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core/arp: Simplify request_pending.

This commit is contained in:
Florent Kermarrec 2023-07-31 11:16:19 +02:00
parent 4dbcb53411
commit fc4ed41dcf
1 changed files with 6 additions and 15 deletions
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21
liteeth/core/arp.py
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@ -166,20 +166,11 @@ class LiteEthARPTable(LiteXModule):
# # # # # #
request_pending = Signal() request_pending = Signal()
request_pending_clr = Signal()
request_pending_set = Signal()
self.sync += \
If(request_pending_clr,
request_pending.eq(0)
).Elif(request_pending_set,
request_pending.eq(1)
)
request_counter = Signal(max=max_requests) request_counter = Signal(max=max_requests)
request_ip_address = Signal(32, reset_less=True) request_ip_address = Signal(32, reset_less=True)
self.request_timer = WaitTimer(int(clk_freq//10)) self.request_timer = WaitTimer(int(100e-3*clk_freq))
self.comb += self.request_timer.wait.eq(request_pending) self.comb += self.request_timer.wait.eq(request_pending)
# Note: Store only 1 IP/MAC couple, can be improved with a real # Note: Store only 1 IP/MAC couple, can be improved with a real
@ -202,7 +193,7 @@ class LiteEthARPTable(LiteXModule):
NextState("UPDATE_TABLE"), NextState("UPDATE_TABLE"),
).Elif(request_counter == (max_requests - 1), ).Elif(request_counter == (max_requests - 1),
NextState("PRESENT_RESPONSE") NextState("PRESENT_RESPONSE")
).Elif(request.valid | (request_pending & self.request_timer.done), ).Elif(request.valid | self.request_timer.done,
NextState("CHECK_TABLE") NextState("CHECK_TABLE")
) )
) )
@ -216,7 +207,7 @@ class LiteEthARPTable(LiteXModule):
) )
) )
fsm.act("UPDATE_TABLE", fsm.act("UPDATE_TABLE",
request_pending_clr.eq(1), NextValue(request_pending, 0),
update.eq(1), update.eq(1),
NextState("CHECK_TABLE") NextState("CHECK_TABLE")
) )
@ -263,7 +254,7 @@ class LiteEthARPTable(LiteXModule):
self.request_timer.wait.eq(0), self.request_timer.wait.eq(0),
NextValue(request_counter, request_counter + 1), NextValue(request_counter, request_counter + 1),
), ),
request_pending_set.eq(1), NextValue(request_pending, 1),
request.ready.eq(1), request.ready.eq(1),
NextState("IDLE") NextState("IDLE")
) )
@ -274,7 +265,7 @@ class LiteEthARPTable(LiteXModule):
If(request_counter == (max_requests - 1), If(request_counter == (max_requests - 1),
response.failed.eq(1), response.failed.eq(1),
NextValue(request_counter, 0), NextValue(request_counter, 0),
request_pending_clr.eq(1) NextValue(request_pending, 0),
), ),
If(response.ready, If(response.ready,
NextState("IDLE") NextState("IDLE")