FreeCalypso > hg > fc-small-hw

annotate fc-uja/schem+bom/vsrc/application_block.v @ 55:a2ce85275f63

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lunalcd[12]/README written
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 23 Jun 2021 08:23:10 +0000
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1 /*
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2 * This module encapsulates the application function of our board:
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3 * going from FT2232D to target interfaces.
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4 */
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6 module application_block (GND, P_3V3, P_2V8, ADBUS, ACBUS, BDBUS);
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8 input GND, P_3V3, P_2V8;
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10 inout [7:0] ADBUS, BDBUS;
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11 inout [3:0] ACBUS;
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13 /* target interface wires */
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15 wire JTAG_TCK, JTAG_TDI, JTAG_TDO, JTAG_TMS;
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16 wire nTESTRESET;
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17 wire UART_TxD, UART_RxD;
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19 target_if target_if ( .GND(GND),
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20 .JTAG_TCK(JTAG_TCK),
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21 .JTAG_TDI(JTAG_TDI),
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22 .JTAG_TDO(JTAG_TDO),
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23 .JTAG_TMS(JTAG_TMS),
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24 .nTESTRESET(nTESTRESET),
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25 .nEMU[0](ACBUS[2]),
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26 .nEMU[1](ACBUS[3]),
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27 .UART_TxD(UART_TxD),
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28 .UART_RxD(UART_RxD)
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29 );
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30
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31 /* output buffers */
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32
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33 buffer_ic_common output_buf_common (.Vcc(P_2V8), .GND(GND));
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34 capacitor output_buf_bypass_cap (P_2V8, GND);
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35
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36 buffer_ic_slot buf_JTAG_TCK (.A(ADBUS[0]), .Y(JTAG_TCK), .nOE(ADBUS[5]));
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37 buffer_ic_slot buf_JTAG_TDI (.A(ADBUS[1]), .Y(JTAG_TDI), .nOE(ADBUS[5]));
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38 buffer_ic_slot buf_JTAG_TMS (.A(ADBUS[3]), .Y(JTAG_TMS), .nOE(ADBUS[5]));
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39
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40 buffer_ic_slot buf_UART_TxD (.A(BDBUS[0]), .Y(UART_TxD), .nOE(GND));
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42 /* input buffers */
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43
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44 buffer_ic_common input_buf_common (.Vcc(P_3V3), .GND(GND));
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45 capacitor input_buf_bypass_cap (P_3V3, GND);
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46
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47 buffer_ic_slot buf_JTAG_TDO (.A(JTAG_TDO), .Y(ADBUS[2]), .nOE(ADBUS[6]));
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48 buffer_ic_slot buf_UART_RxD (.A(UART_RxD), .Y(BDBUS[1]), .nOE(GND));
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49
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50 /* input pull-up resistors */
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51
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52 resistor JTAG_TDO_pullup (JTAG_TDO, P_2V8);
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53 resistor UART_RxD_pullup (UART_RxD, P_2V8);
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54
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55 /* reset signal driver */
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56
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57 od_buffer reset_driver (.GND(GND), .Vcc(P_3V3), .A(ADBUS[7]), .Y(nTESTRESET));
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58 capacitor reset_driver_bypass_cap (P_3V3, GND);
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59
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60 /* pull-up resistors on control lines */
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61
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62 resistor ADBUS5_pullup (ADBUS[5], P_3V3);
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63 resistor ADBUS6_pullup (ADBUS[6], P_3V3);
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64 resistor ADBUS7_pullup (ADBUS[7], P_3V3);
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65
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66 endmodule