1 files changed, 92 insertions, 0 deletions
diff --git a/sources/hdl/verilog/register_file.v b/sources/hdl/verilog/register_file.v
new file mode 100644
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+++ b/sources/hdl/verilog/register_file.v
@@ -0,0 +1,92 @@
+`include "parameters.vh"
+
+/* 
+ * An 8 read 8 write port reg file
+ * satisfying ddr pipeline's needs
+ */
+module register_file(
+
+  // common signals
+  input           clk,
+  input           rst,
+
+  // execute stage <-> reg file if
+  input                                rf_wide_wen,
+  input   [3:0]                        rf_wide_offset,
+  output  [511:0]                      rf_wide_data,
+  output  [32*8-1:0]                   rf_rdata,
+  input   [32*8-1:0]                   rf_wdata,
+  input   [7:0]                        rf_wen,
+  input   [4*8-1:0]                    rf_raddr,
+  input   [4*8-1:0]                    rf_waddr,
+  output  [`COL_WIDTH-1:0]             casr,
+  output  [`BANK_WIDTH+`BG_WIDTH-1:0]  basr,
+  output  [`ROW_WIDTH-1:0]             rasr,
+  // update stride registers, wen is OH (3'b001 = update rasr)
+  input   [31:0]                       srf_value,
+  input   [2:0]                        srf_wen
+  );
+
+  // Stride registers
+  reg [31:0] casr_r, basr_r, rasr_r;
+
+  assign casr = casr_r;
+  assign basr = basr_r;
+  assign rasr = rasr_r;
+
+  // Update stride registers
+  always @(posedge clk) begin
+    if(srf_wen[0]) begin
+      casr_r <= srf_value;
+    end
+    if(srf_wen[1]) begin
+      basr_r <= srf_value;
+    end
+    if(srf_wen[2]) begin
+      rasr_r <= srf_value;
+    end
+  end
+
+  // General purpose registers
+  reg [31:0] reg_file [15:0];
+  
+  // split r&w data signals into human readable form
+  // also drive rdata with appropriate register values
+  wire [31:0] wdata [7:0];
+  wire        wen   [7:0];
+  wire [3:0]  waddr [7:0];
+  wire [3:0]  raddr [7:0];
+  genvar i;
+  generate
+    for(i = 0 ; i < 8 ; i = i + 1) begin: gen_ports
+      assign wdata[i] = rf_wdata[32*i +: 32];
+      assign wen[i]   = rf_wen[i];
+      assign waddr[i] = rf_waddr[4*i +: 4];
+      assign raddr[i] = rf_raddr[4*i +: 4];
+      // TODO will this compile?
+      assign rf_rdata[32*i +: 32] = raddr[i] == 0 ? casr_r : 
+        raddr[i] == 1 ? basr_r : 
+        raddr[i] == 2 ? rasr_r : reg_file[raddr[i]];
+    end
+  endgenerate
+
+  integer j;
+  // Write to the register file
+  always @(posedge clk) begin
+    for(j = 0 ; j < 8 ; j = j+1) begin: regfile_write
+      if(wen[j])
+        reg_file[waddr[j]] <= wdata[j];
+    end
+  end
+  
+  // DDR4 8-burst write data register
+  reg [511:0] wide_reg;
+  always @(posedge clk) begin
+    // TODO this probably won't compile
+    if(rf_wide_wen)
+      wide_reg[rf_wide_offset*32 +: 32] <= wdata[0];
+  end
+ 
+  assign rf_wide_data = wide_reg; 
+
+endmodule