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phy/ecp5rgmii: Fix io delay blocks 

For correct io delays in nextpnr the DEL_VALUE parameter needs to
be an integer, instead of the "DELAY{}" string.

The use of a "DELAY{}" string appears in the Lattice primitive
manual, but appears to be incorrect. At least based of the current
nextpnr.

Because we are not making use of dynamic io delays here we can
also use the simpler DELAYG block instead of DELAYF.

Fixes #50
This commit is contained in:
Greg Davill 2020-10-11 15:16:58 +10:30
parent 54acf9fd76
commit 6ee11edb87
1 changed files with 10 additions and 25 deletions
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35
liteeth/phy/ecp5rgmii.py
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@ -31,12 +31,9 @@ class LiteEthPHYRGMIITX(Module):
i1 = sink.valid,
i2 = sink.valid,
o = tx_ctl_oddrx1f),
Instance("DELAYF",
Instance("DELAYG",
p_DEL_MODE = "SCLK_ALIGNED",
p_DEL_VALUE = "DELAY0",
i_LOADN = 1,
i_MOVE = 0,
i_DIRECTION = 0,
p_DEL_VALUE = 0,
i_A = tx_ctl_oddrx1f,
o_Z = pads.tx_ctl)
]
@ -47,12 +44,9 @@ class LiteEthPHYRGMIITX(Module):
i1 = sink.data[i],
i2 = sink.data[4+i],
o = tx_data_oddrx1f[i]),
Instance("DELAYF",
Instance("DELAYG",
p_DEL_MODE = "SCLK_ALIGNED",
p_DEL_VALUE = "DELAY0",
i_LOADN = 1,
i_MOVE = 0,
i_DIRECTION = 0,
p_DEL_VALUE = 0,
i_A = tx_data_oddrx1f[i],
o_Z = pads.tx_data[i]
)
@ -94,12 +88,9 @@ class LiteEthPHYRGMIIRX(Module, AutoCSR):
rx_data_reg = Signal(8)
self.specials += [
Instance("DELAYF",
Instance("DELAYG",
p_DEL_MODE = "SCLK_ALIGNED",
p_DEL_VALUE = "DELAY{}".format(rx_delay_taps),
i_LOADN = 1,
i_MOVE = 0,
i_DIRECTION = 0,
p_DEL_VALUE = rx_delay_taps,
i_A = pads.rx_ctl,
o_Z = rx_ctl_delayf),
DDRInput(
@ -112,12 +103,9 @@ class LiteEthPHYRGMIIRX(Module, AutoCSR):
self.sync += rx_ctl_reg.eq(rx_ctl)
for i in range(4):
self.specials += [
Instance("DELAYF",
Instance("DELAYG",
p_DEL_MODE = "SCLK_ALIGNED",
p_DEL_VALUE = "DELAY{}".format(rx_delay_taps),
i_LOADN = 1,
i_MOVE = 0,
i_DIRECTION = 0,
p_DEL_VALUE = rx_delay_taps,
i_A = pads.rx_data[i],
o_Z = rx_data_delayf[i]),
DDRInput(
@ -175,12 +163,9 @@ class LiteEthPHYRGMIICRG(Module, AutoCSR):
i1 = 1,
i2 = 0,
o = eth_tx_clk_o),
Instance("DELAYF",
Instance("DELAYG",
p_DEL_MODE = "SCLK_ALIGNED",
p_DEL_VALUE = "DELAY{}".format(tx_delay_taps),
i_LOADN = 1,
i_MOVE = 0,
i_DIRECTION = 0,
p_DEL_VALUE = tx_delay_taps,
i_A = eth_tx_clk_o,
o_Z = clock_pads.tx)
]