initial commit for open source NoC IP

rtl/util/priority_encoder.sv

@@ -0,0 +1,43 @@
+`ifndef __PRIORITY_ENCODER_SV__
+`define __PRIORITY_ENCODER_SV__
+module priority_encoder
+#(
+    parameter int unsigned SEL_WIDTH = 8,
+    localparam int unsigned SEL_ID_WIDHT = SEL_WIDTH > 1 ? $clog2(SEL_WIDTH) : 1
+)
+(
+    input logic[SEL_WIDTH-1:0] sel_i,
+    output logic id_vld_o,
+    output logic[SEL_ID_WIDHT-1:0] id_o
+);
+    
+    if(SEL_WIDTH == 1) begin
+
+        assign id_vld_o = sel_i;
+        assign id_o     = 1'b0;
+
+    end
+    else begin
+
+        logic [SEL_WIDTH-1:0] sel_mask;
+        logic [SEL_ID_WIDHT+1-1:0] sel_result; 
+        
+        assign sel_mask = ((~sel_i + 1'b1) & sel_i) - 1'b1;
+        
+        one_counter #(
+            .DATA_WIDTH(SEL_WIDTH)
+        ) one_counter_u (
+            .data_i(sel_mask),
+            .cnt_o(sel_result)
+        );
+        
+        assign id_o =  sel_result[SEL_ID_WIDHT-1:0];
+        assign id_vld_o = |sel_i;
+
+    end
+    
+    
+    
+endmodule : priority_encoder
+
+`endif