = Signal()
clkout_inv = Signal()
sck = Signal()
self.specials += [
DifferentialOutput(self.cnv, cnv.p, cnv.n),
DifferentialOutput(1, sdr.p, sdr.n),
DDROutput(0, self.sck_en, sck, ClockSignal("rio_phy")),
DDROutput(self.sck_en, 0, sck, ClockSignal("rio_phy")),
DifferentialOutput(sck, spip.clk, spin.clk),
DifferentialInput(dp.clkout, dn.clkout, clkout_se),
Instance("BUFR", i_I=clkout_se, o_O=self.clkout)
# FIXME (hardware): CLKOUT is inverted
# (Sampler v2.0, v2.1) out on rising, in on falling
Instance("BUFR", i_I=clkout_se, o_O=clkout_inv)
]
self.comb += self.clkout.eq(~clkout_inv)
# here to be early before the input delays below to have the clock
# available
self.clkout_p = dp.clkout # availabel for false paths
# define clock here before the input delays below
self.clkout_p = dp.clkout # available for false paths
platform.add_platform_command(
"create_clock -name {clk} -period 8 [get_nets {clk}]",
clk=dp.clkout)
@ -37,17 +40,20 @@ class SamplerPads(Module):
for i in "abcd":
sdo = Signal()
setattr(self, "sdo{}".format(i), sdo)
if i != "a":
# FIXME (hardware): sdob, sdoc, sdod are inverted
# (Sampler v2.0, v2.1)
sdo, sdo_inv = Signal(), sdo
self.comb += sdo_inv.eq(~sdo)
sdop = getattr(dp, "sdo{}".format(i))
sdon = getattr(dn, "sdo{}".format(i))
self.specials += [
DifferentialInput(sdop, sdon, sdo),
]
# 8, -0+1.5 hold (t_HSDO_DDR), -0.5+0.5 skew
# -0+1.5 hold (t_HSDO_SDR), -0.5+0.5 skew
platform.add_platform_command(
"set_input_delay -clock {clk} "
"-max 2 [get_ports {port}] -clock_fall\n"
"set_input_delay -clock {clk} "
"-min -0.5 [get_ports {port}] -clock_fall",
"set_input_delay -clock {clk} -max 2 [get_ports {port}]\n"
"set_input_delay -clock {clk} -min -0.5 [get_ports {port}]",
clk=dp.clkout, port=sdop)