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k7ddrphy: write leveling and read calibration support

This commit is contained in:
Sebastien Bourdeauducq 2014-08-31 21:54:28 +08:00
parent 19abe2b888
commit 5483b37c8f
1 changed files with 77 additions and 15 deletions
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92
misoclib/sdramphy/k7ddrphy.py
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@ -2,16 +2,27 @@
from migen.fhdl.std import *
from migen.bus.dfi import *
from migen.bank.description import *
from misoclib import lasmicon
class K7DDRPHY(Module):
class K7DDRPHY(Module, AutoCSR):
def __init__(self, pads, memtype):
a = flen(pads.a)
ba = flen(pads.ba)
d = flen(pads.dq)
nphases = 4
self._r_wlevel_en = CSRStorage()
self._r_wlevel_strobe = CSR()
self._r_dly_sel = CSRStorage(d//8)
self._r_rdly_dq_rst = CSR()
self._r_rdly_dq_inc = CSR()
self._r_wdly_dq_rst = CSR()
self._r_wdly_dq_inc = CSR()
self._r_wdly_dqs_rst = CSR()
self._r_wdly_dqs_inc = CSR()
self.phy_settings = lasmicon.PhySettings(
memtype=memtype,
dfi_d=2*d,
@ -28,6 +39,9 @@ class K7DDRPHY(Module):
self.dfi = Interface(a, ba, self.phy_settings.dfi_d, nphases)
###
# Clock
sd_clk_se = Signal()
self.specials += [
Instance("OSERDESE2",
@ -49,6 +63,7 @@ class K7DDRPHY(Module):
)
]
# Addresses and commands
for i in range(a):
self.specials += \
Instance("OSERDESE2",
@ -98,7 +113,19 @@ class K7DDRPHY(Module):
i_D7=getattr(self.dfi.phases[3], name), i_D8=getattr(self.dfi.phases[3], name)
)
oe = Signal()
# DQS and DM
oe_dqs = Signal()
dqs_serdes_pattern = Signal(8)
self.comb += \
If(self._r_wlevel_en.storage,
If(self._r_wlevel_strobe.re,
dqs_serdes_pattern.eq(0b00000001)
).Else(
dqs_serdes_pattern.eq(0b00000000)
)
).Else(
dqs_serdes_pattern.eq(0b01010101)
)
for i in range(d//8):
dm_o_nodelay = Signal()
self.specials += \
@ -120,10 +147,16 @@ class K7DDRPHY(Module):
Instance("ODELAYE2",
p_DELAY_SRC="ODATAIN", p_SIGNAL_PATTERN="DATA",
p_CINVCTRL_SEL="FALSE", p_HIGH_PERFORMANCE_MODE="TRUE", p_REFCLK_FREQUENCY=200.0,
p_PIPE_SEL="FALSE", p_ODELAY_TYPE="FIXED", p_ODELAY_VALUE=0,
p_PIPE_SEL="FALSE", p_ODELAY_TYPE="VARIABLE", p_ODELAY_VALUE=0,
i_C=ClockSignal(),
i_LD=self._r_dly_sel.storage[i] & self._r_wdly_dq_rst.re,
i_CE=self._r_dly_sel.storage[i] & self._r_wdly_dq_inc.re,
i_LDPIPEEN=0, i_INC=1,
o_ODATAIN=dm_o_nodelay, o_DATAOUT=pads.dm[i]
)
)
dqs_nodelay = Signal()
dqs_delayed = Signal()
dqs_t = Signal()
@ -137,14 +170,21 @@ class K7DDRPHY(Module):
i_OCE=1, i_TCE=1,
i_RST=ResetSignal(),
i_CLK=ClockSignal("sys4x"), i_CLKDIV=ClockSignal(),
i_D1=1, i_D2=0, i_D3=1, i_D4=0,
i_D5=1, i_D6=0, i_D7=1, i_D8=0,
i_T1=~oe
i_D1=dqs_serdes_pattern[0], i_D2=dqs_serdes_pattern[1],
i_D3=dqs_serdes_pattern[2], i_D4=dqs_serdes_pattern[3],
i_D5=dqs_serdes_pattern[4], i_D6=dqs_serdes_pattern[5],
i_D7=dqs_serdes_pattern[6], i_D8=dqs_serdes_pattern[7],
i_T1=~oe_dqs
),
Instance("ODELAYE2",
p_DELAY_SRC="ODATAIN", p_SIGNAL_PATTERN="DATA",
