6502/8bitworkshop
1
0
Fork 0
mirror of https://github.com/sehugg/8bitworkshop.git synced 2025-02-23 18:29:02 +00:00
Code Issues Projects Releases Wiki Activity

updated cpu_platform.v to have inputs

Browse Source
This commit is contained in:
Steven Hugg 2018-07-11 19:53:05 -07:00
parent 878c61c9bf
commit f466afa085
1 changed files with 30 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
presets/verilog/cpu_platform.v
View File

@ -7,10 +7,15 @@
`include "sound_generator.v" `include "sound_generator.v"
`include "cpu16.v" `include "cpu16.v"
module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb); module cpu_platform(clk, reset, hsync, vsync,
hpaddle, vpaddle,
switches_p1, switches_p2,
rgb);
input clk, reset; input clk, reset;
input hpaddle, vpaddle; input hpaddle, vpaddle;
input [7:0] switches_p1;
input [7:0] switches_p2;
output hsync, vsync; output hsync, vsync;
output [3:0] rgb; output [3:0] rgb;
@ -30,6 +35,7 @@ module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
wire sprite_reading; wire sprite_reading;
wire [14:0] mux_ram_addr; // 15-bit RAM access wire [14:0] mux_ram_addr; // 15-bit RAM access
// multiplexor for sprite/tile/CPU RAM
always @(*) always @(*)
if (cpu_busy) begin if (cpu_busy) begin
if (sprite_reading) if (sprite_reading)
@ -49,6 +55,7 @@ module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
wire [3:0] tile_rgb; wire [3:0] tile_rgb;
wire [3:0] sprite_rgb; wire [3:0] sprite_rgb;
// video sync generator
hvsync_generator hvsync_gen( hvsync_generator hvsync_gen(
.clk(clk), .clk(clk),
.reset(reset), .reset(reset),
@ -68,6 +75,7 @@ module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
.we(ram_writeenable) .we(ram_writeenable)
); );
// tile graphics
tile_renderer tile_gen( tile_renderer tile_gen(
.clk(clk), .clk(clk),
.reset(reset), .reset(reset),
@ -81,6 +89,7 @@ module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
.rgb(tile_rgb) .rgb(tile_rgb)
); );
// sprite scanline renderer
sprite_scanline_renderer ssr( sprite_scanline_renderer ssr(
.clk(clk), .clk(clk),
.reset(reset), .reset(reset),
@ -94,11 +103,13 @@ module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
.rgb(sprite_rgb) .rgb(sprite_rgb)
); );
// tile ROM
font_cp437_8x8 tile_rom( font_cp437_8x8 tile_rom(
.addr(tile_rom_addr), .addr(tile_rom_addr),
.data(tile_rom_data) .data(tile_rom_data)
); );
// sprite ROM
example_bitmap_rom bitmap_rom( example_bitmap_rom bitmap_rom(
.addr(sprite_rom_addr), .addr(sprite_rom_addr),
.data(sprite_rom_data) .data(sprite_rom_data)
@ -116,32 +127,39 @@ module cpu_platform(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
wire busy; wire busy;
wire [15:0] cpu_bus; wire [15:0] cpu_bus;
wire [15:0] flags = {11'b0, vsync, hsync, vpaddle, hpaddle, display_on}; wire [15:0] flags = {11'b0, vsync, hsync, vpaddle, hpaddle, display_on};
wire [15:0] switches = {switches_p2, switches_p1};
assign cpu_bus = cpu_ram_addr[15] // select ROM, RAM, switches ($FFFE) or flags ($FFFF)
? (cpu_ram_addr == 16'hffff) always @(*)
? flags casez (cpu_ram_addr)
: program_rom[cpu_ram_addr[9:0]] 16'hfffe: cpu_bus = switches;
: ram_read; 16'hffff: cpu_bus = flags;
16'b0???????????????: cpu_bus = ram_read;
16'b1???????????????: cpu_bus = program_rom[cpu_ram_addr[14:0]];
endcase
// 16-bit CPU
CPU16 cpu( CPU16 cpu(
.clk(clk), .clk(clk),
.reset(reset), .reset(reset),
.hold(tile_reading | sprite_reading), .hold(tile_reading | sprite_reading), // hold input
.busy(cpu_busy), .busy(cpu_busy), // busy output
.address(cpu_ram_addr), .address(cpu_ram_addr),
.data_in(cpu_bus), .data_in(cpu_bus),
.data_out(ram_write), .data_out(ram_write),
.write(ram_writeenable)); .write(ram_writeenable));
reg [15:0] program_rom[0:1023]; // program ROM ($8000-$FFFE)
reg [15:0] program_rom[0:32767];
// example ROM program code
`ifdef EXT_INLINE_ASM `ifdef EXT_INLINE_ASM
initial begin initial begin
program_rom = '{ program_rom = '{
__asm __asm
.arch femto16 .arch femto16
.org 0x8000 .org 0x8000
.len 1024 .len 32768
mov sp,@$6fff mov sp,@$6fff
mov dx,@InitPageTable mov dx,@InitPageTable
jsr dx jsr dx
@ -182,6 +200,7 @@ ClearSLoop:
inc bx inc bx
dec cx dec cx
bnz ClearSLoop bnz ClearSLoop
rts
__endasm __endasm
}; };
end end