OpenCores
URL https://opencores.org/ocsvn/klc32/klc32/trunk

Subversion Repositories klc32

[/] [klc32/] [trunk/] [rtl/] [verilog/] [TRAP.v] - Blame information for rev 12

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 2 robfinch
// ============================================================================
2
// (C) 2011 Robert Finch
3
// All Rights Reserved.
4
// robfinch<remove>@opencores.org
5
//
6
// KLC32 - 32 bit CPU
7
// TRAP.v
8
//
9
// This source file is free software: you can redistribute it and/or modify 
10
// it under the terms of the GNU Lesser General Public License as published 
11
// by the Free Software Foundation, either version 3 of the License, or     
12
// (at your option) any later version.                                      
13
//                                                                          
14
// This source file is distributed in the hope that it will be useful,      
15
// but WITHOUT ANY WARRANTY; without even the implied warranty of           
16
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            
17
// GNU General Public License for more details.                             
18
//                                                                          
19
// You should have received a copy of the GNU General Public License        
20
// along with this program.  If not, see <http://www.gnu.org/licenses/>.    
21
//                                                                          
22
// ============================================================================
23
//
24
TRAP1:
25
        if (!cyc_o) begin
26
                fc_o <= {3'b101};
27
                cyc_o <= 1'b1;
28
                stb_o <= 1'b1;
29
                we_o <= 1'b1;
30
                sel_o <= 4'b1111;
31
                adr_o <= ssp - 32'd4;
32
                dat_o <= pc;
33
        end
34
        else if (ack_i) begin
35
                stb_o <= 1'b0;
36
                we_o <= 1'b0;
37
                sel_o <= 4'b0000;
38
                sr1 <= sr;
39
                sf <= 1'b1;
40
                tf <= 1'b0;
41
                ssp <= ssp - 32'd4;
42
                state <= TRAP2;
43
        end
44
TRAP2:
45
        if (!stb_o) begin
46
                fc_o <= {3'b101};
47
                stb_o <= 1'b1;
48
                we_o <= 1'b1;
49
                sel_o <= 4'b1111;
50
                adr_o <= ssp - 32'd4;
51
                dat_o <= cr;
52
        end
53
        else if (ack_i) begin
54
                stb_o <= 1'b0;
55
                we_o <= 1'b0;
56
                sel_o <= 4'b0000;
57
                ssp <= ssp - 32'd4;
58
                state <= TRAP3;
59
        end
60
TRAP3:
61
        if (!stb_o) begin
62
                fc_o <= {3'b101};
63
                stb_o <= 1'b1;
64
                we_o <= 1'b1;
65
                sel_o <= 4'b1111;
66
                adr_o <= ssp - 32'd4;
67
                dat_o <= sr1;
68
        end
69
        else if (ack_i) begin
70
                cyc_o <= 1'b0;
71
                stb_o <= 1'b0;
72
                we_o <= 1'b0;
73
                sel_o <= 4'b0000;
74
                ssp <= ssp - 32'd4;
75
                state <= VECTOR;
76
        end
77
 

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.