fpga/testbed_lo_read.v

   1 `include "lo_read.v"
   2 /*
   3         pck0                    - input main 24Mhz clock (PLL / 4)
   4         [7:0] adc_d             - input data from A/D converter
   5         lo_is_125khz    - input freq selector (1=125Khz, 0=136Khz)
   6
   7         pwr_lo                  - output to coil drivers (ssp_clk / 8)
   8         adc_clk                 - output A/D clock signal
   9         ssp_frame               - output SSS frame indicator (goes high while the 8 bits are shifted)
  10         ssp_din                 - output SSP data to ARM (shifts 8 bit A/D value serially to ARM MSB first)
  11         ssp_clk                 - output SSP clock signal 1Mhz/1.09Mhz (pck0 / 2*(11+lo_is_125khz) )
  12
  13         ck_1356meg              - input unused
  14         ck_1356megb             - input unused
  15         ssp_dout                - input unused
  16         cross_hi                - input unused
  17         cross_lo                - input unused
  18
  19         pwr_hi                  - output unused, tied low
  20         pwr_oe1                 - output unused, undefined
  21         pwr_oe2                 - output unused, undefined
  22         pwr_oe3                 - output unused, undefined
  23         pwr_oe4                 - output unused, undefined
  24         dbg                             - output alias for adc_clk
  25 */
  26
  27 module testbed_lo_read;
  28         reg  pck0;
  29         reg  [7:0] adc_d;
  30         reg  lo_is_125khz;
  31         reg [15:0] divisor;
  32
  33         wire pwr_lo;
  34         wire adc_clk;
  35         wire ck_1356meg;
  36         wire ck_1356megb;
  37         wire ssp_frame;
  38         wire ssp_din;
  39         wire ssp_clk;
  40         reg ssp_dout;
  41         wire pwr_hi;
  42         wire pwr_oe1;
  43         wire pwr_oe2;
  44         wire pwr_oe3;
  45         wire pwr_oe4;
  46         wire cross_lo;
  47         wire cross_hi;
  48         wire dbg;
  49
  50         lo_read #(5,10) dut(
  51         .pck0(pck0),
  52         .ck_1356meg(ck_1356meg),
  53         .ck_1356megb(ck_1356megb),
  54         .pwr_lo(pwr_lo),
  55         .pwr_hi(pwr_hi),
  56         .pwr_oe1(pwr_oe1),
  57         .pwr_oe2(pwr_oe2),
  58         .pwr_oe3(pwr_oe3),
  59         .pwr_oe4(pwr_oe4),
  60         .adc_d(adc_d),
  61         .adc_clk(adc_clk),
  62         .ssp_frame(ssp_frame),
  63         .ssp_din(ssp_din),
  64         .ssp_dout(ssp_dout),
  65         .ssp_clk(ssp_clk),
  66         .cross_hi(cross_hi),
  67         .cross_lo(cross_lo),
  68         .dbg(dbg),
  69         .lo_is_125khz(lo_is_125khz),
  70         .divisor(divisor)
  71         );
  72
  73         integer idx, i, adc_val=8;
  74
  75         // main clock
  76         always #5 pck0 = !pck0;
  77
  78         task crank_dut;
  79         begin
  80                 @(posedge adc_clk) ;
  81                 adc_d = adc_val;
  82                 adc_val = (adc_val *2) + 53;
  83         end
  84         endtask
  85
  86         initial begin
  87
  88                 // init inputs
  89                 pck0 = 0;
  90                 adc_d = 0;
  91                 ssp_dout = 0;
  92                 lo_is_125khz = 1;
  93                 divisor = 255;  //min 16, 95=125Khz, max 255
  94
  95                 // simulate 4 A/D cycles at 125Khz
  96                 for (i = 0 ;  i < 8 ;  i = i + 1) begin
  97                         crank_dut;
  98                 end
  99                 $finish;
 100         end
 101 endmodule // main