add new crossbar

src/crossbars/blocking_with_override.v

@@ -0,0 +1,84 @@
+`ifndef PROJECT_CROSSBAR_V
+`define PROJECT_CROSSBAR_V 
+
+//Crossbar in Verilog
+
+module crossbars_BlockingWithOverride #(
+  parameter int BIT_WIDTH = 32,
+  parameter int N_INPUTS = 2,
+  parameter int N_OUTPUTS = 2,
+  localparam int CONTROL_BIT_WIDTH = $clog2(N_INPUTS * N_OUTPUTS)
+) (
+  input  logic [BIT_WIDTH - 1:0] recv_msg[N_INPUTS],
+  input  logic                   recv_val[N_INPUTS],
+  output logic                   recv_rdy[N_INPUTS],
+
+  output logic [BIT_WIDTH - 1:0] send_msg[N_OUTPUTS],
+  output logic                   send_val[N_OUTPUTS],
+  input  logic                   send_rdy[N_OUTPUTS],
+
+  input logic input_override,
+  input logic output_override,
+
+  input logic reset,
+  input logic clk,
+
+  input  logic [CONTROL_BIT_WIDTH - 1:0] control,
+  input  logic                           control_val,
+  output logic                           control_rdy
+);
+
+  logic [CONTROL_BIT_WIDTH - 1:0] stored_control;
+  logic [$clog2(N_INPUTS)  - 1:0] input_sel;
+  logic [$clog2(N_OUTPUTS) - 1:0] output_sel;
+
+  always_ff @(posedge clk) begin
+    if (reset) begin
+      stored_control <= 0;
+    end else if (control_val) begin
+      stored_control <= control;
+    end else begin
+      stored_control <= stored_control;
+    end
+  end
+
+  assign control_rdy = 1;
+
+
+
+  assign input_sel = stored_control[CONTROL_BIT_WIDTH-1:CONTROL_BIT_WIDTH-$clog2(N_INPUTS)];
+
+  assign output_sel = stored_control[CONTROL_BIT_WIDTH-$clog2(
+      N_INPUTS
+  )-1 : CONTROL_BIT_WIDTH-$clog2(
+      N_INPUTS
+  )-$clog2(
+      N_OUTPUTS
+  )];
+
+  always_comb begin
+    for (int i = 0; i < N_OUTPUTS; i = i + 1) begin
+      /* verilator lint_off WIDTH */
+      if ((i != output_sel)) begin
+        /* verilator lint_on WIDTH */
+        send_msg[i] = 0;
+        send_val[i] = 0;
+      end else begin
+        send_msg[i] = recv_msg[input_sel];
+        send_val[i] = recv_val[input_sel];
+      end
+    end
+    for (int i = 0; i < N_INPUTS; i = i + 1) begin
+      /* verilator lint_off WIDTH */
+      if ((i != input_sel)) begin
+        /* verilator lint_on WIDTH */
+        recv_rdy[i] = 0;
+      end else begin
+        recv_rdy[i] = send_rdy[output_sel];
+      end
+    end
+  end
+
+endmodule
+
+`endif