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sram: support for different burst settings on read

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This commit is contained in:
mwojcik 2021-08-16 11:51:50 +02:00
parent b6dd5bea68
commit f015d6732b
1 changed files with 14 additions and 16 deletions
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30
src/gateware/aux_controller.py
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@ -34,13 +34,8 @@ class SRAM(Module):
###
# probably will get removed
self.addr_base = CSRStorage(32)
# Dout : Data received from CPU, output by SRAM <- port.dat_r
# Din : Data driven into SRAM, written into CPU <- port.dat_w
# When stb assert, index shows word being read/written, dout/din holds <- will be removed
# data
#
# Cycle:
# Then out_burst_len words are strobed out of dout
@ -51,20 +46,17 @@ class SRAM(Module):
self.dout = Signal(64)
self.din = Signal(64)
# probably not correct here
self.sync += If(self.trigger_stb, self.trig_count.status.eq(self.trig_count.status+1))
ar, aw, w, r, b = attrgetter("ar", "aw", "w", "r", "b")(bus)
### Read
self.comb += [
port.adr.eq(ar.addr),
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),
# 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),
]
# read control
@ -77,6 +69,7 @@ class SRAM(Module):
)
read_fsm.act("READ_START",
r.data.eq(port.dat_r),
r.resp.eq(axi.Response.okay.value),
r.valid.eq(1),
If(r.ready,
r.data.eq(port.dat_r), # that should be always updated, right?
@ -96,7 +89,12 @@ class SRAM(Module):
ar.ready.eq(0)
).Else(If(r.ready & read_fsm.ongoing("READ"),
self.dout_index.eq(self.dout_index+1),
port.adr.eq(port.adr + self.dout_index), # update address in the port
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
If(self.dout_index==ar.len, r.last.eq(1)) # and update last
)
)
@ -104,7 +102,7 @@ class SRAM(Module):
### Write
self.comb += [
w.data.eq(port.dat_w),
port.dat_w.eq(w.data),
port.addr.eq(aw.addr),
w.strb.eq(0xff),
aw.burst.eq(axi.Burst.incr.value),