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phy/kusddrphy: operate delays in time mode (to be able to specify 500ps delay on dqs) and add workaround to allow software to get number of taps for 500ps at init.

This commit is contained in:
Florent Kermarrec 2018-03-07 16:23:27 +01:00
parent 459060ede3
commit b885f582f3
1 changed files with 7 additions and 5 deletions
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12
litedram/phy/kusddrphy.py
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@ -17,7 +17,7 @@ class KUSDDRPHY(Module, AutoCSR):
databits = len(pads.dq)
nphases = 4
self._en_vtc = CSRStorage()
self._en_vtc = CSRStorage(reset=1)
self._wlevel_en = CSRStorage()
self._wlevel_strobe = CSR()
@ -32,6 +32,7 @@ class KUSDDRPHY(Module, AutoCSR):
self._wdly_dq_inc = CSR()
self._wdly_dqs_rst = CSR()
self._wdly_dqs_inc = CSR()
self._wdly_dqs_taps = CSRStatus(9)
self.settings = PhySettings(
memtype="DDR3",
@ -146,7 +147,7 @@ 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="COUNT", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
p_DELAY_FORMAT="TIME", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal(),
i_INC=1, i_EN_VTC=self._en_vtc.storage,
@ -176,12 +177,13 @@ 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="COUNT", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=64,
p_DELAY_FORMAT="TIME", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=500,
i_CLK=ClockSignal(),
i_INC=1, i_EN_VTC=self._en_vtc.storage,
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_CNTVALUEOUT=self._wdly_dqs_taps.status if i == 0 else Signal(9),
i_ODATAIN=dqs_nodelay, o_DATAOUT=dqs_delayed
),
@ -239,7 +241,7 @@ 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="COUNT", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
p_DELAY_FORMAT="TIME", p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal(),
i_INC=1, i_EN_VTC=self._en_vtc.storage,
@ -251,7 +253,7 @@ class KUSDDRPHY(Module, AutoCSR):
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="COUNT", p_DELAY_SRC="IDATAIN",
p_DELAY_FORMAT="TIME", p_DELAY_SRC="IDATAIN",
p_DELAY_TYPE="VARIABLE", p_DELAY_VALUE=0,
i_CLK=ClockSignal(),