Changeset 158

Timestamp:

Jan 5, 2012, 3:32:07 PM (13 years ago)

Author:

demin

Message:

increase lfsr length

File:

• sandbox/MultiChannelUSB/filter.v (modified) (5 diffs)

sandbox/MultiChannelUSB/filter.v

@@ -10 +10 @@
         );
         
-        localparam      widthr  =       width + 7;
+        localparam      widthr  =       width + 8;
         /*
         5-bit LFSR with additional bits to keep track of previous values
         */
-        reg             [23:0]                          int_lfsr_reg, int_lfsr_next;
+        reg             [31:0]                          int_lfsr_reg, int_lfsr_next;
 
         reg                                                     int_wren_reg, int_wren_next;
@@ -96 +96 @@
                 .sel(int_chan_next),
                 .data({
-                        1'b1, int_lfsr_reg[16+4:16],
-                        1'b0, int_lfsr_reg[4+4:4]}),
+                        1'b1, int_lfsr_reg[20+4:20],
+                        1'b0, int_lfsr_reg[5+4:5]}),
                 .result(int_addr_wire));                            
 
@@ -117 +117 @@
                                 int_data_reg[i] <= {(size*widthr){1'b0}};
                         end
-                        int_lfsr_reg <= 24'd0;
+                        int_lfsr_reg <= 32'd0;
                 end
                 else
@@ -180 +180 @@
                                         int_flag_next = 1'b0;
                                         int_chan_next = 1'b0;
-                                        int_lfsr_next = 24'h0722BD;
+                                        int_lfsr_next = 32'h0722BDA6;
                                         int_case_next = 'd2;
                                 end
@@ -200 +200 @@
                                         acc_data_next[1] = int_data_reg[0];
                                         
-                                        int_lfsr_next = {int_lfsr_reg[22:0], int_lfsr_reg[2] ~^ int_lfsr_reg[4]};
+                                        int_lfsr_next = {int_lfsr_reg[30:0], int_lfsr_reg[2] ~^ int_lfsr_reg[4]};
 
                                         int_case_next = 'd3;