From 0159376cda9c03cac63dbccbca3ad02d9516f8e7 Mon Sep 17 00:00:00 2001
From: Alex Forencich <alex@alexforencich.com>
Date: Sat, 10 Nov 2018 17:35:31 -0800
Subject: [PATCH] Simplify IFG count handling

---
 tb/xgmii_ep.py | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/tb/xgmii_ep.py b/tb/xgmii_ep.py
index 741544a3..7ec9585a 100644
--- a/tb/xgmii_ep.py
+++ b/tb/xgmii_ep.py
@@ -186,12 +186,6 @@ class XGMIISource(object):
                         if name is not None:
                             print("[%s] Sending frame %s" % (name, repr(frame)))
 
-                        if ifg_cnt >= 4:
-                            deficit_idle_cnt = ifg_cnt - 4
-                        else:
-                            deficit_idle_cnt = ifg_cnt
-                            ifg_cnt = 0
-
                         assert len(dl) > 0
                         assert dl[0] == 0x55
                         dl[0] = 0xfb
@@ -201,11 +195,15 @@ class XGMIISource(object):
                         d = 0
                         c = 0
 
-                        if ifg_cnt > 0:
+                        if bw == 8 and ifg_cnt >= 4:
+                            ifg_cnt = max(ifg_cnt-4, 0)
                             k = 4
                             d = 0x07070707
                             c = 0xf
 
+                        deficit_idle_cnt = ifg_cnt
+                        ifg_cnt = 0
+
                         for i in range(k,bw):
                             if len(dl) > 0:
                                 d |= dl.pop(0) << (8*i)