From 9950904cb56159bf5c5df1d3fcd4d25ea2e36d8d Mon Sep 17 00:00:00 2001 From: Florent Kermarrec Date: Wed, 31 May 2023 09:21:14 +0200 Subject: [PATCH] frontend/avalon: Simplify start condition. --- litedram/frontend/avalon.py | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/litedram/frontend/avalon.py b/litedram/frontend/avalon.py index 83b4229..8a76e90 100644 --- a/litedram/frontend/avalon.py +++ b/litedram/frontend/avalon.py @@ -53,8 +53,7 @@ class LiteDRAMAvalonMM2Native(LiteXModule): address = Signal(port.address_width) byteenable = Signal(avalon_data_width//8) writedata = Signal(avalon_data_width) - start_transaction = Signal() - start_condition = Signal() + start = Signal() cmd_ready_seen = Signal() cmd_ready_count = Signal(9) @@ -66,11 +65,11 @@ class LiteDRAMAvalonMM2Native(LiteXModule): ] self.comb += [ - burst_start .eq(avalon.burstcount >= 2), - burst_active.eq(burst_count >= 1), + burst_start .eq(avalon.burstcount > 1), + burst_active.eq(burst_count > 0), ] self.sync += [ - If(start_transaction, + If(start, byteenable.eq(avalon.byteenable), burst_count.eq(avalon.burstcount), address.eq(avalon.address - offset), @@ -87,17 +86,20 @@ class LiteDRAMAvalonMM2Native(LiteXModule): port.cmd.valid.eq(avalon.read | avalon.write) ), - start_transaction.eq(avalon.read | avalon.write), - If(downconvert, - start_condition.eq(start_transaction) - ).Else( - start_condition.eq(start_transaction & (burst_start | port.cmd.ready)) + If(avalon.read | avalon.write, + If(downconvert, + start.eq(1) + ).Else( + start.eq(burst_start | port.cmd.ready) + ) ), - If(start_condition, + If(start, If(downconvert, avalon.waitrequest.eq(1) ).Else( - If(~burst_start, avalon.waitrequest.eq(0)) + If(~burst_start, + avalon.waitrequest.eq(0) + ) ), If(avalon.write, If(burst_start,