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Decode physical addresses instead of virtual.

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address decoding is now performed on the translated address which comes
from the memory mapper, instead of the address coming directly from the
cpu.

This means that you can access the full amount of ram at any address
that it is mapped to.
This commit is contained in:
Byron Lathi
2022-04-07 12:32:51 -05:00
parent 5548f9d02a
commit 2f79a00000
3 changed files with 17 additions and 17 deletions
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8
hw/fpga/super6502.sv
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@@ -89,8 +89,8 @@ assign cpu_irqb = irq_data_out == 0;
logic [11:0] mm_MO;
logic [23:0] mm_address;
assign mm_address = {mm_MO, cpu_addr[11:0]};
logic [23:0] mm_addr;
assign mm_addr = {mm_MO, cpu_addr[11:0]};
memory_mapper memory_mapper(
.clk(clk),
@@ -106,7 +106,7 @@ memory_mapper memory_mapper(
);
addr_decode decode(
.addr(cpu_addr),
.addr(mm_addr),
.sdram_cs(sdram_cs),
.rom_cs(rom_cs),
.hex_cs(hex_cs),
@@ -140,7 +140,7 @@ sdram sdram(
.rst(rst),
.clk_50(clk_50),
.cpu_clk(cpu_phi2),
.addr(mm_address),
.addr(mm_addr),
.sdram_cs(sdram_cs),
.rwb(cpu_rwb),
.data_in(cpu_data_in),