snooping response handling

hw/rtl/interfaces/VX_cache_snp_req_if.v

@@ -4,11 +4,13 @@
 `include "../cache/VX_cache_config.vh"
 
 interface VX_cache_snp_req_if #(
-    parameter DRAM_ADDR_WIDTH = 1
+    parameter DRAM_ADDR_WIDTH = 0,
+    parameter SNP_TAG_WIDTH   = 0
 ) ();
 
     wire                        snp_req_valid;
     wire [DRAM_ADDR_WIDTH-1:0]  snp_req_addr;    
+    wire [SNP_TAG_WIDTH-1:0]    snp_req_tag;    
     wire                        snp_req_ready;
 
 endinterface

hw/rtl/interfaces/VX_cache_snp_rsp_if.v

@@ -0,0 +1,16 @@
+`ifndef VX_CACHE_SNP_RSP_IF
+`define VX_CACHE_SNP_RSP_IF
+
+`include "../cache/VX_cache_config.vh"
+
+interface VX_cache_snp_rsp_if #(
+    parameter SNP_TAG_WIDTH = 0
+) ();
+
+    wire                        snp_rsp_valid;
+    wire [SNP_TAG_WIDTH-1:0]    snp_rsp_tag;    
+    wire                        snp_rsp_ready;
+
+endinterface
+
+`endif