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targets/kcu105: simplify CRG using USIDELAYCTRL.

This commit is contained in:
Florent Kermarrec 2020-03-10 16:48:07 +01:00
parent 3c0b97eec8
commit c97fabb285
1 changed files with 5 additions and 31 deletions
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34
litex/boards/targets/kcu105.py
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@ -26,7 +26,6 @@ class _CRG(Module):
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
self.clock_domains.cd_clk200 = ClockDomain()
self.clock_domains.cd_ic = ClockDomain()
# # #
@ -46,33 +45,7 @@ class _CRG(Module):
AsyncResetSynchronizer(self.cd_clk200, ~pll.locked),
]
ic_reset_counter = Signal(max=64, reset=63)
ic_reset = Signal(reset=1)
self.sync.clk200 += \
If(ic_reset_counter != 0,
ic_reset_counter.eq(ic_reset_counter - 1)
).Else(
ic_reset.eq(0)
)
ic_rdy = Signal()
ic_rdy_counter = Signal(max=64, reset=63)
self.cd_sys.rst.reset = 1
self.comb += self.cd_ic.clk.eq(self.cd_sys.clk)
self.sync.ic += [
If(ic_rdy,
If(ic_rdy_counter != 0,
ic_rdy_counter.eq(ic_rdy_counter - 1)
).Else(
self.cd_sys.rst.eq(0)
)
)
]
self.specials += [
Instance("IDELAYCTRL", p_SIM_DEVICE="ULTRASCALE",
i_REFCLK=ClockSignal("clk200"), i_RST=ic_reset,
o_RDY=ic_rdy),
AsyncResetSynchronizer(self.cd_ic, ic_reset)
]
self.submodules.idelayctrl = USIDELAYCTRL(cd_ref=self.cd_clk200, cd_sys=self.cd_sys)
# BaseSoC ------------------------------------------------------------------------------------------
@ -90,10 +63,11 @@ class BaseSoC(SoCSDRAM):
if not self.integrated_main_ram_size:
self.submodules.ddrphy = usddrphy.USDDRPHY(platform.request("ddram"),
memtype = "DDR4",
sys_clk_freq = sys_clk_freq)
sys_clk_freq = sys_clk_freq,
iodelay_clk_freq = 200e6,
cmd_latency = 0)
self.add_csr("ddrphy")
self.add_constant("USDDRPHY", None)
self.add_constant("USDDRPHY_DEBUG", None)
sdram_module = EDY4016A(sys_clk_freq, "1:4")
self.register_sdram(self.ddrphy,
geom_settings = sdram_module.geom_settings,