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frontend/axi: add buffer to accept command before converting burst to beats

This commit is contained in:
Florent Kermarrec 2018-08-28 14:09:59 +02:00
parent c15c47497a
commit 92c8513598
1 changed files with 9 additions and 5 deletions
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14
litedram/frontend/axi.py
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@ -133,9 +133,11 @@ class LiteDRAMAXI2NativeW(Module):
ashift = log2_int(port.data_width//8)
# Burst to Beat
aw_buffer = stream.Buffer(ax_description(axi.address_width, axi.id_width))
self.comb += axi.aw.connect(aw_buffer.sink)
aw = stream.Endpoint(ax_description(axi.address_width, axi.id_width))
aw_burst2beat = LiteDRAMAXIBurst2Beat(axi.aw, aw)
self.submodules += aw_burst2beat
aw_burst2beat = LiteDRAMAXIBurst2Beat(aw_buffer.source, aw)
self.submodules += aw_buffer, aw_burst2beat
# Write Buffer
w_buffer = stream.SyncFIFO(w_description(axi.data_width), buffer_depth)
@ -168,7 +170,7 @@ class LiteDRAMAXI2NativeW(Module):
# Write Data
self.comb += [
axi.w.connect(w_buffer.sink),
If(id_buffer.source.valid, axi.w.connect(w_buffer.sink)),
w_buffer.source.connect(port.wdata, omit={"strb"}),
port.wdata.we.eq(w_buffer.source.strb)
]
@ -186,9 +188,11 @@ class LiteDRAMAXI2NativeR(Module):
ashift = log2_int(port.data_width//8)
# Burst to Beat
ar_buffer = stream.Buffer(ax_description(axi.address_width, axi.id_width))
self.comb += axi.ar.connect(ar_buffer.sink)
ar = stream.Endpoint(ax_description(axi.address_width, axi.id_width))
ar_burst2beat = LiteDRAMAXIBurst2Beat(axi.ar, ar)
self.submodules += ar_burst2beat
ar_burst2beat = LiteDRAMAXIBurst2Beat(ar_buffer.source, ar)
self.submodules += ar_buffer, ar_burst2beat
# Read buffer
r_buffer = stream.SyncFIFO(r_description(axi.data_width, axi.id_width), buffer_depth)