From b18085f4c508e63456169585a4315434f52d7ea2 Mon Sep 17 00:00:00 2001
From: Paul Gardner-Stephen <paul@m-e-g-a.org>
Date: Sun, 18 Feb 2024 11:04:45 +1030
Subject: [PATCH] increase write hold time #781

---
 src/vhdl/expansion_port_controller.vhdl | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/vhdl/expansion_port_controller.vhdl b/src/vhdl/expansion_port_controller.vhdl
index 2eb23f149..795b74271 100644
--- a/src/vhdl/expansion_port_controller.vhdl
+++ b/src/vhdl/expansion_port_controller.vhdl
@@ -378,7 +378,10 @@ begin
             -- But we mark the write complete now, so that back-to-back
             -- writes can be scheduled with max timing margin
             cart_write_in_progress <= '0';
-          when 1 | 2 =>
+          when 1 =>
+            -- Allow longer hold time for writes
+            null;
+          when 2 =>
             -- Release key bus lines after a short hold time, and start any new
             -- access we have under way, but only if we don't already have an
             -- access happening.