[Commit-gnuradio] r7174 - usrp2/trunk/fpga/models

[matt]

Author: matt
Date: 2007-12-14 01:56:50 -0700 (Fri, 14 Dec 2007)
New Revision: 7174

Modified:
   usrp2/trunk/fpga/models/adc_model.v
   usrp2/trunk/fpga/models/math_real.v
Log:
speedups


Modified: usrp2/trunk/fpga/models/adc_model.v
===================================================================
--- usrp2/trunk/fpga/models/adc_model.v 2007-12-14 08:24:26 UTC (rev 7173)
+++ usrp2/trunk/fpga/models/adc_model.v 2007-12-14 08:56:50 UTC (rev 7174)
@@ -21,19 +21,17 @@
    assign     adc_b = adc_oe_b ? adc_b_int : 14'bz;
    assign     adc_ovf_b = adc_oe_b ? 1'b0 : 1'bz;
    
-   real phase = 0;
+   real       phase = 0;
+   real       sample_rate = 100000000;
+   real       freq = 330000/sample_rate;     // 330 kHz
 
-   real my_e = math.MATH_E;
-   
-   real sample_rate = 100000000;
-   real freq = 330000/sample_rate;     // 330 kHz
-   
+   real       scale = math.pow(2,13)-2;
    always @(posedge clk)
      begin
        if(adc_on_a)
-         adc_a_int <= 
$rtoi(math.round(math.sin(phase*math.MATH_2_PI)*(math.pow(2,13)-1))) ;
+         adc_a_int <= $rtoi(math.round(math.sin(phase*math.MATH_2_PI)*scale)) ;
        if(adc_on_b)
-         adc_b_int <= 
$rtoi(math.round(math.cos(phase*math.MATH_2_PI)*(math.pow(2,13)-1))) ;
+         adc_b_int <= $rtoi(math.round(math.cos(phase*math.MATH_2_PI)*scale)) ;
        if(phase > 1)
          phase <= phase + freq - 1;
        else

Modified: usrp2/trunk/fpga/models/math_real.v
===================================================================
--- usrp2/trunk/fpga/models/math_real.v 2007-12-14 08:24:26 UTC (rev 7173)
+++ usrp2/trunk/fpga/models/math_real.v 2007-12-14 08:56:50 UTC (rev 7174)
@@ -26,7 +26,7 @@
 
    // The number of iterations to do for the Taylor series approximations
    localparam EXPLOG_ITERATIONS =  19;
-   localparam COS_ITERATIONS    =  13;
+   localparam COS_ITERATIONS    =  8;
    
    /* Conversion Routines */