Changeset 84 for trunk/MultiChannelUSB/uwt_bior31.v

Timestamp:

Dec 21, 2009, 5:09:06 PM (15 years ago)

Author:

demin

Message:

improve timings in all components

File:

• trunk/MultiChannelUSB/uwt_bior31.v (modified) (6 diffs)

trunk/MultiChannelUSB/uwt_bior31.v

@@ -16 +16 @@
         localparam      index2          =       2 << (L - 1);
         localparam      index3          =       3 << (L - 1);
-        localparam      peak_index      =       ((3 << (L - 1)) + 1) >> 1;
+        localparam      peak_index      =       ((index3 + 1) >> 1) + 1;
         localparam      peak_shift      =       ((L - 1) << 1) + (L - 1);
         localparam      zero            =       32'h80000000;
@@ -26 +26 @@
         reg             [31:0]  a_reg, a_next;
         reg             [31:0]  peak_reg, peak_next;
+
+        reg             [31:0]  tmp1_reg, tmp1_next;
+        reg             [31:0]  tmp2_reg, tmp2_next;
+
+        reg                             less_reg, less_next;
+        reg                             more_reg, more_next;
 
         reg             [1:0]   flag_reg;
@@ -39 +45 @@
                         peak_reg <= 0;
                         flag_reg <= 0;
+                        tmp1_reg <= 0;
+                        tmp2_reg <= 0;
+                        less_reg <= 1'b0;
+                        more_reg <= 1'b0;
 
                         for(i = 0; i <= index3; i = i + 1)
@@ -51 +61 @@
                         peak_reg <= peak_next;
                         
-                        flag_reg[0] <= (d_reg > zero) & (d_next <= zero);
-                        flag_reg[1] <= (d_reg < zero) & (d_next >= zero);
-        
+                        tmp1_reg <= tmp1_next;
+                        tmp2_reg <= tmp2_next;
+                        less_reg <= less_next;
+                        more_reg <= more_next;
+
+                        flag_reg[0] <= (more_reg) & (~more_next);
+                        flag_reg[1] <= (less_reg) & (~less_next);
+                        
                         // Tapped delay line: shift one
                         for(i = 0; i < index3; i = i + 1)
@@ -70 +85 @@
                 // The coefficients are [1, 3, -3, -1] and [1, 3, 3, 1]
 
+                tmp1_next = tap[index3] + {tap[index2][30:0], 1'b0} + tap[index2];
+                tmp2_next = {tap[index1][30:0], 1'b0} + tap[index1] + tap[0];
+                
+                d_next = zero - tmp1_reg + tmp2_reg;
+                a_next = tmp1_reg + tmp2_reg;
+                
+                more_next = (d_reg > zero);
+                less_next = (d_reg < zero);
+
+/*              
                 d_next = zero - (tap[index3])
                            - (tap[index2] << 1) - tap[index2]
@@ -76 +101 @@
                 
                 a_next = (tap[index3])
-                           + (tap[index2] << 1) + tap[index2]
+                           + {tap[index2] << 1} + tap[index2]
                            + (tap[index1] << 1) + tap[index1]
                            + (tap[0]);
-
+*/
                 peak_next = (tap[peak_index] >> peak_shift);
         end