ramblings

ChaCha20_Poly1305_64/poly1305_timing_test/mult_timing_test.sv

@@ -0,0 +1,42 @@
+module mult_timing_test(
+    input i_clk,
+
+    input logic [132:0] data_a,
+    input logic [127:0] data_b,
+    
+    output logic [260:0] data_z
+);
+
+logic [132:0] data_a_reg;
+logic [127:0] data_b_reg;
+
+
+logic [260:0] partial_result [7];
+
+logic [260:0] data_z_temp_1[4];
+logic [260:0] data_z_temp_2_0, data_z_temp_2_1;
+
+always @(posedge i_clk) begin
+    data_a_reg <= data_a;
+    data_b_reg <= data_b;
+
+    for (int i = 0; i < 7; i++) begin
+        partial_result[i] <= data_a_reg[i*18 +: 18] * data_b_reg;
+    end
+    
+
+    data_z_temp_1[0] <= (partial_result[0] << (19*0)) + (partial_result[1] << (19*1));
+    data_z_temp_1[1] <= (partial_result[2] << (19*0)) + (partial_result[3] << (19*1));
+    data_z_temp_1[2] <= (partial_result[4] << (19*0)) + (partial_result[5] << (19*1));
+    data_z_temp_1[3] <= (partial_result[6] << (19*0));
+
+    data_z_temp_2_0 <= data_z_temp_1[0] + (data_z_temp_1[1] << (19*2));
+    data_z_temp_2_1 <= data_z_temp_1[2] + (data_z_temp_1[3] << (19*2));
+
+    data_z <= data_z_temp_2_0 + data_z_temp_2_1;
+
+    // data_z <= data_z_temp_2[0] + (data_z_temp_2[1] << (19*4));
+
+end
+
+endmodule