Hardware/litedram
1
0
Fork 0
mirror of https://github.com/enjoy-digital/litedram.git synced 2025-01-04 09:52:25 -05:00
Code Issues Projects Releases Packages Wiki Activity

core/refresher: remove req/ack signal and use stream

Browse source
This commit is contained in:
Florent Kermarrec 2016-05-03 17:45:57 +02:00
parent 3d9ea833dd
commit 4c1b97b465
2 changed files with 12 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
litedram/core/multiplexer.py
View file

@ -159,7 +159,7 @@ class Multiplexer(Module, AutoCSR):
write_time_en, max_write_time = anti_starvation(settings.write_time)
# Refresh
self.comb += [bm.refresh_req.eq(refresher.req) for bm in bank_machines]
self.comb += [bm.refresh_req.eq(refresher.cmd.valid) for bm in bank_machines]
go_to_refresh = Signal()
bm_refresh_gnts = [bm.refresh_gnt for bm in bank_machines]
self.comb += go_to_refresh.eq(reduce(and_, bm_refresh_gnts))
@ -228,8 +228,8 @@ class Multiplexer(Module, AutoCSR):
)
fsm.act("REFRESH",
steerer.sel[0].eq(STEER_REFRESH),
refresher.ack.eq(1),
If(~refresher.req,
refresher.cmd.ready.eq(1),
If(refresher.cmd.valid & refresher.cmd.last,
NextState("READ")
)
)

16
litedram/core/refresher.py
View file

@ -1,15 +1,16 @@
from litex.gen import *
from litex.gen.genlib.misc import timeline, WaitTimer
from litex.soc.interconnect import stream
from litedram.core.multiplexer import *
class Refresher(Module):
def __init__(self, settings):
self.req = Signal()
self.ack = Signal() # 1st command 1 cycle after assertion of ack
self.cmd = cmd = Record(cmd_request_layout(settings.geom.addressbits,
settings.geom.bankbits))
# 1st command 1 cycle after assertion of ready
self.cmd = cmd = stream.Endpoint(cmd_request_rw_layout(settings.geom.addressbits,
settings.geom.bankbits))
# # #
@ -51,15 +52,16 @@ class Refresher(Module):
)
)
fsm.act("WAIT_GRANT",
self.req.eq(1),
If(self.ack,
cmd.valid.eq(1),
If(cmd.ready,
seq_start.eq(1),
NextState("WAIT_SEQ")
)
)
fsm.act("WAIT_SEQ",
self.req.eq(1),
cmd.valid.eq(1),
If(seq_done,
cmd.last.eq(1),
NextState("IDLE")
)
)