/*
 * This module encapsulates the application function of our board:
 * going from FT2232D to target interfaces.
 */

module application_block (GND, P_3V3, P_2V8, ADBUS, ACBUS, BDBUS);

input GND, P_3V3, P_2V8;

inout [7:0] ADBUS, BDBUS;
inout [3:0] ACBUS;

/* target interface wires */

wire JTAG_TCK, JTAG_TDI, JTAG_TDO, JTAG_TMS;
wire nTESTRESET;
wire UART_TxD, UART_RxD;

target_if target_if (	.GND(GND),
			.JTAG_TCK(JTAG_TCK),
			.JTAG_TDI(JTAG_TDI),
			.JTAG_TDO(JTAG_TDO),
			.JTAG_TMS(JTAG_TMS),
			.nTESTRESET(nTESTRESET),
		  	.nEMU[0](ACBUS[2]),
		  	.nEMU[1](ACBUS[3]),
			.UART_TxD(UART_TxD),
			.UART_RxD(UART_RxD)
	);

/* output buffers */

buffer_ic_common output_buf_common (.Vcc(P_2V8), .GND(GND));
capacitor output_buf_bypass_cap (P_2V8, GND);

buffer_ic_slot buf_JTAG_TCK (.A(ADBUS[0]), .Y(JTAG_TCK), .nOE(ADBUS[5]));
buffer_ic_slot buf_JTAG_TDI (.A(ADBUS[1]), .Y(JTAG_TDI), .nOE(ADBUS[5]));
buffer_ic_slot buf_JTAG_TMS (.A(ADBUS[3]), .Y(JTAG_TMS), .nOE(ADBUS[5]));

buffer_ic_slot buf_UART_TxD (.A(BDBUS[0]), .Y(UART_TxD), .nOE(GND));

/* input buffers */

buffer_ic_common input_buf_common (.Vcc(P_3V3), .GND(GND));
capacitor input_buf_bypass_cap (P_3V3, GND);

buffer_ic_slot buf_JTAG_TDO (.A(JTAG_TDO), .Y(ADBUS[2]), .nOE(ADBUS[6]));
buffer_ic_slot buf_UART_RxD (.A(UART_RxD), .Y(BDBUS[1]), .nOE(GND));

/* input pull-up resistors */

resistor JTAG_TDO_pullup (JTAG_TDO, P_2V8);
resistor UART_RxD_pullup (UART_RxD, P_2V8);

/* reset signal driver */

od_buffer reset_driver (.GND(GND), .Vcc(P_3V3), .A(ADBUS[7]), .Y(nTESTRESET));
capacitor reset_driver_bypass_cap (P_3V3, GND);

/* pull-up resistors on control lines */

resistor ADBUS5_pullup (ADBUS[5], P_3V3);
resistor ADBUS6_pullup (ADBUS[6], P_3V3);
resistor ADBUS7_pullup (ADBUS[7], P_3V3);

endmodule