Apple-1-HW
/
Apple1_MiST
mirror of https://github.com/nippur72/Apple1_MiST.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

rename addr, cpu_din, cpu_dout

This commit is contained in:
nino-porcino 2021-12-30 19:11:11 +01:00
parent df84408d1f
commit 8f878fb822
1 changed files with 24 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
rtl/apple1.v
View File

@ -46,9 +46,9 @@ module apple1(
//////////////////////////////////////////////////////////////////////////
// Registers and Wires
wire [15:0] ab;
wire [7:0] dbi;
wire [7:0] dbo;
wire [15:0] addr;
wire [7:0] cpu_din;
wire [7:0] cpu_dout;
wire we;
//////////////////////////////////////////////////////////////////////////
@ -79,9 +79,9 @@ module apple1(
.clk (clk14),
.enable (cpu_clken),
.rst (rst),
.ab (ab),
.dbi (dbi),
.dbo (dbo),
.ab (addr),
.dbi (cpu_din),
.dbo (cpu_dout),
.we (we),
.irq_n (1'b1),
.nmi_n (1'b1),
@ -91,11 +91,11 @@ module apple1(
//////////////////////////////////////////////////////////////////////////
// Address Decoding
wire ram_cs = (ab[15:13] == 3'b000); // 0x0000 -> 0x1FFF
wire keyboard_cs = (ab[15:1] == 15'b110100000001000); // 0xD010 -> 0xD011
wire display_cs = (ab[15:1] == 15'b110100000001001); // 0xD012 -> 0xD013
wire basic_cs = (ab[15:12] == 4'b1110); // 0xE000 -> 0xEFFF
wire rom_cs = (ab[15:8] == 8'b11111111); // 0xFF00 -> 0xFFFF
wire ram_cs = (addr[15:13] == 3'b000); // 0x0000 -> 0x1FFF
wire keyboard_cs = (addr[15:1] == 15'b110100000001000); // 0xD010 -> 0xD011
wire display_cs = (addr[15:1] == 15'b110100000001001); // 0xD012 -> 0xD013
wire basic_cs = (addr[15:12] == 4'b1110); // 0xE000 -> 0xEFFF
wire rom_cs = (addr[15:8] == 8'b11111111); // 0xFF00 -> 0xFFFF
wire [7:0] display_dout = 8'b0; // display always returns ready on the control port
@ -106,9 +106,9 @@ module apple1(
wire [7:0] ram_dout;
ram ram(
.clk(clk14),
.address(ab[12:0]),
.address(addr[12:0]),
.w_en(we & ram_cs),
.din(dbo),
.din(cpu_dout),
.dout(ram_dout)
);
@ -116,7 +116,7 @@ module apple1(
wire [7:0] rom_dout;
rom_wozmon rom_wozmon(
.clk(clk14),
.address(ab[7:0]),
.address(addr[7:0]),
.dout(rom_dout)
);
@ -124,7 +124,7 @@ module apple1(
wire [7:0] basic_dout;
rom_basic rom_basic(
.clk(clk14),
.address(ab[11:0]),
.address(addr[11:0]),
.dout(basic_dout)
);
@ -139,7 +139,7 @@ module apple1(
.key_clk(ps2_clk),
.key_din(ps2_din),
.cs(keyboard_cs),
.address(ab[0]),
.address(addr[0]),
.dout(ps2_dout)
);
@ -154,9 +154,9 @@ module apple1(
.vga_grn(vga_grn),
.vga_blu(vga_blu),
.address(ab[0]),
.address(addr[0]),
.w_en(we & display_cs),
.din(dbo),
.din(cpu_dout),
.mode(2'b0),
.fg_colour(3'd7),
.bg_colour(3'd0),
@ -167,10 +167,10 @@ module apple1(
// CPU Data In MUX
// link up chip selected device to cpu input
assign dbi = ram_cs ? ram_dout :
rom_cs ? rom_dout :
basic_cs ? basic_dout :
display_cs ? display_dout :
keyboard_cs ? ps2_dout :
8'hFF;
assign cpu_din = ram_cs ? ram_dout :
rom_cs ? rom_dout :
basic_cs ? basic_dout :
display_cs ? display_dout :
keyboard_cs ? ps2_dout :
8'hFF;
endmodule