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[enh] ECP5 DIfferential input support

This commit is contained in:
Charles-Henri Mousset 2021-04-05 17:24:51 +02:00
parent 080ecad522
commit 51ea0c0427
1 changed files with 19 additions and 1 deletions
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20
litex/build/lattice/common.py
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@ -5,6 +5,7 @@
# Copyright (c) 2017 William D. Jones <thor0505@comcast.net> # Copyright (c) 2017 William D. Jones <thor0505@comcast.net>
# Copyright (c) 2019 David Shah <dave@ds0.me> # Copyright (c) 2019 David Shah <dave@ds0.me>
# Copyright (c) 2020 David Corrigan <davidcorrigan714@gmail.com> # Copyright (c) 2020 David Corrigan <davidcorrigan714@gmail.com>
# Copyright (c) 2021 Charles-Henri Mousset <ch.mousset@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause # SPDX-License-Identifier: BSD-2-Clause
from migen.fhdl.module import Module from migen.fhdl.module import Module
@ -105,6 +106,21 @@ class LatticeECP5DDROutput:
def lower(dr): def lower(dr):
return LatticeECP5DDROutputImpl(dr.i1, dr.i2, dr.o, dr.clk) return LatticeECP5DDROutputImpl(dr.i1, dr.i2, dr.o, dr.clk)
# ECP5 Differential Input --------------------------------------------------------------------------
class LatticeECP5DifferentialInputImpl(Module):
def __init__(self, i_p, i_n, o):
self.specials += Instance("ILVDS",
i_A=i_p,
i_AN=i_n,
o_Z=o,
)
class LatticeECP5DifferentialInput:
@staticmethod
def lower(dr):
return LatticeECP5DifferentialInputImpl(dr.i_p, dr.i_n, dr.o)
# ECP5 Special Overrides --------------------------------------------------------------------------- # ECP5 Special Overrides ---------------------------------------------------------------------------
lattice_ecp5_special_overrides = { lattice_ecp5_special_overrides = {
@ -113,6 +129,7 @@ lattice_ecp5_special_overrides = {
SDROutput: LatticeECP5SDROutput, SDROutput: LatticeECP5SDROutput,
DDRInput: LatticeECP5DDRInput, DDRInput: LatticeECP5DDRInput,
DDROutput: LatticeECP5DDROutput, DDROutput: LatticeECP5DDROutput,
DifferentialInput: LatticeECP5DifferentialInput,
} }
# ECP5 Trellis Tristate ---------------------------------------------------------------------------- # ECP5 Trellis Tristate ----------------------------------------------------------------------------
@ -142,7 +159,8 @@ lattice_ecp5_trellis_special_overrides = {
SDRInput: LatticeECP5SDRInput, SDRInput: LatticeECP5SDRInput,
SDROutput: LatticeECP5SDROutput, SDROutput: LatticeECP5SDROutput,
DDRInput: LatticeECP5DDRInput, DDRInput: LatticeECP5DDRInput,
DDROutput: LatticeECP5DDROutput DDROutput: LatticeECP5DDROutput,
DifferentialInput: LatticeECP5DifferentialInput,
} }