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[/] [rtf8088/] [trunk/] [rtl/] [verilog/] [CMPSB.v] - Blame information for rev 7

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//=============================================================================
//  CMPSB
//
//
//  2009-2013 Robert Finch
//  Stratford
//  robfinch<remove>@finitron.ca
//
//
// 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 3 of the License, or     
// (at your option) any later version.                                      
//                                                                          
// This source file 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 General Public License for more details.                             
//                                                                          
// You should have received a copy of the GNU General Public License        
// along with this program.  If not, see <http://www.gnu.org/licenses/>.    
//
//
//=============================================================================
//
CMPSB:
        begin
                read(`CT_RDMEM,{seg_reg,`SEG_SHIFT} + si);
                lock_o <= 1'b0;
                state <= CMPSB1;
        end
CMPSB1:
        if (ack_i) begin
                nack();
                state <= CMPSB2;
                lock_o <= 1'b0;
                a[ 7:0] <= dat_i[7:0];
                a[15:8] <= {8{dat_i[7]}};
        end
CMPSB2:
        begin
                state <= CMPSB3;
                read(`CT_RDMEM,esdi);
                lock_o <= 1'b0;
        end
CMPSB3:
        if (ack_i) begin
                nack();
                state <= CMPSB4;
                lock_o <= 1'b0;
                b[ 7:0] <= dat_i[7:0];
                b[15:8] <= {8{dat_i[7]}};
        end
CMPSB4:
        begin
                pf <= pres;
                zf <= reszb;
                sf <= resnb;
                af <= carry   (1'b1,a[3],b[3],alu_o[3]);
                cf <= carry   (1'b1,a[7],b[7],alu_o[7]);
                vf <= overflow(1'b1,a[7],b[7],alu_o[7]);
                if (df) begin
                        si <= si_dec;
                        di <= di_dec;
                end
                else begin
                        si <= si_inc;
                        di <= di_inc;
                end
                if ((repz & !cxz & zf) | (repnz & !cxz & !zf)) begin
                        cx <= cx_dec;
                        ip <= ir_ip;
                        state <= IFETCH;
                end
                else
                        state <= IFETCH;
        end
 

Line No.	Rev	Author	Line
1	2	robfinch	`//=============================================================================`
2			`// CMPSB`
3			`//`
4			`//`
5	7	robfinch	`// 2009-2013 Robert Finch`
6	2	robfinch	`// Stratford`
7	7	robfinch	`// robfinch<remove>@finitron.ca`
8	2	robfinch	`//`
9			`//`
10			`// This source file is free software: you can redistribute it and/or modify`
11			`// it under the terms of the GNU Lesser General Public License as published`
12			`// by the Free Software Foundation, either version 3 of the License, or`
13			`// (at your option) any later version.`
14			`//`
15			`// This source file is distributed in the hope that it will be useful,`
16			`// but WITHOUT ANY WARRANTY; without even the implied warranty of`
17			`// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
18			`// GNU General Public License for more details.`
19			`//`
20			`// You should have received a copy of the GNU General Public License`
21			`// along with this program. If not, see <http://www.gnu.org/licenses/>.`
22			`//`
23			`//`
24			`//=============================================================================`
25			`//`
26			`CMPSB:`
27	7	robfinch	`begin`
28			read(`CT_RDMEM,{seg_reg,`SEG_SHIFT} + si);
29	2	robfinch	`lock_o <= 1'b0;`
30			`state <= CMPSB1;`
31			`end`
32			`CMPSB1:`
33			`if (ack_i) begin`
34	7	robfinch	`nack();`
35	2	robfinch	`state <= CMPSB2;`
36			`lock_o <= 1'b0;`
37			`a[ 7:0] <= dat_i[7:0];`
38			`a[15:8] <= {8{dat_i[7]}};`
39			`end`
40			`CMPSB2:`
41			`begin`
42			`state <= CMPSB3;`
43	7	robfinch	read(`CT_RDMEM,esdi);
44	2	robfinch	`lock_o <= 1'b0;`
45			`end`
46			`CMPSB3:`
47			`if (ack_i) begin`
48	7	robfinch	`nack();`
49	2	robfinch	`state <= CMPSB4;`
50			`lock_o <= 1'b0;`
51			`b[ 7:0] <= dat_i[7:0];`
52			`b[15:8] <= {8{dat_i[7]}};`
53			`end`
54			`CMPSB4:`
55			`begin`
56			`pf <= pres;`
57			`zf <= reszb;`
58			`sf <= resnb;`
59			`af <= carry (1'b1,a[3],b[3],alu_o[3]);`
60			`cf <= carry (1'b1,a[7],b[7],alu_o[7]);`
61			`vf <= overflow(1'b1,a[7],b[7],alu_o[7]);`
62			`if (df) begin`
63			`si <= si_dec;`
64			`di <= di_dec;`
65			`end`
66			`else begin`
67			`si <= si_inc;`
68			`di <= di_inc;`
69			`end`
70			`if ((repz & !cxz & zf) \| (repnz & !cxz & !zf)) begin`
71			`cx <= cx_dec;`
72	7	robfinch	`ip <= ir_ip;`
73			`state <= IFETCH;`
74	2	robfinch	`end`
75			`else`
76			`state <= IFETCH;`
77			`end`
78

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[/] [rtf8088/] [trunk/] [rtl/] [verilog/] [CMPSB.v] - Blame information for rev 7