URL
https://opencores.org/ocsvn/rtf8088/rtf8088/trunk
Show entire file |
Details |
Blame |
View Log
| Rev 2 |
Rev 7 |
| Line 1... |
Line 1... |
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
// CALL NEAR Indirect
|
// CALL NEAR Indirect
|
//
|
//
|
// 2009-2012 Robert Finch
|
// 2009-2012 Robert Finch
|
// robfinch<remove>@opencores.org
|
// robfinch<remove>@finitron.ca
|
//
|
//
|
// This source file is free software: you can redistribute it and/or modify
|
// 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
|
// 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
|
// by the Free Software Foundation, either version 3 of the License, or
|
// (at your option) any later version.
|
// (at your option) any later version.
|
| Line 18... |
Line 18... |
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
//
|
//
|
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
//
|
//
|
CALL_IN:
|
CALL_IN:
|
if (!cyc_o) begin
|
if (!cyc_o)
|
cyc_type <= `CT_WRMEM;
|
write(`CT_WRMEM,sssp,ip[15:8]);
|
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
|
else if (ack_i) begin
|
cyc_type <= `CT_PASSIVE;
|
pause_stack_push();
|
state <= CALL_IN1;
|
state <= CALL_IN1;
|
sp <= sp_dec;
|
|
stb_o <= 1'b0;
|
|
we_o <= 1'b0;
|
|
end
|
end
|
CALL_IN1:
|
CALL_IN1:
|
if (!stb_o) begin
|
if (!stb_o)
|
cyc_type <= `CT_WRMEM;
|
write(`CT_WRMEM,sssp,ip[7:0]);
|
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
|
else if (ack_i) begin
|
cyc_type <= `CT_PASSIVE;
|
nack();
|
ea <= {cs,`SEG_SHIFT}+b;
|
ea <= {cs,`SEG_SHIFT}+b;
|
if (mod==2'b11) begin
|
if (mod==2'b11) begin
|
ip <= b;
|
ip <= b;
|
state <= IFETCH;
|
state <= IFETCH;
|
end
|
end
|
else
|
else
|
state <= CALL_IN2;
|
state <= CALL_IN2;
|
cyc_o <= 1'b0;
|
|
stb_o <= 1'b0;
|
|
we_o <= 1'b0;
|
|
end
|
end
|
CALL_IN2:
|
CALL_IN2:
|
if (!cyc_o) begin
|
if (!cyc_o)
|
cyc_type <= `CT_RDMEM;
|
read(`CT_RDMEM,ea);
|
cyc_o <= 1'b1;
|
|
stb_o <= 1'b1;
|
|
we_o <= 1'b0;
|
|
adr_o <= ea;
|
|
end
|
|
else if (ack_i) begin
|
else if (ack_i) begin
|
cyc_type <= `CT_PASSIVE;
|
pause_read();
|
stb_o <= 1'b0;
|
|
state <= CALL_IN3;
|
state <= CALL_IN3;
|
b[7:0] <= dat_i;
|
b[7:0] <= dat_i;
|
end
|
end
|
CALL_IN3:
|
CALL_IN3:
|
if (!stb_o) begin
|
if (!stb_o)
|
cyc_type <= `CT_RDMEM;
|
read(`CT_RDMEM,ea_inc);
|
stb_o <= 1'b1;
|
|
adr_o <= ea_inc;
|
|
end
|
|
else if (ack_i) begin
|
else if (ack_i) begin
|
cyc_type <= `CT_PASSIVE;
|
nack();
|
state <= CALL_IN4;
|
state <= CALL_IN4;
|
cyc_o <= 1'b0;
|
|
stb_o <= 1'b0;
|
|
b[15:8] <= dat_i;
|
b[15:8] <= dat_i;
|
end
|
end
|
CALL_IN4:
|
CALL_IN4:
|
begin
|
begin
|
state <= IFETCH;
|
state <= IFETCH;
|
© copyright 1999-2024
OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.