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[/] [rtf8088/] [trunk/] [rtl/] [verilog/] [CALL_IN.v] - Blame information for rev 2

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//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// CALL NEAR Indirect
//
// 2009-2012 Robert Finch
// robfinch<remove>@opencores.org
//
// 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/>.    
//
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
//
CALL_IN:
        if (!cyc_o) begin
                cyc_type <= `CT_WRMEM;
                cyc_o <= 1'b1;
                stb_o <= 1'b1;
                we_o  <= 1'b1;
                adr_o <= sssp;
                dat_o <= ip[15:8];
        end
        else if (ack_i) begin
                cyc_type <= `CT_PASSIVE;
                state <= CALL_IN1;
                sp <= sp_dec;
                stb_o <= 1'b0;
                we_o  <= 1'b0;
        end
CALL_IN1:
        if (!stb_o) begin
                cyc_type <= `CT_WRMEM;
                cyc_o <= 1'b1;
                stb_o <= 1'b1;
                we_o  <= 1'b1;
                adr_o <= sssp;
                dat_o <= ip[7:0];
        end
        else if (ack_i) begin
                cyc_type <= `CT_PASSIVE;
                ea <= {cs,`SEG_SHIFT}+b;
                if (mod==2'b11) begin
                        ip <= b;
                        state <= IFETCH;
                end
                else
                        state <= CALL_IN2;
                cyc_o <= 1'b0;
                stb_o <= 1'b0;
                we_o  <= 1'b0;
        end
CALL_IN2:
        if (!cyc_o) begin
                cyc_type <= `CT_RDMEM;
                cyc_o <= 1'b1;
                stb_o <= 1'b1;
                we_o  <= 1'b0;
                adr_o <= ea;
        end
        else if (ack_i) begin
                cyc_type <= `CT_PASSIVE;
                stb_o <= 1'b0;
                state <= CALL_IN3;
                b[7:0] <= dat_i;
        end
CALL_IN3:
        if (!stb_o) begin
                cyc_type <= `CT_RDMEM;
                stb_o <= 1'b1;
                adr_o <= ea_inc;
        end
        else if (ack_i) begin
                cyc_type <= `CT_PASSIVE;
                state <= CALL_IN4;
                cyc_o <= 1'b0;
                stb_o <= 1'b0;
                b[15:8] <= dat_i;
        end
CALL_IN4:
        begin
                state <= IFETCH;
                ip <= b;
        end
 

Line No.	Rev	Author	Line
1	2	robfinch	`//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -`
2			`// CALL NEAR Indirect`
3			`//`
4			`// 2009-2012 Robert Finch`
5			`// robfinch<remove>@opencores.org`
6			`//`
7			`// This source file is free software: you can redistribute it and/or modify`
8			`// it under the terms of the GNU Lesser General Public License as published`
9			`// by the Free Software Foundation, either version 3 of the License, or`
10			`// (at your option) any later version.`
11			`//`
12			`// This source file is distributed in the hope that it will be useful,`
13			`// but WITHOUT ANY WARRANTY; without even the implied warranty of`
14			`// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
15			`// GNU General Public License for more details.`
16			`//`
17			`// You should have received a copy of the GNU General Public License`
18			`// along with this program. If not, see <http://www.gnu.org/licenses/>.`
19			`//`
20			`//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -`
21			`//`
22			`CALL_IN:`
23			`if (!cyc_o) begin`
24			cyc_type <= `CT_WRMEM;
25			`cyc_o <= 1'b1;`
26			`stb_o <= 1'b1;`
27			`we_o <= 1'b1;`
28			`adr_o <= sssp;`
29			`dat_o <= ip[15:8];`
30			`end`
31			`else if (ack_i) begin`
32			cyc_type <= `CT_PASSIVE;
33			`state <= CALL_IN1;`
34			`sp <= sp_dec;`
35			`stb_o <= 1'b0;`
36			`we_o <= 1'b0;`
37			`end`
38			`CALL_IN1:`
39			`if (!stb_o) begin`
40			cyc_type <= `CT_WRMEM;
41			`cyc_o <= 1'b1;`
42			`stb_o <= 1'b1;`
43			`we_o <= 1'b1;`
44			`adr_o <= sssp;`
45			`dat_o <= ip[7:0];`
46			`end`
47			`else if (ack_i) begin`
48			cyc_type <= `CT_PASSIVE;
49			ea <= {cs,`SEG_SHIFT}+b;
50			`if (mod==2'b11) begin`
51			`ip <= b;`
52			`state <= IFETCH;`
53			`end`
54			`else`
55			`state <= CALL_IN2;`
56			`cyc_o <= 1'b0;`
57			`stb_o <= 1'b0;`
58			`we_o <= 1'b0;`
59			`end`
60			`CALL_IN2:`
61			`if (!cyc_o) begin`
62			cyc_type <= `CT_RDMEM;
63			`cyc_o <= 1'b1;`
64			`stb_o <= 1'b1;`
65			`we_o <= 1'b0;`
66			`adr_o <= ea;`
67			`end`
68			`else if (ack_i) begin`
69			cyc_type <= `CT_PASSIVE;
70			`stb_o <= 1'b0;`
71			`state <= CALL_IN3;`
72			`b[7:0] <= dat_i;`
73			`end`
74			`CALL_IN3:`
75			`if (!stb_o) begin`
76			cyc_type <= `CT_RDMEM;
77			`stb_o <= 1'b1;`
78			`adr_o <= ea_inc;`
79			`end`
80			`else if (ack_i) begin`
81			cyc_type <= `CT_PASSIVE;
82			`state <= CALL_IN4;`
83			`cyc_o <= 1'b0;`
84			`stb_o <= 1'b0;`
85			`b[15:8] <= dat_i;`
86			`end`
87			`CALL_IN4:`
88			`begin`
89			`state <= IFETCH;`
90			`ip <= b;`
91			`end`
92

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[/] [rtf8088/] [trunk/] [rtl/] [verilog/] [CALL_IN.v] - Blame information for rev 2