initial commit for open source NoC IP

rtl/util/select_two_from_n_valid.sv

@@ -0,0 +1,62 @@
+`ifndef __SELECT_TWO_FROM_N_VALID_SV__
+`define __SELECT_TWO_FROM_N_VALID_SV__
+module select_two_from_n_valid
+#(
+    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,
+    input  logic first_id_needed_vld_i,
+    input  logic second_id_needed_vld_i,
+    output logic first_id_vld_o,
+    output logic second_id_vld_o,
+    output logic[SEL_ID_WIDHT-1:0] first_id_o,
+    output logic[SEL_ID_WIDHT-1:0] second_id_o
+);
+genvar i;
+
+logic[SEL_WIDTH-1:0]    sel_rev;
+logic                   first_id_vld_mid;
+logic                   secondid_vld_mid;
+logic[SEL_ID_WIDHT-1:0] first_id_mid;
+logic[SEL_ID_WIDHT-1:0] second_id_mid, second_id_mid_comp;
+
+
+
+generate
+  for(i = 0; i < SEL_WIDTH; i++) begin: sel_rev_gen
+    assign sel_rev[i] = sel_i[SEL_WIDTH-1-i];
+  end
+endgenerate
+
+priority_encoder
+#(
+  .SEL_WIDTH    (SEL_WIDTH)
+)
+first_vld_sel_u
+(
+  .sel_i      (sel_i            ),
+  .id_vld_o   (first_id_vld_mid ),
+  .id_o       (first_id_mid     )
+);
+
+priority_encoder
+#(
+  .SEL_WIDTH    (SEL_WIDTH)
+)
+second_vld_sel_u
+(
+  .sel_i      (sel_rev          ),
+  .id_vld_o   (secondid_vld_mid ),
+  .id_o       (second_id_mid    )
+);
+assign second_id_mid_comp = SEL_ID_WIDHT'(SEL_WIDTH-1-second_id_mid);
+
+assign first_id_vld_o = first_id_vld_mid & first_id_needed_vld_i;
+assign second_id_vld_o = secondid_vld_mid & (~(first_id_mid == second_id_mid_comp) | ~first_id_needed_vld_i) & second_id_needed_vld_i;
+assign first_id_o     = first_id_mid;
+assign second_id_o    = second_id_mid_comp;
+
+endmodule
+`endif