Added CSR IO req/rsp V0.1

hw/rtl/VX_core.v

@@ -70,12 +70,47 @@ module VX_core #(
     input wire [`DCORE_TAG_WIDTH-1:0]       io_rsp_tag,
     output wire                             io_rsp_ready,
 
+    // IO CSR Request
+    input  wire                              csr_io_req_valid,
+    input  wire[`NC_BITS-1:0]                csr_io_req_cid,
+    input  wire[11:0]                        csr_io_req_addr,
+    input  wire                              csr_io_req_rw,
+    input  wire[31:0]                        csr_io_req_data,
+    output wire                              csr_io_req_ready,
+
+    // IO CSR Response
+    output wire                              csr_io_rsp_valid,
+    output wire[31:0]                        csr_io_rsp_data,
+
     // Status
     output wire                             busy, 
     output wire                             ebreak
 );
-    // Dcache Interfaces   
 
+    // IO CSR request
+    VX_csr_req_if io_csr_req();
+    wire temp_io_csr_req_valid    = csr_io_req_valid & (csr_io_req_cid == CORE_ID[`NC_BITS-1:0]);
+    assign io_csr_req.valid       = {`NUM_THREADS{temp_io_csr_req_valid}};
+    assign io_csr_req.is_csr      = 1'b1;
+    assign io_csr_req.csr_address = csr_io_req_addr; 
+    assign io_csr_req.alu_op      = csr_io_req_rw ? `ALU_CSR_RW : `ALU_CSR_RS; 
+    assign io_csr_req.csr_mask    = csr_io_req_rw ? csr_io_req_data : 32'b0;
+
+
+
+    VX_wb_if io_csr_rsp();
+    assign csr_io_req_ready    = io_csr_rsp.is_io;
+    assign csr_io_rsp_valid    = io_csr_rsp.valid[0];
+    assign csr_io_rsp_data     = io_csr_rsp.data[0];
+`IGNORE_WARNINGS_BEGIN
+    wire [4:0]  unused_rd      = io_csr_rsp.rd;
+    wire [1:0]  unused_wb      = io_csr_rsp.wb;    
+    wire [31:0] unused_curr_PC = io_csr_rsp.curr_PC;    
+`IGNORE_WARNINGS_END
+
+
+
+    // Dcache Interfaces   
     VX_cache_dram_req_if #(
         .DRAM_LINE_WIDTH(`DDRAM_LINE_WIDTH),
         .DRAM_ADDR_WIDTH(`DDRAM_ADDR_WIDTH),
@@ -178,6 +213,11 @@ module VX_core #(
         .clk(clk),
         .reset(reset),
 
+
+        // IO CSR 
+        .io_csr_req         (io_csr_req),
+        .io_csr_rsp         (io_csr_rsp), 
+
         // Dcache core request
         .dcache_req_valid   (core_dcache_req_if.core_req_valid),
         .dcache_req_rw      (core_dcache_req_if.core_req_rw),