em4x50read (work in progress)

[proxmark3-svn] / fpga / fpga.v

//-----------------------------------------------------------------------------\r
// The FPGA is responsible for interfacing between the A/D, the coil drivers,\r
// and the ARM. In the low-frequency modes it passes the data straight\r
// through, so that the ARM gets raw A/D samples over the SSP. In the high-\r
// frequency modes, the FPGA might perform some demodulation first, to\r
// reduce the amount of data that we must send to the ARM.\r
//\r
// I am not really an FPGA/ASIC designer, so I am sure that a lot of this\r
// could be improved.\r
//\r
// Jonathan Westhues, March 2006\r
// Added ISO14443-A support by Gerhard de Koning Gans, April 2008\r
//-----------------------------------------------------------------------------\r
\r
`include "lo_read.v"\r
`include "lo_simulate.v"\r
`include "hi_read_tx.v"\r
`include "hi_read_rx_xcorr.v"\r
`include "hi_simulate.v"\r
`include "hi_iso14443a.v"\r
`include "util.v"\r
\r
module fpga(\r
	spcki, miso, mosi, ncs,\r
	pck0i, ck_1356meg, ck_1356megb,\r
	pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4,\r
	adc_d, adc_clk, adc_noe,\r
	ssp_frame, ssp_din, ssp_dout, ssp_clk,\r
	cross_hi, cross_lo,\r
	dbg\r
);\r
	input spcki, mosi, ncs;\r
	output miso;\r
	input pck0i, ck_1356meg, ck_1356megb;\r
	output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4;\r
	input [7:0] adc_d;\r
	output adc_clk, adc_noe;\r
	input ssp_dout;\r
	output ssp_frame, ssp_din, ssp_clk;\r
	input cross_hi, cross_lo;\r
	output dbg;\r
\r
//assign pck0 = pck0i;\r
	IBUFG #(.IOSTANDARD("DEFAULT") ) pck0b(\r
		.O(pck0),\r
		.I(pck0i)\r
	);\r
//assign spck = spcki;\r
	IBUFG #(.IOSTANDARD("DEFAULT") ) spckb(\r
		.O(spck),\r
		.I(spcki)\r
	);\r
//-----------------------------------------------------------------------------\r
// The SPI receiver. This sets up the configuration word, which the rest of\r
// the logic looks at to determine how to connect the A/D and the coil\r
// drivers (i.e., which section gets it). Also assign some symbolic names\r
// to the configuration bits, for use below.\r
//-----------------------------------------------------------------------------\r
\r
reg [15:0] shift_reg;\r
reg [7:0] divisor;\r
reg [7:0] conf_word;\r
\r
// We switch modes between transmitting to the 13.56 MHz tag and receiving\r
// from it, which means that we must make sure that we can do so without\r
// glitching, or else we will glitch the transmitted carrier.\r
always @(posedge ncs)\r
begin\r
	case(shift_reg[15:12])\r
		4'b0001: conf_word <= shift_reg[7:0];\r
		4'b0010: divisor <= shift_reg[7:0];\r
	endcase\r
end\r
\r
always @(posedge spck)\r
begin\r
	if(~ncs)\r
	begin\r
		shift_reg[15:1] <= shift_reg[14:0];\r
		shift_reg[0] <= mosi;\r
	end\r
end\r
\r
wire [2:0] major_mode;\r
assign major_mode = conf_word[7:5];\r
\r
// For the low-frequency configuration:\r
wire lo_is_125khz;\r
assign lo_is_125khz = conf_word[3];\r
\r
// For the high-frequency transmit configuration: modulation depth, either\r
// 100% (just quite driving antenna, steady LOW), or shallower (tri-state\r
// some fraction of the buffers)\r
wire hi_read_tx_shallow_modulation;\r
assign hi_read_tx_shallow_modulation = conf_word[0];\r
\r
// For the high-frequency receive correlator: frequency against which to\r
// correlate.\r
wire hi_read_rx_xcorr_848;\r
assign hi_read_rx_xcorr_848 = conf_word[0];\r
// and whether to drive the coil (reader) or just short it (snooper)\r
wire hi_read_rx_xcorr_snoop;\r
assign hi_read_rx_xcorr_snoop = conf_word[1];\r
\r
// For the high-frequency simulated tag: what kind of modulation to use.\r
wire [2:0] hi_simulate_mod_type;\r
assign hi_simulate_mod_type = conf_word[2:0];\r
\r
//-----------------------------------------------------------------------------\r
// And then we instantiate the modules corresponding to each of the FPGA's\r
