[Commit-gnuradio] r8525 - usrp2/trunk/fpga/top/u2_rev2

[matt]

Author: matt
Date: 2008-05-28 18:33:17 -0600 (Wed, 28 May 2008)
New Revision: 8525

Modified:
   usrp2/trunk/fpga/top/u2_rev2/u2_rev2.v
Log:
use negedge clocks for adc inputs.  Probably not necessary.


Modified: usrp2/trunk/fpga/top/u2_rev2/u2_rev2.v
===================================================================
--- usrp2/trunk/fpga/top/u2_rev2/u2_rev2.v      2008-05-29 00:32:12 UTC (rev 
8524)
+++ usrp2/trunk/fpga/top/u2_rev2/u2_rev2.v      2008-05-29 00:33:17 UTC (rev 
8525)
@@ -184,19 +184,22 @@
    reg [13:0]   adc_a_reg1, adc_b_reg1, adc_a_reg2, adc_b_reg2;
    reg                  adc_ovf_a_reg1, adc_ovf_a_reg2, adc_ovf_b_reg1, 
adc_ovf_b_reg2;
 
+   always @(negedge dsp_clk)
+     begin
+       adc_a_reg1 <= adc_a;
+       adc_b_reg1 <= adc_b;
+       adc_ovf_a_reg1 <= adc_ovf_a;
+       adc_ovf_b_reg1 <= adc_ovf_b;
+     end
+   
    always @(posedge dsp_clk)
      begin
-       adc_a_reg1 <= adc_a;
        adc_a_reg2 <= adc_a_reg1;
-       adc_b_reg1 <= adc_b;
        adc_b_reg2 <= adc_b_reg1;
-       adc_ovf_a_reg1 <= adc_ovf_a;
        adc_ovf_a_reg2 <= adc_ovf_a_reg1;
-       adc_ovf_b_reg1 <= adc_ovf_b;
        adc_ovf_b_reg2 <= adc_ovf_b_reg1;
      end // always @ (posedge dsp_clk)
 
-
    // Handle Clocks
    DCM DCM_INST (.CLKFB(dsp_clk), 
                  .CLKIN(clk_muxed),