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phy/kusddrphy: revert delays control and add comments for initial delays values

This commit is contained in:
Florent Kermarrec 2017-07-08 10:54:02 +02:00
parent aad2f92b33
commit 99fe71d622
1 changed files with 28 additions and 22 deletions
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42
litedram/phy/kusddrphy.py
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@ -10,7 +10,7 @@ from litedram.common import PhySettings
from litedram.phy.dfi import *
# TODO:
# - revert IDELAYE3/ODELAYE3 taps control
# - test on hardware
class KUSDDRPHY(Module, AutoCSR):
def __init__(self, pads):
@ -146,12 +146,12 @@ class KUSDDRPHY(Module, AutoCSR):
Instance("ODELAYE3",
p_CASCADE="NONE", p_UPDATE_MODE="ASYNC", p_REFCLK_FREQUENCY=200.0,
p_IS_CLK_INVERTED=0, p_IS_RST_INVERTED=0,
p_DELAY_FORMAT="TIME", p_DELAY_TYPE="FIXED", p_DELAY_VALUE=0,
p_DELAY_FORMAT="COUNT", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal(),
i_INC=0, i_EN_VTC=1,
i_RST=0,
i_CE=0,
i_INC=1, i_EN_VTC=0,
i_RST=self._dly_sel.storage[i] & self._wdly_dq_rst.re,
i_CE=self._dly_sel.storage[i] & self._wdly_dq_inc.re,
o_ODATAIN=dm_o_nodelay, o_DATAOUT=pads.dm[i]
)
@ -176,12 +176,15 @@ class KUSDDRPHY(Module, AutoCSR):
Instance("ODELAYE3",
p_CASCADE="NONE", p_UPDATE_MODE="ASYNC", p_REFCLK_FREQUENCY=200.0,
p_IS_CLK_INVERTED=0, p_IS_RST_INVERTED=0,
p_DELAY_FORMAT="TIME", p_DELAY_TYPE="FIXED", p_DELAY_VALUE=500,
# we should preconfigure delay to 500ps with tCK=5ns but since tap
# size can vary between 2.5 to 15 ps across PVT, set initial delay
# to 0 and let the software configure it.
p_DELAY_FORMAT="COUNT", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal(),
i_INC=0, i_EN_VTC=1,
i_RST=0,
i_CE=0,
i_INC=1, i_EN_VTC=0,
i_RST=self._dly_sel.storage[i] & self._wdly_dqs_rst.re,
i_CE=self._dly_sel.storage[i] & self._wdly_dqs_inc.re,
o_ODATAIN=dqs_nodelay, o_DATAOUT=dqs_delayed
),
@ -231,25 +234,28 @@ class KUSDDRPHY(Module, AutoCSR):
Instance("ODELAYE3",
p_CASCADE="NONE", p_UPDATE_MODE="ASYNC", p_REFCLK_FREQUENCY=200.0,
p_IS_CLK_INVERTED=0, p_IS_RST_INVERTED=0,
p_DELAY_FORMAT="TIME", p_DELAY_TYPE="FIXED", p_DELAY_VALUE=0,
p_DELAY_FORMAT="COUNT", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal(),
i_INC=0, i_EN_VTC=1,
i_RST=0,
i_CE=0,
i_INC=1, i_EN_VTC=0,
i_RST=self._dly_sel.storage[i//8] & self._wdly_dq_rst.re,
i_CE=self._dly_sel.storage[i//8] & self._wdly_dq_inc.re,
o_ODATAIN=dq_o_nodelay, o_DATAOUT=dq_o_delayed
),
Instance("IDELAYE3",
p_CASCADE="NONE", p_UPDATE_MODE="ASYNC",p_REFCLK_FREQUENCY=200.0,
p_IS_CLK_INVERTED=0, p_IS_RST_INVERTED=0,
p_DELAY_FORMAT="TIME", p_DELAY_SRC="IDATAIN",
p_DELAY_TYPE="FIXED", p_DELAY_VALUE=0,
p_DELAY_FORMAT="COUNT", p_DELAY_SRC="IDATAIN",
# we should preconfigure delay to 500ps with tCK=5ns but since tap
# size can vary between 2.5 to 15 ps across PVT, set initial delay
# to 0 and let the software configure it.
p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal(),
i_INC=0, i_EN_VTC=1,
i_RST=0,
i_CE=0,
i_INC=1, i_EN_VTC=0,
i_RST=self._dly_sel.storage[i//8] & self._rdly_dq_rst.re,
i_CE=self._dly_sel.storage[i//8] & self._rdly_dq_inc.re,
i_IDATAIN=dq_i_nodelay, o_DATAOUT=dq_i_delayed
),