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core/arp: Simplify request_ip_address.

This commit is contained in:
Florent Kermarrec 2023-07-31 11:00:31 +02:00
parent df053ae739
commit 0abd3fa9fc
1 changed files with 12 additions and 16 deletions
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28
liteeth/core/arp.py
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@ -176,15 +176,7 @@ class LiteEthARPTable(LiteXModule):
request_pending.eq(1)
)
request_ip_address = Signal(32, reset_less=True)
request_ip_address_reset = Signal()
request_ip_address_update = Signal()
self.sync += \
If(request_ip_address_reset,
request_ip_address.eq(0)
).Elif(request_ip_address_update,
request_ip_address.eq(request.ip_address)
)
request_ip_address = Signal(32, reset_less=True)
request_timer = WaitTimer(int(clk_freq//10))
self.submodules += request_timer
@ -217,7 +209,7 @@ class LiteEthARPTable(LiteXModule):
NextState("SEND_REPLY")
).Elif(sink.valid & sink.reply & request_pending,
NextState("UPDATE_TABLE"),
).Elif(request_counter == max_requests-1,
).Elif(request_counter == (max_requests - 1),
NextState("PRESENT_RESPONSE")
).Elif(request.valid | (request_pending & request_timer.done),
NextState("CHECK_TABLE")
@ -251,17 +243,21 @@ class LiteEthARPTable(LiteXModule):
fsm.act("CHECK_TABLE",
If(cached_valid,
If(request_ip_address == cached_ip_address,
request_ip_address_reset.eq(1),
NextValue(request_ip_address, 0),
NextState("PRESENT_RESPONSE"),
).Elif(request.ip_address == cached_ip_address,
request.ready.eq(request.valid),
NextState("PRESENT_RESPONSE"),
).Else(
request_ip_address_update.eq(request.valid),
If(request.valid,
NextValue(request_ip_address, request.ip_address),
),
NextState("SEND_REQUEST")
)
).Else(
request_ip_address_update.eq(request.valid),
If(request.valid,
NextValue(request_ip_address, request.ip_address),
),
NextState("SEND_REQUEST")
)
)
@ -278,15 +274,15 @@ class LiteEthARPTable(LiteXModule):
)
)
self.comb += [
If(request_counter == max_requests - 1,
If(request_counter == (max_requests - 1),
response.failed.eq(1),
request_counter_reset.eq(1),
request_pending_clr.eq(1)
),
response.mac_address.eq(cached_mac_address)
)
]
fsm.act("PRESENT_RESPONSE",
response.valid.eq(1),
response.mac_address.eq(cached_mac_address),
If(response.ready,
NextState("IDLE")
)