from nmigen.utils import log2_int
from nmutil.latch import SRLatch, latchregister
+from nmutil.util import rising_edge
from soc.decoder.power_decoder2 import Data
from soc.scoreboard.addr_match import LenExpand
# for testing purposes
from soc.experiment.testmem import TestMemory
+#from soc.scoreboard.addr_split import LDSTSplitter
+
import unittest
self.st = Data(regwid, "st_data_i") # ok to be set by CompUnit
def connect_port(self, inport):
- print ("connect_port", self, inport)
+ print("connect_port", self, inport)
return [self.is_ld_i.eq(inport.is_ld_i),
self.is_st_i.eq(inport.is_st_i),
self.data_len.eq(inport.data_len),
# state-machine latches
m.submodules.st_active = st_active = SRLatch(False, name="st_active")
+ m.submodules.st_done = st_done = SRLatch(False, name="st_done")
m.submodules.ld_active = ld_active = SRLatch(False, name="ld_active")
m.submodules.reset_l = reset_l = SRLatch(True, name="reset")
m.submodules.adrok_l = adrok_l = SRLatch(False, name="addr_acked")
m.submodules.busy_l = busy_l = SRLatch(False, name="busy")
m.submodules.cyc_l = cyc_l = SRLatch(True, name="cyc")
+
+ self.busy_l = busy_l
+
+ sync += st_done.s.eq(0)
+ comb += st_done.r.eq(0)
+ comb += st_active.r.eq(0)
+ comb += ld_active.r.eq(0)
comb += cyc_l.s.eq(0)
comb += cyc_l.r.eq(0)
+ comb += busy_l.s.eq(0)
+ comb += busy_l.r.eq(0)
sync += adrok_l.s.eq(0)
comb += adrok_l.r.eq(0)
lds = Signal(reset_less=True)
sts = Signal(reset_less=True)
pi = self.pi
- comb += lds.eq(pi.is_ld_i & pi.busy_o) # ld-req signals
- comb += sts.eq(pi.is_st_i & pi.busy_o) # st-req signals
+ comb += lds.eq(pi.is_ld_i) # ld-req signals
+ comb += sts.eq(pi.is_st_i) # st-req signals
+
+ # detect busy "edge"
+ busy_delay = Signal()
+ busy_edge = Signal()
+ sync += busy_delay.eq(pi.busy_o)
+ comb += busy_edge.eq(pi.busy_o & ~busy_delay)
+
+ # activate mode: only on "edge"
+ comb += ld_active.s.eq(rising_edge(m, lds)) # activate LD mode
+ comb += st_active.s.eq(rising_edge(m, sts)) # activate ST mode
- # activate mode
- with m.If(lds):
- comb += ld_active.s.eq(1) # activate LD mode
- with m.Elif(sts):
- comb += st_active.s.eq(1) # activate ST mode
+ # LD/ST requested activates "busy" (only if not already busy)
+ with m.If(self.pi.is_ld_i | self.pi.is_st_i):
+ comb += busy_l.s.eq(~busy_delay)
# if now in "LD" mode: wait for addr_ok, then send the address out
# to memory, acknowledge address, and send out LD data
# is a "Memory" test-class) the memory read data is valid.
comb += reset_l.s.eq(0)
comb += reset_l.r.eq(0)
+ lddata = Signal(self.regwid, reset_less=True)
+ data, ldok = self.get_rd_data(m)
+ comb += lddata.eq((data & lenexp.rexp_o) >>
+ (lenexp.addr_i*8))
with m.If(ld_active.q & adrok_l.q):
# shift data down before pushing out. requires masking
# from the *byte*-expanded version of LenExpand output
- lddata = Signal(self.regwid, reset_less=True)
- data, ldok = self.get_rd_data(m)
- comb += lddata.eq((data & lenexp.rexp_o) >>
- (lenexp.addr_i*8))
comb += pi.ld.data.eq(lddata) # put data out
comb += pi.ld.ok.eq(ldok) # indicate data valid
comb += reset_l.s.eq(ldok) # reset mode after 1 cycle
# TODO: replace with link to LoadStoreUnitInterface.x_store_data
# and also handle the ready/stall/busy protocol
stok = self.set_wr_data(m, stdata, lenexp.lexp_o)
+ sync += st_done.s.eq(1) # store done trigger
+ with m.If(st_done.q):
comb += reset_l.s.eq(stok) # reset mode after 1 cycle
# ugly hack, due to simultaneous addr req-go acknowledge
comb += st_active.r.eq(1) # leave the ST active for 1 cycle
comb += reset_l.r.eq(1) # clear reset
comb += adrok_l.r.eq(1) # address reset
-
- # LD/ST requested activates "busy"
- with m.If(self.pi.is_ld_i | self.pi.is_st_i):
- comb += busy_l.s.eq(1)
+ comb += st_done.r.eq(1) # store done reset
# monitor for an exception or the completion of LD.
with m.If(self.pi.addr_exc_o):
comb += busy_l.r.eq(1)
# however ST needs one cycle before busy is reset
- with m.If(self.pi.st.ok | self.pi.ld.ok):
+ #with m.If(self.pi.st.ok | self.pi.ld.ok):
+ with m.If(reset_l.s):
comb += cyc_l.s.eq(1)
with m.If(cyc_l.q):
comb += busy_l.r.eq(1)
# busy latch outputs to interface
- comb += self.pi.busy_o.eq(busy_l.q)
+ comb += pi.busy_o.eq(busy_l.q)
return m
def ports(self):
- for p in self.dports:
- yield from p.ports()
+ yield from self.pi.ports()
class TestMemoryPortInterface(PortInterfaceBase):
def set_wr_data(self, m, data, wen):
m.d.comb += self.mem.wrport.data.eq(data) # write st to mem
- m.d.comb += self.mem.wrport.en.eq(wen) # enable writes
+ m.d.comb += self.mem.wrport.en.eq(wen) # enable writes
return Const(1, 1)
def get_rd_data(self, m):
def ports(self):
yield from super().ports()
# TODO: memory ports
-
-
projects / soc.git / blobdiff