UART (8250, RS-232規格を満たしていればよい) 説明 https://en.wikibooks.org/wiki/Serial_Programming/8250_UART_Programming 実装例 https://github.com/varmil/uart-verilog https://www.nandland.com/vhdl/modules/module-uart-serial-port-rs232.html …

CPU受付完了時にassertするIACKピンの実装 We also want to have to ability to service external interrupts. This is useful if a device external to the processor needs attention. To do this, we'll add 2 pins to the processor. The first pin, cal…