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platforms/mercury_xu5: fix sdram timing issues

This commit is contained in:
Jędrzej Boczar 2020-03-10 14:38:15 +01:00
parent 95e1a05bf1
commit 90de99eb46
2 changed files with 32 additions and 81 deletions
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97
litex_boards/platforms/mercury_xu5.py
View File

@ -36,89 +36,40 @@ _io = [
IOStandard("LVCMOS33"),
),
("ddram", 0, # TODO: remove Misc with default settings
("i2c", 0,
Subsignal("scl", Pins("D12")),
Subsignal("sda", Pins("C12")),
IOStandard("LVCMOS18")
),
("ddram", 0,
Subsignal("a", Pins(
"AC4 AC3 AB4 AB3 AB2 AC2 AB1 AC1",
"AB5 AG4 AH4 AG3 AH3 AE3"), IOStandard("SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("we_n", Pins("AF3"), IOStandard("SSTL12_DCI"), # A14
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("cas_n", Pins("AE2"), IOStandard("SSTL12_DCI"), # A15
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("ras_n", Pins("AF2"), IOStandard("SSTL12_DCI"), # A16
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("ba", Pins("AH1 AF1"), IOStandard("SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
# Subsignal("bg", Pins("AG1 AD9"), IOStandard("SSTL12_DCI"),
Subsignal("bg", Pins("AG1"), IOStandard("SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("cs_n", Pins("AH9"), IOStandard("SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=SDR"),
),
Subsignal("act_n", Pins("AH2"), IOStandard("SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("dm", Pins("AC9 AG9"), IOStandard("POD12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
# Misc("EQUALIZATION=EQ_LEVEL2"),
Misc("DATA_RATE=DDR"),
),
"AB5 AG4 AH4 AG3 AH3 AE3"), IOStandard("SSTL12_DCI")),
Subsignal("we_n", Pins("AF3"), IOStandard("SSTL12_DCI")), # A14
Subsignal("cas_n", Pins("AE2"), IOStandard("SSTL12_DCI")), # A15
Subsignal("ras_n", Pins("AF2"), IOStandard("SSTL12_DCI")), # A16
Subsignal("ba", Pins("AH1 AF1"), IOStandard("SSTL12_DCI")),
Subsignal("bg", Pins("AG1"), IOStandard("SSTL12_DCI")),
Subsignal("cs_n", Pins("AH9"), IOStandard("SSTL12_DCI")),
Subsignal("act_n", Pins("AH2"), IOStandard("SSTL12_DCI")),
Subsignal("dm", Pins("AC9 AG9"), IOStandard("POD12_DCI")),
Subsignal("dq", Pins(
"AB6 AC6 AE9 AE8 AB8 AC8 AB7 AC7",
"AE5 AF5 AF8 AG8 AH8 AH7 AF7 AF6"), IOStandard("POD12_DCI"),
Misc("PRE_EMPHASIS=RDRV_240"),
Misc("EQUALIZATION=EQ_LEVEL2"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
Misc("ODT=RTT_40"),
),
Misc("EQUALIZATION=EQ_LEVEL2")),
Subsignal("dqs_p", Pins("AD7 AG6"), IOStandard("DIFF_POD12_DCI"),
Misc("PRE_EMPHASIS=RDRV_240"),
Misc("EQUALIZATION=EQ_LEVEL2"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
Misc("ODT=RTT_40"),
),
Misc("EQUALIZATION=EQ_LEVEL2")),
Subsignal("dqs_n", Pins("AE7 AG5"), IOStandard("DIFF_POD12_DCI"),
Misc("PRE_EMPHASIS=RDRV_240"),
Misc("EQUALIZATION=EQ_LEVEL2"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
Misc("ODT=RTT_40"),
),
Subsignal("clk_p", Pins("AD2"), IOStandard("DIFF_SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("clk_n", Pins("AD1"), IOStandard("DIFF_SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("cke", Pins("AH6"), IOStandard("SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("odt", Pins("AE4"), IOStandard("SSTL12_DCI"),
Misc("OUTPUT_IMPEDANCE=RDRV_40_40"),
Misc("DATA_RATE=DDR"),
),
Subsignal("reset_n", Pins("G4"), IOStandard("LVCMOS18"),
Misc("DRIVE=8"),
),
Misc("EQUALIZATION=EQ_LEVEL2")),
Subsignal("clk_p", Pins("AD2"), IOStandard("DIFF_SSTL12_DCI")),
Subsignal("clk_n", Pins("AD1"), IOStandard("DIFF_SSTL12_DCI")),
Subsignal("cke", Pins("AH6"), IOStandard("SSTL12_DCI")),
Subsignal("odt", Pins("AE4"), IOStandard("SSTL12_DCI")),
Subsignal("reset_n", Pins("G4"), IOStandard("LVCMOS18")),
Misc("SLEW=FAST"),
),
]

16
litex_boards/targets/mercury_xu5.py
View File

@ -24,14 +24,14 @@ class _CRG(Module):
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
self.clock_domains.cd_pll4x = ClockDomain(reset_less=True)
self.clock_domains.cd_clk400 = ClockDomain()
self.clock_domains.cd_clk200 = ClockDomain()
self.clock_domains.cd_ic = ClockDomain()
self.submodules.pll = pll = USMMCM(speedgrade=-1)
pll.register_clkin(platform.request("clk100"), 100e6)
pll.create_clkout(self.cd_pll4x, sys_clk_freq*4, buf=None, with_reset=False)
pll.create_clkout(self.cd_clk400, 400e6, with_reset=False)
pll.create_clkout(self.cd_clk200, 200e6, with_reset=False)
self.specials += [
Instance("BUFGCE_DIV", name="main_bufgce_div",
@ -39,12 +39,12 @@ class _CRG(Module):
i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys.clk),
Instance("BUFGCE", name="main_bufgce",
i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys4x.clk),
AsyncResetSynchronizer(self.cd_clk400, ~pll.locked),
AsyncResetSynchronizer(self.cd_clk200, ~pll.locked),
]
ic_reset_counter = Signal(max=64, reset=63)
ic_reset = Signal(reset=1)
self.sync.clk400 += \
self.sync.clk200 += \
If(ic_reset_counter != 0,
ic_reset_counter.eq(ic_reset_counter - 1)
).Else(
@ -65,7 +65,7 @@ class _CRG(Module):
]
self.specials += [
Instance("IDELAYCTRL", p_SIM_DEVICE="ULTRASCALE",
i_REFCLK=ClockSignal("clk400"), i_RST=ic_reset,
i_REFCLK=ClockSignal("clk200"), i_RST=ic_reset,
o_RDY=ic_rdy),
AsyncResetSynchronizer(self.cd_ic, ic_reset)
]
@ -73,7 +73,7 @@ class _CRG(Module):
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCSDRAM):
def __init__(self, sys_clk_freq=int(100e6), **kwargs):
def __init__(self, sys_clk_freq=int(125e6), **kwargs):
platform = mercury_xu5.Platform()
# SoCSDRAM ---------------------------------------------------------------------------------
@ -87,8 +87,8 @@ class BaseSoC(SoCSDRAM):
self.submodules.ddrphy = usddrphy.USDDRPHY(platform.request("ddram"),
memtype = "DDR4",
sim_device = "ULTRASCALE_PLUS",
iodelay_clk_freq = 400e6,
cmd_latency = 1,
iodelay_clk_freq = 200e6,
cmd_latency = 0,
sys_clk_freq = sys_clk_freq)
self.add_csr("ddrphy")
self.add_constant("USDDRPHY", None)