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core/bandwidth: avoid missing a command

This commit is contained in:
Jędrzej Boczar 2020-04-03 13:24:05 +02:00
parent c03bed8ef6
commit f0496b20ec
1 changed files with 12 additions and 7 deletions
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19
litedram/core/bandwidth.py
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@ -14,8 +14,8 @@ from litex.soc.interconnect.csr import *
class Bandwidth(Module, AutoCSR): class Bandwidth(Module, AutoCSR):
def __init__(self, cmd, data_width, period_bits=24): def __init__(self, cmd, data_width, period_bits=24):
self.update = CSR() self.update = CSR()
self.nreads = CSRStatus(period_bits) self.nreads = CSRStatus(period_bits + 1)
self.nwrites = CSRStatus(period_bits) self.nwrites = CSRStatus(period_bits + 1)
self.data_width = CSRStatus(bits_for(data_width), reset=data_width) self.data_width = CSRStatus(bits_for(data_width), reset=data_width)
# # # # # #
@ -33,17 +33,22 @@ class Bandwidth(Module, AutoCSR):
counter = Signal(period_bits) counter = Signal(period_bits)
period = Signal() period = Signal()
nreads = Signal(period_bits) nreads = Signal(period_bits + 1)
nwrites = Signal(period_bits) nwrites = Signal(period_bits + 1)
nreads_r = Signal(period_bits) nreads_r = Signal(period_bits + 1)
nwrites_r = Signal(period_bits) nwrites_r = Signal(period_bits + 1)
self.sync += [ self.sync += [
Cat(counter, period).eq(counter + 1), Cat(counter, period).eq(counter + 1),
If(period, If(period,
nreads_r.eq(nreads), nreads_r.eq(nreads),
nwrites_r.eq(nwrites), nwrites_r.eq(nwrites),
nreads.eq(0), nreads.eq(0),
nwrites.eq(0) nwrites.eq(0),
# don't miss command if there is one on period boundary
If(cmd_valid & cmd_ready,
If(cmd_is_read, nreads.eq(1)),
If(cmd_is_write, nwrites.eq(1)),
)
).Elif(cmd_valid & cmd_ready, ).Elif(cmd_valid & cmd_ready,
If(cmd_is_read, nreads.eq(nreads + 1)), If(cmd_is_read, nreads.eq(nreads + 1)),
If(cmd_is_write, nwrites.eq(nwrites + 1)), If(cmd_is_write, nwrites.eq(nwrites + 1)),