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comparison duart28c/src/vsrc/application_block.v @ 46:d80978bd645e

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duart28c: started with a copy from duart28
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 29 Jul 2020 07:08:28 +0000
parents
children 5bdd24aae51e
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45:2f8a4e3c48cb 46:d80978bd645e
1 /*
2 * This module encapsulates the application function of our board:
3 * dual UART with 2.8V outputs.
4 */
5
6 module application_block (GND, P_3V3, P_2V8, ADBUS, BDBUS);
7
8 input GND, P_3V3, P_2V8;
9
10 inout [7:0] ADBUS, BDBUS;
11
12 /* 2.8V output wires */
13
14 wire TxD_2V8_before_R, RTS_2V8_before_R, DTR_2V8_before_R, TxD2_2V8_before_R;
15 wire TxD_2V8_after_R, RTS_2V8_after_R, DTR_2V8_after_R, TxD2_2V8_after_R;
16
17 /* input signal wires */
18
19 wire RxD_in, CTS_in, DSR_in, DCD_in, RI_in, RxD2_in;
20
21 /* output buffers */
22
23 buffer_ic_common output_buf_common (.Vcc(P_2V8),
24 .GND(GND),
25 .nOE1(GND),
26 .nOE2(GND)
27 );
28
29 capacitor output_buf_bypass_cap (P_2V8, GND);
30
31 buffer_ic_slot buf_TxD (.A(ADBUS[0]), .Y(TxD_2V8_before_R));
32 buffer_ic_slot buf_RTS (.A(ADBUS[2]), .Y(RTS_2V8_before_R));
33 buffer_ic_slot buf_DTR (.A(ADBUS[4]), .Y(DTR_2V8_before_R));
34 buffer_ic_slot buf_TxD2 (.A(BDBUS[0]), .Y(TxD2_2V8_before_R));
35
36 buffer_ic_slot unused_output_buf1 (.A(GND), .Y());
37 buffer_ic_slot unused_output_buf2 (.A(GND), .Y());
38 buffer_ic_slot unused_output_buf3 (.A(GND), .Y());
39 buffer_ic_slot unused_output_buf4 (.A(GND), .Y());
40
41 /* output series resistors */
42
43 resistor TxD_series_R (TxD_2V8_before_R, TxD_2V8_after_R);
44 resistor RTS_series_R (RTS_2V8_before_R, RTS_2V8_after_R);
45 resistor DTR_series_R (DTR_2V8_before_R, DTR_2V8_after_R);
46 resistor TxD2_series_R (TxD2_2V8_before_R, TxD2_2V8_after_R);
47
48 /* input buffers */
49
50 buffer_ic_common input_buf_common (.Vcc(P_3V3),
51 .GND(GND),
52 .nOE1(GND),
53 .nOE2(GND)
54 );
55
56 capacitor input_buf_bypass_cap (P_3V3, GND);
57
58 buffer_ic_slot buf_RxD (.A(RxD_in), .Y(ADBUS[1]));
59 buffer_ic_slot buf_CTS (.A(CTS_in), .Y(ADBUS[3]));
60 buffer_ic_slot buf_DSR (.A(DSR_in), .Y(ADBUS[5]));
61 buffer_ic_slot buf_DCD (.A(DCD_in), .Y(ADBUS[6]));
62 buffer_ic_slot buf_RI (.A(RI_in), .Y(ADBUS[7]));
63 buffer_ic_slot buf_RxD2 (.A(RxD2_in), .Y(BDBUS[1]));
64
65 buffer_ic_slot unused_input_buf1 (.A(GND), .Y());
66 buffer_ic_slot unused_input_buf2 (.A(GND), .Y());
67
68 /* input pull-up resistors */
69
70 resistor RxD_pullup (RxD_in, P_2V8);
71 resistor CTS_pullup (CTS_in, P_2V8);
72 resistor DSR_pullup (DSR_in, P_2V8);
73 resistor DCD_pullup (DCD_in, P_2V8);
74 resistor RI_pullup (RI_in, P_2V8);
75 resistor RxD2_pullup (RxD2_in, P_2V8);
76
77 /* target interface headers */
78
79 target_if target_if ( .GND(GND),
80 .UART0_TxD(TxD_2V8_after_R),
81 .UART0_RxD(RxD_in),
82 .UART0_RTS(RTS_2V8_after_R),
83 .UART0_CTS(CTS_in),
84 .UART0_DTR(DTR_2V8_after_R),
85 .UART0_DSR(DSR_in),
86 .UART0_DCD(DCD_in),
87 .UART0_RI(RI_in),
88 .UART1_TxD(TxD2_2V8_after_R),
89 .UART1_RxD(RxD2_in)
90 );
91
92 endmodule