new priority encoder

core/priority_encoder.sv

@@ -0,0 +1,68 @@
+/*
+ * Copyright © 2021 Eric Matthews,  Lesley Shannon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Initial code developed under the supervision of Dr. Lesley Shannon,
+ * Reconfigurable Computing Lab, Simon Fraser University.
+ *
+ * Author(s):
+ *             Eric Matthews <ematthew@sfu.ca>
+ */
+
+////////////////////////////////////////////////////
+//Highest Priority for: Index Zero
+//Look-up Table based
+//Max width of 12
+////////////////////////////////////////////////////
+module priority_encoder
+    #(
+        parameter WIDTH = 4
+    )
+    (
+        input logic [WIDTH-1:0] priority_vector,
+        output logic [(WIDTH == 1) ? 0 : ($clog2(WIDTH)-1) : 0] encoded_result
+    );
+    ////////////////////////////////////////////////////
+    //Width Check
+    if (WIDTH > 12)
+        $error("Max priority encoder width exceeded!");
+
+    localparam LOG2_WIDTH = $clog2(WIDTH);
+    ////////////////////////////////////////////////////
+    //Implementation
+
+    generate
+        if (WIDTH == 1)
+            assign encoded_result = 0;
+        else begin
+
+            //Table generation for priority encoder
+            function [2**WIDTH-1:0][LOG2_WIDTH-1 : 0] table_gen ();
+                for (int i = 0; i < 2**WIDTH; i++) begin //Loop through all memory addresses
+                    table_gen[i] = LOG2_WIDTH'(WIDTH - 1);//Initialize to lowest priority
+                    for (int j = (WIDTH - 2); j >= 0; j--) begin//Check each bit in increasing priority
+                        if (i[j])//If bit is set update table value with that bit's index
+                            table_gen[i] = LOG2_WIDTH'(j);
+                    end
+                end
+            endfunction
+
+            //Initialize Table
+            const logic [2**WIDTH-1:0][LOG2_WIDTH-1 : 0] encoder_rom = table_gen();
+
+            assign encoded_result = encoder_rom[priority_vector];
+        end
+    endgenerate
+
+endmodule

tools/taiga_compile_order

@@ -30,6 +30,7 @@ core/one_hot_occupancy.sv
 core/binary_occupancy.sv 
 core/taiga_fifo.sv  
 core/shift_counter.sv
+core/priority_encoder.sv
 
 core/set_clr_reg_with_rst.sv