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[/] [8051/] [trunk/] [rtl/] [verilog/] [oc8051_ports.v] - Blame information for rev 4

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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  8051 port output                                            ////
////                                                              ////
////  This file is part of the 8051 cores project                 ////
////  http://www.opencores.org/cores/8051/                        ////
////                                                              ////
////  Description                                                 ////
////   8051 special function registers: port 0:3 - output         ////
////                                                              ////
////  To Do:                                                      ////
////   nothing                                                    ////
////                                                              ////
////  Author(s):                                                  ////
////      - Simon Teran, simont@opencores.org                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// ver: 1
//
 
 
// synopsys translate_off
`include "oc8051_timescale.v"
// synopsys translate_on
 
`include "oc8051_defines.v"
 
 
module oc8051_ports (clk, rst, bit_in, data_in, wr, wr_bit, wr_addr, rd_addr, rmw, data_out, bit_out, p0_out, p1_out, p2_out, p3_out,
                     p0_in, p1_in, p2_in, p3_in);
//
// clk          (in)  clock
// rst          (in)  reset
// bit_in       (in)  bit input [oc8051_alu.desCy]
// data_in      (in)  data input (from alu destiantion 1) [oc8051_alu.des1]
// wr           (in)  write [oc8051_decoder.wr -r]
// wr_bit       (in)  write bit addresable [oc8051_decoder.bit_addr -r]
// wr_addr      (in)  write address [oc8051_ram_wr_sel.out]
// rd_addr      (in)  read address [oc8051_ram_rd_sel.out]
// rmw          (in)  read modify write feature [oc8051_decoder.rmw]
// data_out     (out) data output [oc8051_ram_sel.ports_in]
// p0_out, p1_out, p2_out, p3_out       (out) port outputs [pin]
// p0_in, p1_in, p2_in, p3_in           (in)  port inputs [pin]
//
 
 
input clk, rst, wr, wr_bit, bit_in, rmw;
input [7:0] wr_addr, rd_addr, data_in, p0_in, p1_in, p2_in, p3_in;
 
output bit_out;
output [7:0] data_out, p0_out, p1_out, p2_out, p3_out;
 
reg bit_out;
reg [7:0] data_out, p0_out, p1_out, p2_out, p3_out;
 
//
// case of writing to port
always @(posedge clk or posedge rst)
begin
  if (rst) begin
    p0_out <= #1 `OC8051_RST_P0;
    p1_out <= #1 `OC8051_RST_P1;
    p2_out <= #1 `OC8051_RST_P2;
    p3_out <= #1 `OC8051_RST_P3;
  end else
    case ({wr, wr_bit})
      2'b10: begin
        case (wr_addr)
//
// byte addresable
          `OC8051_SFR_P0: p0_out <= #1 data_in;
          `OC8051_SFR_P1: p1_out <= #1 data_in;
          `OC8051_SFR_P2: p2_out <= #1 data_in;
          `OC8051_SFR_P3: p3_out <= #1 data_in;
        endcase
      end
      2'b11: begin
        case (wr_addr[7:3])
//
// bit addressable
          `OC8051_SFR_B_P0: p0_out[wr_addr[2:0]] <= #1 bit_in;
          `OC8051_SFR_B_P1: p1_out[wr_addr[2:0]] <= #1 bit_in;
          `OC8051_SFR_B_P2: p2_out[wr_addr[2:0]] <= #1 bit_in;
          `OC8051_SFR_B_P3: p3_out[wr_addr[2:0]] <= #1 bit_in;
        endcase
      end
    endcase
end
 
always @(p0_out or p0_in or p1_out or p1_in or p2_out or p2_in or p3_out or p3_in or rmw or rd_addr)
begin
  if (rmw) begin
    case (rd_addr[5:4])
      2'b00: data_out = p0_out;
      2'b01: data_out = p1_out;
      2'b10: data_out = p2_out;
      2'b11: data_out = p3_out;
    endcase
  end else
    case (rd_addr[5:4])
      2'b00: data_out = p0_in;
      2'b01: data_out = p1_in;
      2'b10: data_out = p2_in;
      2'b11: data_out = p3_in;
    endcase
end
 
