From a5e9ffa36f196e2bb5fb6fb11636e559beab850f Mon Sep 17 00:00:00 2001
From: Larry Ruckman <ruckman@slac.stanford.edu>
Date: Fri, 19 Jul 2024 16:42:34 -0700
Subject: [PATCH] bug fix for index=-1 case

---
 src/rogue/interfaces/memory/Block.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/rogue/interfaces/memory/Block.cpp b/src/rogue/interfaces/memory/Block.cpp
index ea1de57cd..b01646ee5 100644
--- a/src/rogue/interfaces/memory/Block.cpp
+++ b/src/rogue/interfaces/memory/Block.cpp
@@ -194,7 +194,10 @@ void rim::Block::intStartTransaction(uint32_t type, bool forceWr, bool check, ri
             }
         } else {
             if (type == rim::Read || type == rim::Verify) {
-                if (index < 0 || index >= var->numValues_) {
+                if (index < 0) {
+                    lowByte  = 0;
+                    highByte = size_ - 1;
+                } else if (index >= var->numValues_) {
                     lowByte  = var->lowTranByte_[0];
                     highByte = var->highTranByte_[0];
                 } else {