p_CINVCTRL_SEL="FALSE", p_HIGH_PERFORMANCE_MODE="TRUE", p_REFCLK_FREQUENCY=200.0,
p_PIPE_SEL="FALSE", p_ODELAY_TYPE="FIXED", p_ODELAY_VALUE=6,
p_PIPE_SEL="FALSE", p_ODELAY_TYPE="VARIABLE", p_ODELAY_VALUE=6,
i_C=ClockSignal(),
i_LD=self._r_dly_sel.storage[i] & self._r_wdly_dqs_rst.re,
i_CE=self._r_dly_sel.storage[i] & self._r_wdly_dqs_inc.re,
i_LDPIPEEN=0, i_INC=1,
o_ODATAIN=dqs_nodelay, o_DATAOUT=dqs_delayed
),
@ -154,6 +194,8 @@ class K7DDRPHY(Module):
)
]
# DQ
oe_dq = Signal()
for i in range(d):
dq_o_nodelay = Signal()
dq_o_delayed = Signal()
@ -174,7 +216,7 @@ class K7DDRPHY(Module):
i_D3=self.dfi.phases[1].wrdata[i], i_D4=self.dfi.phases[1].wrdata[d+i],
i_D5=self.dfi.phases[2].wrdata[i], i_D6=self.dfi.phases[2].wrdata[d+i],
i_D7=self.dfi.phases[3].wrdata[i], i_D8=self.dfi.phases[3].wrdata[d+i],
i_T1=~oe
i_T1=~oe_dq
),
Instance("ISERDESE2",
p_DATA_WIDTH=8, p_DATA_RATE="DDR",
@ -194,14 +236,24 @@ class K7DDRPHY(Module):
Instance("ODELAYE2",
p_DELAY_SRC="ODATAIN", p_SIGNAL_PATTERN="DATA",
p_CINVCTRL_SEL="FALSE", p_HIGH_PERFORMANCE_MODE="TRUE", p_REFCLK_FREQUENCY=200.0,
p_PIPE_SEL="FALSE", p_ODELAY_TYPE="FIXED", p_ODELAY_VALUE=0,
p_PIPE_SEL="FALSE", p_ODELAY_TYPE="VARIABLE", p_ODELAY_VALUE=0,
i_C=ClockSignal(),
i_LD=self._r_dly_sel.storage[i//8] & self._r_wdly_dq_rst.re,
i_CE=self._r_dly_sel.storage[i//8] & self._r_wdly_dq_inc.re,
i_LDPIPEEN=0, i_INC=1,
o_ODATAIN=dq_o_nodelay, o_DATAOUT=dq_o_delayed
),
Instance("IDELAYE2",
p_DELAY_SRC="IDATAIN", p_SIGNAL_PATTERN="DATA",
p_CINVCTRL_SEL="FALSE", p_HIGH_PERFORMANCE_MODE="TRUE", p_REFCLK_FREQUENCY=200.0,
p_PIPE_SEL="FALSE", p_IDELAY_TYPE="FIXED", p_IDELAY_VALUE=6,
p_PIPE_SEL="FALSE", p_IDELAY_TYPE="VARIABLE", p_IDELAY_VALUE=6,
i_C=ClockSignal(),
i_LD=self._r_dly_sel.storage[i//8] & self._r_rdly_dq_rst.re,
i_CE=self._r_dly_sel.storage[i//8] & self._r_rdly_dq_inc.re,
i_LDPIPEEN=0, i_INC=1,
i_IDATAIN=dq_i_nodelay, o_DATAOUT=dq_i_delayed
),
@ -211,6 +263,8 @@ class K7DDRPHY(Module):
)
]
# Flow control
#
# total read latency = 6:
# 2 cycles through OSERDESE2
# 2 cycles CAS
@ -220,9 +274,17 @@ class K7DDRPHY(Module):
n_rddata_en = Signal()
self.sync += n_rddata_en.eq(rddata_en)
rddata_en = n_rddata_en
self.sync += [phase.rddata_valid.eq(rddata_en) for phase in self.dfi.phases]
self.sync += [phase.rddata_valid.eq(rddata_en | self._r_wlevel_en.storage)
for phase in self.dfi.phases]
last_wrdata_en = Signal(5)
oe = Signal()
last_wrdata_en = Signal(4)
wrphase = self.dfi.phases[self.phy_settings.wrphase]
self.sync += last_wrdata_en.eq(Cat(wrphase.wrdata_en, last_wrdata_en[:4]))
self.comb += oe.eq(last_wrdata_en[2+0] | last_wrdata_en[2+1] | last_wrdata_en[2+2])
self.sync += last_wrdata_en.eq(Cat(wrphase.wrdata_en, last_wrdata_en[:3]))
self.comb += oe.eq(last_wrdata_en[1] | last_wrdata_en[2] | last_wrdata_en[3])
self.sync += \
If(self._r_wlevel_en.storage,
oe_dqs.eq(1), oe_dq.eq(0)
).Else(
oe_dqs.eq(oe), oe_dq.eq(oe)
)