From: Sebastien Bourdeauducq Date: Sat, 4 Aug 2012 21:39:52 +0000 (+0200) Subject: flow/isd: add freeze register X-Git-Tag: 24jan2021_ls180~2099^2~852 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=47c341ecdf43c77a32c92e0b73bd344e085b0df3;p=litex.git flow/isd: add freeze register --- diff --git a/migen/flow/isd.py b/migen/flow/isd.py index 36c893fc..02339d49 100644 --- a/migen/flow/isd.py +++ b/migen/flow/isd.py @@ -4,14 +4,15 @@ from migen.flow.hooks import DFGHook ISD_MAGIC = 0x6ab4 -# TODO: add freeze class EndpointReporter: def __init__(self, endpoint, nbits): self.endpoint = endpoint + self.nbits = nbits self.reset = Signal() + self.freeze = Signal() - self._ack_count = RegisterField("ack_count", nbits, access_bus=READ_ONLY, access_dev=WRITE_ONLY) - self._nack_count = RegisterField("nack_count", nbits, access_bus=READ_ONLY, access_dev=WRITE_ONLY) + self._ack_count = RegisterField("ack_count", self.nbits, access_bus=READ_ONLY, access_dev=WRITE_ONLY) + self._nack_count = RegisterField("nack_count", self.nbits, access_bus=READ_ONLY, access_dev=WRITE_ONLY) self._cur_stb = Field("cur_stb", 1, access_bus=READ_ONLY, access_dev=WRITE_ONLY) self._cur_ack = Field("cur_ack", 1, access_bus=READ_ONLY, access_dev=WRITE_ONLY) self._cur_status = RegisterFields("cur_status", [self._cur_stb, self._cur_ack]) @@ -22,8 +23,8 @@ class EndpointReporter: def get_fragment(self): stb = Signal() ack = Signal() - ack_count = self._ack_count.field.w - nack_count = self._nack_count.field.w + ack_count = Signal(BV(self.nbits)) + nack_count = Signal(BV(self.nbits)) comb = [ self._cur_stb.w.eq(stb), self._cur_ack.w.eq(ack) @@ -44,6 +45,10 @@ class EndpointReporter: nack_count.eq(nack_count + 1) ) ) + ), + If(~self.freeze, + self._ack_count.field.w.eq(ack_count), + self._nack_count.field.w.eq(nack_count) ) ] return Fragment(comb, sync) @@ -55,6 +60,7 @@ class DFGReporter(DFGHook): self._r_magic = RegisterField("magic", 16, access_bus=READ_ONLY, access_dev=WRITE_ONLY) self._r_neps = RegisterField("neps", 8, access_bus=READ_ONLY, access_dev=WRITE_ONLY) self._r_nbits = RegisterField("nbits", 8, access_bus=READ_ONLY, access_dev=WRITE_ONLY) + self._r_freeze = RegisterField("freeze", 1) self._r_reset = RegisterRaw("reset", 1) self.order = [] @@ -69,7 +75,8 @@ class DFGReporter(DFGHook): print("#" + str(n) + ": " + str(u) + ":" + ep + " -> " + str(v)) def get_registers(self): - registers = [self._r_magic, self._r_neps, self._r_nbits, self._r_reset] + registers = [self._r_magic, self._r_neps, self._r_nbits, + self._r_freeze, self._r_reset] for u, ep, v in self.order: registers += self.nodepair_to_ep[(u, v)][ep].get_registers() return registers @@ -80,5 +87,9 @@ class DFGReporter(DFGHook): self._r_neps.field.w.eq(len(self.order)), self._r_nbits.field.w.eq(self._nbits) ] - comb += [h.reset.eq(self._r_reset.re) for h in self.hooks_iter()] + for h in self.hooks_iter(): + comb += [ + h.freeze.eq(self._r_freeze.field.r), + h.reset.eq(self._r_reset.re) + ] return Fragment(comb) + super().get_fragment()