From 706efcdb8e65561daefff2228db31a6dda020324 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 23 Mar 2020 09:24:06 +0000
Subject: [PATCH] sort out unit test for address split

---
 src/soc/scoreboard/addr_split.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/soc/scoreboard/addr_split.py b/src/soc/scoreboard/addr_split.py
index f829c6d7..bf89e097 100644
--- a/src/soc/scoreboard/addr_split.py
+++ b/src/soc/scoreboard/addr_split.py
@@ -140,11 +140,14 @@ def sim(dut):
     sim.add_clock(1e-6)
     data = 0b11010011
     dlen = 4 # 4 bits
-    addr = 0b1101
+    addr = 0b1100
     ld_len = 8
+    ldm = ((1<<ld_len)-1)
     dlm = ((1<<dlen)-1)
+    data = data & ldm # truncate data to be tested, mask to within ld len
+    print ("ldm", ldm, bin(data&ldm))
     print ("dlm", dlm, bin(addr&dlm))
-    dmask = ((1<<ld_len)-1) << (addr & dlm)
+    dmask = ldm << (addr & dlm)
     print ("dmask", bin(dmask))
     dmask1 = dmask >> (1<<dlen)
     print ("dmask1", bin(dmask1))
-- 
2.30.2