X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/802a36162a7a5452ad1b276399087df11b46ccd1..f66021cf4875fed1ae5b6767f61197d3896e224e:/fpga/lo_simulate.v?ds=sidebyside diff --git a/fpga/lo_simulate.v b/fpga/lo_simulate.v index 9e3cd50a..57e602a2 100644 --- a/fpga/lo_simulate.v +++ b/fpga/lo_simulate.v @@ -1,56 +1,56 @@ -//----------------------------------------------------------------------------- -// The way that we connect things in low-frequency simulation mode. In this -// case just pass everything through to the ARM, which can bit-bang this -// (because it is so slow). -// -// Jonathan Westhues, April 2006 -//----------------------------------------------------------------------------- - -module lo_simulate( - pck0, ck_1356meg, ck_1356megb, - pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4, - adc_d, adc_clk, - ssp_frame, ssp_din, ssp_dout, ssp_clk, - cross_hi, cross_lo, +//----------------------------------------------------------------------------- +// The way that we connect things in low-frequency simulation mode. In this +// case just pass everything through to the ARM, which can bit-bang this +// (because it is so slow). +// +// Jonathan Westhues, April 2006 +//----------------------------------------------------------------------------- + +module lo_simulate( + pck0, ck_1356meg, ck_1356megb, + pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4, + adc_d, adc_clk, + ssp_frame, ssp_din, ssp_dout, ssp_clk, + cross_hi, cross_lo, dbg, - divisor -); - input pck0, ck_1356meg, ck_1356megb; - output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4; - input [7:0] adc_d; - output adc_clk; - input ssp_dout; - output ssp_frame, ssp_din, ssp_clk; - input cross_hi, cross_lo; + divisor +); + input pck0, ck_1356meg, ck_1356megb; + output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4; + input [7:0] adc_d; + output adc_clk; + input ssp_dout; + output ssp_frame, ssp_din, ssp_clk; + input cross_hi, cross_lo; output dbg; - input [7:0] divisor; - -// No logic, straight through. -assign pwr_oe3 = 1'b0; -assign pwr_oe1 = ssp_dout; -assign pwr_oe2 = ssp_dout; -assign pwr_oe4 = ssp_dout; -assign ssp_clk = cross_lo; -assign pwr_lo = 1'b0; -assign pwr_hi = 1'b0; -assign dbg = ssp_frame; + input [7:0] divisor; + +// No logic, straight through. +assign pwr_oe3 = 1'b0; +assign pwr_oe1 = ssp_dout; +assign pwr_oe2 = ssp_dout; +assign pwr_oe4 = ssp_dout; +assign ssp_clk = cross_lo; +assign pwr_lo = 1'b0; +assign pwr_hi = 1'b0; +assign dbg = ssp_frame; // Divide the clock to be used for the ADC reg [7:0] pck_divider; reg clk_state; - -always @(posedge pck0) -begin - if(pck_divider == divisor[7:0]) - begin + +always @(posedge pck0) +begin + if(pck_divider == divisor[7:0]) + begin pck_divider <= 8'd0; - clk_state = !clk_state; - end - else - begin - pck_divider <= pck_divider + 1; - end -end + clk_state = !clk_state; + end + else + begin + pck_divider <= pck_divider + 1; + end +end assign adc_clk = ~clk_state; @@ -61,8 +61,8 @@ reg is_high; reg is_low; reg output_state; -always @(posedge pck0) -begin +always @(posedge pck0) +begin if((pck_divider == 8'd7) && !clk_state) begin is_high = (adc_d >= 8'd200); is_low = (adc_d <= 8'd64); @@ -78,5 +78,6 @@ begin end assign ssp_frame = output_state; - -endmodule + +endmodule +