diff --git a/rtl/VX_define.v b/rtl/VX_define.v
index 9c29b003..dcebd7df 100644
--- a/rtl/VX_define.v
+++ b/rtl/VX_define.v
@@ -236,3 +236,12 @@
 `define ICACHE_MEM_REQ_ADDR_MASK (32'hffffffff - (`ICACHE_BLOCK-1))
 
 
+
+///////
+
+
+`define SHARED_MEMORY_SIZE 4096
+`define SHARED_MEMORY_BANKS 4
+`define SHARED_MEMORY_BYTES_PER_READ 16
+`define SHARED_MEMORY_HEIGHT ((`SHARED_MEMORY_SIZE) / (`SHARED_MEMORY_BANKS * `SHARED_MEMORY_BYTES_PER_READ))
+