sram/verilog/sl_ahb_sram.v

+//-----------------------------------------------------------------------------
+// SoCLabs FPGA SRAM Wrapper 
+// - to be substitued with same name file in filelist when moving to ASIC
+// A joint work commissioned on behalf of SoC Labs, under Arm Academic Access license.
+//
+// Contributors
+//
+// David Mapstone (d.a.mapstone@soton.ac.uk)
+//
+// Copyright 2021-3, SoC Labs (www.soclabs.org)
+//-----------------------------------------------------------------------------
+
+module sl_ahb_sram #(
+    // System Parameters
+    parameter SYS_ADDR_W = 32,  // System Address Width
+    parameter SYS_DATA_W = 32,  // System Data Width
+    parameter RAM_ADDR_W = 14,  // Size of SRAM
+    parameter RAM_DATA_W = 32,  // Data Width of RAM
+    parameter FILENAME   = "image.hex" // Initial Image to Populate Memory with
+)(
+    // --------------------------------------------------------------------------
+    // Port Definitions
+    // --------------------------------------------------------------------------
+    input  wire                  HCLK,      // system bus clock
+    input  wire                  HRESETn,   // system bus reset
+    input  wire                  HSEL,      // AHB peripheral select
+    input  wire                  HREADY,    // AHB ready input
+    input  wire            [1:0] HTRANS,    // AHB transfer type
+    input  wire            [2:0] HSIZE,     // AHB hsize
+    input  wire                  HWRITE,    // AHB hwrite
+    input  wire [RAM_ADDR_W-1:0] HADDR,     // AHB address bus
+    input  wire           [31:0] HWDATA,    // AHB write data bus
+    output wire                  HREADYOUT, // AHB ready output to S->M mux
+    output wire                  HRESP,     // AHB response
+    output wire [SYS_DATA_W-1:0] HRDATA     // AHB read data bus
+);
+    
+    // Internal Wiring
+    wire  [RAM_ADDR_W-3:0] addr;
+    wire  [RAM_DATA_W-1:0] wdata;
+    wire  [RAM_DATA_W-1:0] rdata;
+    wire             [3:0] wen;
+    wire                   cs;
+    
+    // AHB to SRAM Conversion
+    cmsdk_ahb_to_sram #(
+        .AW (RAM_ADDR_W)
+    ) u_ahb_to_sram (
+        // AHB Inputs
+        .HCLK       (HCLK),
+        .HRESETn    (HRESETn),
+        .HSEL       (HSEL),  
+        .HADDR      (HADDR[RAM_ADDR_W-1:0]),
+        .HTRANS     (HTRANS),
+        .HSIZE      (HSIZE),
+        .HWRITE     (HWRITE),
+        .HWDATA     (HWDATA),
+        .HREADY     (HREADY),
+
+        // AHB Outputs
+        .HREADYOUT  (HREADYOUT),
+        .HRDATA     (HRDATA),
+        .HRESP      (HRESP),
+
+        // SRAM input
+        .SRAMRDATA  (rdata),
+        
+        // SRAM Outputs
+        .SRAMADDR   (addr),
+        .SRAMWDATA  (wdata),
+        .SRAMWEN    (wen),
+        .SRAMCS     (cs)
+   );
+
+    // FPGA SRAM model
+    cmsdk_fpga_sram #(
+        .AW (RAM_ADDR_W)
+    ) u_sram (
+        // SRAM Inputs
+        .CLK        (HCLK),
+        .ADDR       (addr),
+        .WDATA      (wdata),
+        .WREN       (wen),
+        .CS         (cs),
+        
+        // SRAM Output
+        .RDATA      (rdata)
+    );
+endmodule
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