litex/milkymist/dvisampler/__init__.py

from migen.fhdl.structure import *
from migen.fhdl.module import Module
from migen.bank.description import *

from milkymist.dvisampler.edid import EDID
from milkymist.dvisampler.clocking import Clocking
from milkymist.dvisampler.datacapture import DataCapture
from milkymist.dvisampler.charsync import CharSync
from milkymist.dvisampler.decoding import Decoding
from milkymist.dvisampler.chansync import ChanSync

class DVISampler(Module, AutoReg):
	def __init__(self, inversions=""):
		self.submodules.edid = EDID()
		self.sda = self.edid.sda
		self.scl = self.edid.scl

		self.submodules.clocking = Clocking()
		self.clk = self.clocking.clkin

		for datan in "012":
			name = "data" + str(datan)
			invert = datan in inversions
			
			signame = name + "_n" if invert else name
			s = Signal(name=signame)
			setattr(self, signame, s)

			cap = DataCapture(8, invert)
			setattr(self.submodules, name + "_cap", cap)
			self.comb += [
				cap.pad.eq(s),
				cap.serdesstrobe.eq(self.clocking.serdesstrobe)
			]

			charsync = CharSync()
			setattr(self.submodules, name + "_charsync", charsync)
			self.comb += charsync.raw_data.eq(cap.d)

			decoding = Decoding()
			setattr(self.submodules, name + "_decod", decoding)
			self.comb += [
				decoding.valid_i.eq(charsync.synced),
				decoding.input.eq(charsync.data)
			]

		self.submodules.chansync = ChanSync()
		self.comb += [
			self.chansync.valid_i.eq(self.data0_decod.valid_o & \
			  self.data1_decod.valid_o & self.data2_decod.valid_o),
			self.chansync.data_in0.eq(self.data0_decod.output),
			self.chansync.data_in1.eq(self.data1_decod.output),
			self.chansync.data_in2.eq(self.data2_decod.output),
		]

		de = self.chansync.data_out0.de
		r = self.chansync.data_out2.d
		g = self.chansync.data_out1.d
		b = self.chansync.data_out0.d
		hsync = self.chansync.data_out0.c[0]
		vsync = self.chansync.data_out0.c[1]