litex/misoclib/tools/litescope/core/trigger.py

from misoclib.tools.litescope.common import *

class LiteScopeSumUnit(Module, AutoCSR):
	def __init__(self, ports):
		self.sinks = sinks = [Sink(hit_layout()) for i in range(ports)]
		self.source = source = Source(hit_layout())

		self.prog_we = Signal()
		self.prog_adr = Signal(ports)
		self.prog_dat = Signal()

		mem = Memory(1, 2**ports)
		lut = mem.get_port()
		prog = mem.get_port(write_capable=True)
		self.specials += mem, lut, prog

		###

		# program port
		self.comb += [
			prog.we.eq(self.prog_we),
			prog.adr.eq(self.prog_adr),
			prog.dat_w.eq(self.prog_dat)
		]

		# LUT port
		for i, sink in enumerate(sinks):
			self.comb += lut.adr[i].eq(sink.hit)

		# drive source
		self.comb += [
			source.stb.eq(optree("&", [sink.stb for sink in sinks])),
			source.hit.eq(lut.dat_r)
		]
		for i, sink in enumerate(sinks):
			self.comb += sink.ack.eq(sink.stb & source.ack)

class LiteScopeSum(LiteScopeSumUnit, AutoCSR):
	def __init__(self, ports):
		LiteScopeSumUnit.__init__(self, ports)
		self._prog_we = CSR()
		self._prog_adr = CSRStorage(ports)
		self._prog_dat = CSRStorage()
		###
		self.comb += [
			self.prog_we.eq(self._prog_we.re & self._prog_we.r),
			self.prog_adr.eq(self._prog_adr.storage),
			self.prog_dat.eq(self._prog_dat.storage)
		]

class LiteScopeTrigger(Module, AutoCSR):
	def __init__(self, dw):
		self.dw = dw
		self.ports = []
		self.sink = Sink(data_layout(dw))
		self.source = Source(hit_layout())

	def add_port(self, port):
		setattr(self.submodules, "port"+str(len(self.ports)), port)
		self.ports.append(port)

	def do_finalize(self):
		self.submodules.sum = LiteScopeSum(len(self.ports))
		###
		for i, port in enumerate(self.ports):
			# Note: port's ack is not used and supposed to be always 1
			self.comb += [
				port.sink.stb.eq(self.sink.stb),
				port.sink.data.eq(self.sink.data),
				self.sink.ack.eq(1),
				Record.connect(port.source, self.sum.sinks[i])
			]
		self.comb += Record.connect(self.sum.source, self.source)