always  @(rmw or rd_addr or p0_out or p1_out or p2_out or p3_out or p0_in or p1_in or p2_in or p3_in)
begin
  if (rmw) begin
    case (rd_addr[7:3])
      `OC8051_SFR_B_P0: bit_out = p0_out[rd_addr[2:0]];
      `OC8051_SFR_B_P1: bit_out = p1_out[rd_addr[2:0]];
      `OC8051_SFR_B_P2: bit_out = p2_out[rd_addr[2:0]];
      default: bit_out = p3_out[rd_addr[2:0]];
    endcase
  end else begin
    case (rd_addr[7:3])
      `OC8051_SFR_B_P0: bit_out = p0_in[rd_addr[2:0]];
      `OC8051_SFR_B_P1: bit_out = p1_in[rd_addr[2:0]];
      `OC8051_SFR_B_P2: bit_out = p2_in[rd_addr[2:0]];
      default: bit_out = p3_in[rd_addr[2:0]];
    endcase
  end
end
 
endmodule
 

Line No.	Rev	Author	Line
1	2	simont	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// 8051 port output ////`
4			`//// ////`
5			`//// This file is part of the 8051 cores project ////`
6			`//// http://www.opencores.org/cores/8051/ ////`
7			`//// ////`
8			`//// Description ////`
9			`//// 8051 special function registers: port 0:3 - output ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// nothing ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Simon Teran, simont@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2000 Authors and OPENCORES.ORG ////`
20			`//// ////`
21			`//// This source file may be used and distributed without ////`
22			`//// restriction provided that this copyright statement is not ////`
23			`//// removed from the file and that any derivative work contains ////`
24			`//// the original copyright notice and the associated disclaimer. ////`
25			`//// ////`
26			`//// This source file is free software; you can redistribute it ////`
27			`//// and/or modify it under the terms of the GNU Lesser General ////`
28			`//// Public License as published by the Free Software Foundation; ////`
29			`//// either version 2.1 of the License, or (at your option) any ////`
30			`//// later version. ////`
31			`//// ////`
32			`//// This source is distributed in the hope that it will be ////`
33			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
34			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
35			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
36			`//// details. ////`
37			`//// ////`
38			`//// You should have received a copy of the GNU Lesser General ////`
39			`//// Public License along with this source; if not, download it ////`
40			`//// from http://www.opencores.org/lgpl.shtml ////`
41			`//// ////`
42			`//////////////////////////////////////////////////////////////////////`
43			`//`
44			`// ver: 1`
45			`//`
46
47
48			`// synopsys translate_off`
49			`include "oc8051_timescale.v"
50			`// synopsys translate_on`
51
52			`include "oc8051_defines.v"
53
54
55			`module oc8051_ports (clk, rst, bit_in, data_in, wr, wr_bit, wr_addr, rd_addr, rmw, data_out, bit_out, p0_out, p1_out, p2_out, p3_out,`
56			`p0_in, p1_in, p2_in, p3_in);`
57			`//`
58			`// clk (in) clock`
59			`// rst (in) reset`
60			`// bit_in (in) bit input [oc8051_alu.desCy]`
61			`// data_in (in) data input (from alu destiantion 1) [oc8051_alu.des1]`
62			`// wr (in) write [oc8051_decoder.wr -r]`
