a15dde0e89
Adds functions to read and write mappings, as well as enable and disable the memory mapper. This also moves increases the io space by 16 bytes.
23 lines
602 B
Systemverilog
23 lines
602 B
Systemverilog
module addr_decode(
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input logic [15:0] addr,
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output logic sdram_cs,
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output logic rom_cs,
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output logic hex_cs,
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output logic uart_cs,
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output logic irq_cs,
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output logic board_io_cs,
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output logic mm_cs1,
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output logic mm_cs2
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);
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assign rom_cs = addr >= 16'h8000;
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assign sdram_cs = addr < 16'h7fe0;
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assign mm_cs1 = addr >= 16'h7fe0 && addr < 16'h7ff0;
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assign hex_cs = addr >= 16'h7ff0 && addr < 16'h7ff4;
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assign uart_cs = addr >= 16'h7ff4 && addr < 16'h7ff6;
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assign board_io_cs = addr == 16'h7ff6;
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assign mm_cs2 = addr == 16'h7ff7;
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assign irq_cs = addr == 16'h7fff;
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endmodule
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