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
from milkymist.dvisampler.resdetection import ResolutionDetection

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]

		self.submodules.resdetection = ResolutionDetection()
		self.comb += [
			self.resdetection.de.eq(de),
			self.resdetection.hsync.eq(hsync),
			self.resdetection.vsync.eq(vsync)
		]