63			`// wr_bit (in) write bit addresable [oc8051_decoder.bit_addr -r]`
64			`// wr_addr (in) write address [oc8051_ram_wr_sel.out]`
65			`// rd_addr (in) read address [oc8051_ram_rd_sel.out]`
66			`// rmw (in) read modify write feature [oc8051_decoder.rmw]`
67			`// data_out (out) data output [oc8051_ram_sel.ports_in]`
68			`// p0_out, p1_out, p2_out, p3_out (out) port outputs [pin]`
69			`// p0_in, p1_in, p2_in, p3_in (in) port inputs [pin]`
70			`//`
71
72
73			`input clk, rst, wr, wr_bit, bit_in, rmw;`
74			`input [7:0] wr_addr, rd_addr, data_in, p0_in, p1_in, p2_in, p3_in;`
75
76			`output bit_out;`
77			`output [7:0] data_out, p0_out, p1_out, p2_out, p3_out;`
78
79			`reg bit_out;`
80			`reg [7:0] data_out, p0_out, p1_out, p2_out, p3_out;`
81
82			`//`
83			`// case of writing to port`
84			`always @(posedge clk or posedge rst)`
85			`begin`
86			`if (rst) begin`
87			p0_out <= #1 `OC8051_RST_P0;
88			p1_out <= #1 `OC8051_RST_P1;
89			p2_out <= #1 `OC8051_RST_P2;
90			p3_out <= #1 `OC8051_RST_P3;
91			`end else`
92			`case ({wr, wr_bit})`
93			`2'b10: begin`
94			`case (wr_addr)`
95			`//`
96			`// byte addresable`
97			`OC8051_SFR_P0: p0_out <= #1 data_in;
98			`OC8051_SFR_P1: p1_out <= #1 data_in;
99			`OC8051_SFR_P2: p2_out <= #1 data_in;
100			`OC8051_SFR_P3: p3_out <= #1 data_in;
101			`endcase`
102			`end`
103			`2'b11: begin`
104			`case (wr_addr[7:3])`
105			`//`
106			`// bit addressable`
107			`OC8051_SFR_B_P0: p0_out[wr_addr[2:0]] <= #1 bit_in;
108			`OC8051_SFR_B_P1: p1_out[wr_addr[2:0]] <= #1 bit_in;
109			`OC8051_SFR_B_P2: p2_out[wr_addr[2:0]] <= #1 bit_in;
110			`OC8051_SFR_B_P3: p3_out[wr_addr[2:0]] <= #1 bit_in;
111			`endcase`
112			`end`
113			`endcase`
114			`end`
115
116	4	markom	`always @(p0_out or p0_in or p1_out or p1_in or p2_out or p2_in or p3_out or p3_in or rmw or rd_addr)`
117	2	simont	`begin`
118			`if (rmw) begin`
119			`case (rd_addr[5:4])`
120			`2'b00: data_out = p0_out;`
121			`2'b01: data_out = p1_out;`
122			`2'b10: data_out = p2_out;`
123			`2'b11: data_out = p3_out;`
124			`endcase`
125			`end else`
126			`case (rd_addr[5:4])`
127			`2'b00: data_out = p0_in;`
128			`2'b01: data_out = p1_in;`
129			`2'b10: data_out = p2_in;`
130			`2'b11: data_out = p3_in;`
131			`endcase`
132			`end`
133
134			`always @(rmw or rd_addr or p0_out or p1_out or p2_out or p3_out or p0_in or p1_in or p2_in or p3_in)`
135			`begin`
136			`if (rmw) begin`
137			`case (rd_addr[7:3])`
138			`OC8051_SFR_B_P0: bit_out = p0_out[rd_addr[2:0]];
139			`OC8051_SFR_B_P1: bit_out = p1_out[rd_addr[2:0]];
140			`OC8051_SFR_B_P2: bit_out = p2_out[rd_addr[2:0]];
141			`default: bit_out = p3_out[rd_addr[2:0]];`
142			`endcase`
143			`end else begin`
144			`case (rd_addr[7:3])`
145			`OC8051_SFR_B_P0: bit_out = p0_in[rd_addr[2:0]];
146			`OC8051_SFR_B_P1: bit_out = p1_in[rd_addr[2:0]];
147			`OC8051_SFR_B_P2: bit_out = p2_in[rd_addr[2:0]];
148			`default: bit_out = p3_in[rd_addr[2:0]];`
149			`endcase`
150			`end`
151			`end`
152
153			`endmodule`
154

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[/] [8051/] [trunk/] [rtl/] [verilog/] [oc8051_ports.v] - Blame information for rev 4