// major modes, and use muxes to connect the outputs of the active mode to\r
// the output pins.\r
//-----------------------------------------------------------------------------\r
\r
lo_read lr(\r
	pck0, ck_1356meg, ck_1356megb,\r
	lr_pwr_lo, lr_pwr_hi, lr_pwr_oe1, lr_pwr_oe2, lr_pwr_oe3, lr_pwr_oe4,\r
	adc_d, lr_adc_clk,\r
	lr_ssp_frame, lr_ssp_din, ssp_dout, lr_ssp_clk,\r
	cross_hi, cross_lo,\r
	lr_dbg,\r
	lo_is_125khz, divisor\r
);\r
\r
lo_simulate ls(\r
	pck0, ck_1356meg, ck_1356megb,\r
	ls_pwr_lo, ls_pwr_hi, ls_pwr_oe1, ls_pwr_oe2, ls_pwr_oe3, ls_pwr_oe4,\r
	adc_d, ls_adc_clk,\r
	ls_ssp_frame, ls_ssp_din, ssp_dout, ls_ssp_clk,\r
	cross_hi, cross_lo,\r
	ls_dbg\r
);\r
\r
hi_read_tx ht(\r
	pck0, ck_1356meg, ck_1356megb,\r
	ht_pwr_lo, ht_pwr_hi, ht_pwr_oe1, ht_pwr_oe2, ht_pwr_oe3, ht_pwr_oe4,\r
	adc_d, ht_adc_clk,\r
	ht_ssp_frame, ht_ssp_din, ssp_dout, ht_ssp_clk,\r
	cross_hi, cross_lo,\r
	ht_dbg,\r
	hi_read_tx_shallow_modulation\r
);\r
\r
hi_read_rx_xcorr hrxc(\r
	pck0, ck_1356meg, ck_1356megb,\r
	hrxc_pwr_lo, hrxc_pwr_hi, hrxc_pwr_oe1, hrxc_pwr_oe2, hrxc_pwr_oe3,	hrxc_pwr_oe4,\r
	adc_d, hrxc_adc_clk,\r
	hrxc_ssp_frame, hrxc_ssp_din, ssp_dout, hrxc_ssp_clk,\r
	cross_hi, cross_lo,\r
	hrxc_dbg,\r
	hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop\r
);\r
\r
hi_simulate hs(\r
	pck0, ck_1356meg, ck_1356megb,\r
	hs_pwr_lo, hs_pwr_hi, hs_pwr_oe1, hs_pwr_oe2, hs_pwr_oe3, hs_pwr_oe4,\r
	adc_d, hs_adc_clk,\r
	hs_ssp_frame, hs_ssp_din, ssp_dout, hs_ssp_clk,\r
	cross_hi, cross_lo,\r
	hs_dbg,\r
	hi_simulate_mod_type\r
);\r
\r
hi_iso14443a hisn(\r
	pck0, ck_1356meg, ck_1356megb,\r
	hisn_pwr_lo, hisn_pwr_hi, hisn_pwr_oe1, hisn_pwr_oe2, hisn_pwr_oe3,	hisn_pwr_oe4,\r
	adc_d, hisn_adc_clk,\r
	hisn_ssp_frame, hisn_ssp_din, ssp_dout, hisn_ssp_clk,\r
	cross_hi, cross_lo,\r
	hisn_dbg,\r
	hi_simulate_mod_type\r
);\r
\r
// Major modes:\r
//   000 --  LF reader (generic)\r
//   001 --  LF simulated tag (generic)\r
//   010 --  HF reader, transmitting to tag; modulation depth selectable\r
//   011 --  HF reader, receiving from tag, correlating as it goes; frequency selectable\r
//   100 --  HF simulated tag\r
//   101 --  HF ISO14443-A\r
//   110 --  unused\r
//   111 --  everything off\r
\r
mux8 mux_ssp_clk	(major_mode, ssp_clk,   lr_ssp_clk,   ls_ssp_clk,   ht_ssp_clk,   hrxc_ssp_clk,   hs_ssp_clk,   hisn_ssp_clk,   1'b0, 1'b0);\r
mux8 mux_ssp_din	(major_mode, ssp_din,   lr_ssp_din,   ls_ssp_din,   ht_ssp_din,   hrxc_ssp_din,   hs_ssp_din,   hisn_ssp_din,   1'b0, 1'b0);\r
mux8 mux_ssp_frame	(major_mode, ssp_frame, lr_ssp_frame, ls_ssp_frame, ht_ssp_frame, hrxc_ssp_frame, hs_ssp_frame, hisn_ssp_frame, 1'b0, 1'b0);\r
mux8 mux_pwr_oe1	(major_mode, pwr_oe1,   lr_pwr_oe1,   ls_pwr_oe1,   ht_pwr_oe1,   hrxc_pwr_oe1,   hs_pwr_oe1,   hisn_pwr_oe1,   1'b0, 1'b0);\r
mux8 mux_pwr_oe2	(major_mode, pwr_oe2,   lr_pwr_oe2,   ls_pwr_oe2,   ht_pwr_oe2,   hrxc_pwr_oe2,   hs_pwr_oe2,   hisn_pwr_oe2,   1'b0, 1'b0);\r
mux8 mux_pwr_oe3	(major_mode, pwr_oe3,   lr_pwr_oe3,   ls_pwr_oe3,   ht_pwr_oe3,   hrxc_pwr_oe3,   hs_pwr_oe3,   hisn_pwr_oe3,   1'b0, 1'b0);\r
mux8 mux_pwr_oe4	(major_mode, pwr_oe4,   lr_pwr_oe4,   ls_pwr_oe4,   ht_pwr_oe4,   hrxc_pwr_oe4,   hs_pwr_oe4,   hisn_pwr_oe4,   1'b0, 1'b0);\r
mux8 mux_pwr_lo		(major_mode, pwr_lo,    lr_pwr_lo,    ls_pwr_lo,    ht_pwr_lo,    hrxc_pwr_lo,    hs_pwr_lo,    hisn_pwr_lo,    1'b0, 1'b0);\r
mux8 mux_pwr_hi		(major_mode, pwr_hi,    lr_pwr_hi,    ls_pwr_hi,    ht_pwr_hi,    hrxc_pwr_hi,    hs_pwr_hi,    hisn_pwr_hi,    1'b0, 1'b0);\r
mux8 mux_adc_clk	(major_mode, adc_clk,   lr_adc_clk,   ls_adc_clk,   ht_adc_clk,   hrxc_adc_clk,   hs_adc_clk,   hisn_adc_clk,   1'b0, 1'b0);\r
mux8 mux_dbg		(major_mode, dbg,       lr_dbg,       ls_dbg,       ht_dbg,       hrxc_dbg,       hs_dbg,       hisn_dbg,       1'b0, 1'b0);\r
\r
// In all modes, let the ADC's outputs be enabled.\r
assign adc_noe = 1'b0;\r
\r
endmodule\r