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build/efinix/common: DifferentialInput support

This commit is contained in:
Gwenhael Goavec-Merou 2023-10-02 17:32:49 +02:00
parent 73a28d2c04
commit 728afdd758
1 changed files with 56 additions and 1 deletions
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57
litex/build/efinix/common.py
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@ -10,6 +10,7 @@ from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.build.io import *
from litex.build.generic_platform import Pins
from litex.build.efinix.efinity import EfinityToolchain
# Colorama -----------------------------------------------------------------------------------------
@ -178,7 +179,7 @@ class EfinixDifferentialOutputImpl(Module):
self.comb += i_data.eq(i)
block = {
"type" : "LVDS",
"mode" : "INPUT",
"mode" : "OUTPUT",
"tx_mode" : "DATA",
"name" : io_name,
"sig" : i_data,
@ -195,6 +196,59 @@ class EfinixDifferentialOutput:
def lower(dr):
return EfinixDifferentialOutputImpl(dr.platform, dr.i, dr.o_p, dr.o_n)
# Efinix DifferentialInput -------------------------------------------------------------------------
class EfinixDifferentialInputImpl(Module):
def __init__(self, platform, i_p, i_n, o):
# only keep _p
io_name = platform.get_pin_name(i_p)
io_pad = platform.get_pad_name(i_p) # need real pad name
io_prop = platform.get_pin_properties(i_p)
# _p has _P_ and _n has _N_ followed by an optional function
# lvds block needs _PN_
pad_split = io_pad.split('_')
assert pad_split[1] == 'P'
io_pad = f"{pad_split[0]}_PN_{pad_split[2]}"
platform.add_extension([
(io_name, 0, Pins(1)),
(f"{io_name}_ena", 0, Pins(1)),
(f"{io_name}_term", 0, Pins(1)),
])
o_data = platform.request(io_name)
i_ena = platform.request(io_name + "_ena")
i_term = platform.request(io_name + "_term")
self.comb += [
o.eq(o_data),
i_ena.eq(1),
i_term.eq(1),
]
block = {
"type" : "LVDS",
"mode" : "INPUT",
"rx_mode" : "NORMAL",
"name" : io_name,
"sig" : o_data,
"ena" : i_ena,
"term" : i_term,
"location" : io_pad,
"size" : 1,
}
platform.toolchain.ifacewriter.blocks.append(block)
platform.toolchain.excluded_ios.append(platform.get_pin(i_p))
platform.toolchain.excluded_ios.append(platform.get_pin(i_n))
platform.toolchain.excluded_ios.append(o_data)
platform.toolchain.excluded_ios.append(i_term)
platform.toolchain.excluded_ios.append(i_ena)
class EfinixDifferentialInput:
@staticmethod
def lower(dr):
return EfinixDifferentialInputImpl(dr.platform, dr.i_p, dr.i_n, dr.o)
# Efinix DDROutput ---------------------------------------------------------------------------------
class EfinixDDROutputImpl(Module):
@ -264,6 +318,7 @@ efinix_special_overrides = {
ClkOutput : EfinixClkOutput,
Tristate : EfinixTristate,
DifferentialOutput : EfinixDifferentialOutput,
DifferentialInput : EfinixDifferentialInput,
SDRTristate : EfinixSDRTristate,
DDROutput : EfinixDDROutput,
DDRInput : EfinixDDRInput,