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artiq
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targets/ARTIQMiniSoC: 125MHz RTIO clocking

This commit is contained in:
Sebastien Bourdeauducq 2014-11-30 01:00:27 +08:00
parent 9aafe89518
commit 39c4b5416f
1 changed files with 20 additions and 3 deletions
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23
soc/targets/artiq.py
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@ -39,6 +39,24 @@ class _TestGen(Module):
self.comb += pad.eq(sr[0])
class _RTIOMiniCRG(Module):
def __init__(self, platform):
self.clock_domains.cd_rtio = ClockDomain()
# 80MHz -> 125MHz
self.specials += Instance("DCM_CLKGEN",
p_CLKFXDV_DIVIDE=2, p_CLKFX_DIVIDE=16, p_CLKFX_MD_MAX=1.6, p_CLKFX_MULTIPLY=25,
p_CLKIN_PERIOD=12.5, p_SPREAD_SPECTRUM="NONE", p_STARTUP_WAIT="FALSE",
i_CLKIN=ClockSignal(), o_CLKFX=self.cd_rtio.clk,
i_FREEZEDCM=0, i_RST=ResetSignal())
platform.add_platform_command("""
NET "{rtio_clk}" TNM_NET = "GRPrtio_clk";
NET "sys_clk" TNM_NET = "GRPsys_clk";
TIMESPEC "TSfix_ise1" = FROM "GRPrtio_clk" TO "GRPsys_clk" TIG;
TIMESPEC "TSfix_ise2" = FROM "GRPsys_clk" TO "GRPrtio_clk" TIG;
""", rtio_clk=self.cd_rtio.clk)
class ARTIQMiniSoC(BaseSoC):
csr_map = {
"rtio": 13
@ -60,12 +78,11 @@ class ARTIQMiniSoC(BaseSoC):
rtio_pads = [platform.request("ttl", i) for i in range(4)]
fud = Signal()
rtio_pads.append(fud)
self.submodules.rtiocrg = _RTIOMiniCRG(platform)
self.submodules.rtiophy = rtio.phy.SimplePHY(
rtio_pads,
output_only_pads={rtio_pads[1], rtio_pads[2], rtio_pads[3], fud})
self.submodules.rtio = rtio.RTIO(self.rtiophy, self.clk_freq)
self.clock_domains.cd_rtio = ClockDomain()
self.comb += self.cd_rtio.clk.eq(ClockSignal())
self.submodules.rtio = rtio.RTIO(self.rtiophy, 125000000)
if with_test_gen:
self.submodules.test_gen = _TestGen(platform.request("ttl", 4))