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Chargement…
Combinational equations produce active-low chip selects.
Behavior
0x00..0x3F selects ROM for reads only.0x40..0x7F selects RAM and 0x80..0xBF selects peripherals.bus_error is high for a ROM write or any access to 0xC0..0xFF.| Signal | Direction | Width | Description |
|---|---|---|---|
address | Input | 8 bits | Bus address |
read, write | Input | 1 bit | Transaction controls |
rom_select_n, ram_select_n, io_select_n | Output | 1 bit | Active-low selects |
bus_error | Output | 1 bit | Forbidden transaction |