From 53ce81343aea61e12f5268c362fbb9ccaf792f86 Mon Sep 17 00:00:00 2001
From: David Shah <davey1576@gmail.com>
Date: Wed, 27 Jun 2018 12:23:12 +0200
Subject: [PATCH] ice40: Add timing paths for carry

Signed-off-by: David Shah <davey1576@gmail.com>
---
 ice40/arch.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/ice40/arch.cc b/ice40/arch.cc
index fbad6ab0..6bca62e4 100644
--- a/ice40/arch.cc
+++ b/ice40/arch.cc
@@ -494,6 +494,15 @@ bool Arch::getCellDelay(const CellInfo *cell, IdString fromPort, IdString toPort
                 delay = 450;
                 return true;
             }
+        } else if (fromPort == id("CI") && toPort == id("CO")) {
+            delay = 120;
+            return true;
+        } else if (fromPort == id("I1") && toPort == id("CO")) {
+            delay = 260;
+            return true;
+        } else if (fromPort == id("I2") && toPort == id("CO")) {
+            delay = 230;
+            return true;
         }
     }
     return false;