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replaced increment logic with ready Incr module

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This commit is contained in:
mwojcik 2021-08-16 15:33:50 +02:00
parent 67ed7fae78
commit 3e1d14ff38
1 changed files with 15 additions and 28 deletions
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43
src/gateware/aux_controller.py
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@ -36,10 +36,6 @@ class SRAM(Module):
# Dout : Data received from CPU, output by SRAM <- port.dat_r
# Din : Data driven into SRAM, written into CPU <- port.dat_w
#
# Cycle:
# Then out_burst_len words are strobed out of dout
# Then, when din_ready is high, in_burst_len words are strobed in to din
self.dout_index = Signal(bus_addr_width) # is this legal?
self.din_index = Signal(bus_addr_width)
self.din_ready = Signal()
@ -48,21 +44,17 @@ class SRAM(Module):
ar, aw, w, r, b = attrgetter("ar", "aw", "w", "r", "b")(bus)
self.r_addr_incr = axi.Incr(ar)
### Read
self.comb += [
port.adr.eq(ar.addr), # still not sure if legal hm
r.data.eq(port.dat_r),
# r.ready.eq(1),
# ar.burst.eq(axi.Burst.incr.value),
# ar.len.eq(OUT_BURST_LEN-1), # Number of transfers in burst (0->1 transfer, 1->2 transfers...)
# ar.size.eq(3), # Width of burst: 3 = 8 bytes = 64 bits
# ar.cache.eq(0xf),
]
self.comb += r.data.eq(port.dat_r)
# read control
self.submodules.read_fsm = read_fsm = FSM(reset_state="IDLE")
read_fsm.act("IDLE",
If(ar.valid,
port.adr.eq(self.r_addr_incr.addr),
ar.ready.eq(1),
NextState("READ_START"),
)
@ -85,16 +77,11 @@ class SRAM(Module):
self.sync += [
If(read_fsm.ongoing("IDLE"),
self.dout_index.eq(0),
r.ready.eq(0), # shall it be reset too on IDLE?
ar.ready.eq(0)
r.valid.eq(0), # shall it be reset too on IDLE?
ar.ready.eq(0),
).Else(If(r.ready & read_fsm.ongoing("READ"),
self.dout_index.eq(self.dout_index+1),
If(ar.burst==axi.Burst.incr.value,
port.adr.eq(port.adr + self.dout_index)
).Else(If(ar.burst==axi.Burst.wrap.value,
port.adr.eq(port.adr + (self.dout_index | ar.len))
)), # update address in the port if it's incr or wrapped burst value
# no port.adr update for fixed burst type
port.adr.eq(self.r_addr_incr.addr),
If(self.dout_index==ar.len, r.last.eq(1)) # and update last
)
)
@ -104,12 +91,12 @@ class SRAM(Module):
self.comb += [
port.dat_w.eq(w.data),
port.addr.eq(aw.addr),
w.strb.eq(0xff),
aw.burst.eq(axi.Burst.incr.value),
aw.len.eq(IN_BURST_LEN-1), # Number of transfers in burst minus 1
aw.size.eq(3), # Width of burst: 3 = 8 bytes = 64 bits
aw.cache.eq(0xf),
b.ready.eq(1),
# w.strb.eq(0xff),
# aw.burst.eq(axi.Burst.incr.value),
# aw.len.eq(IN_BURST_LEN-1), # Number of transfers in burst minus 1
# aw.size.eq(3), # Width of burst: 3 = 8 bytes = 64 bits
# aw.cache.eq(0xf),
# b.ready.eq(1),
]
self.submodules.write_fsm = write_fsm = FSM(reset_state="IDLE")
@ -150,7 +137,7 @@ class SRAM(Module):
self.sync += [
If(write_fsm.ongoing("IDLE"),
self.din_index.eq(0) # replace with address?
self.din_index.eq(0)
), # but need to synchronise the address too
If(w.ready & w.valid, self.din_index.eq(self.din_index+1), port.adr.eq(port.addr+self.din_index))
]