Circuit Cellar (April 2003)

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I may eventually add another Ethernet connection to the FPGA, but for now, there are UARTs for the PS2 keyboard module, LCD, caller ID module, voice chip module interface (this is a synchronous UART method known as 16-bit SPI), RS-485 network interface, and RS-232 interface. I wrote a generic transmitter and receiver UART module that seems to be extremely robust. The receiver is clocked at eight times the data rate, thus sampling the serial input using a noise-reduction scheme. The transmitter is a fairly generic triple-buffered shift circuit.

The receiver is clocked at eight times the data rate, thus sampling the serial input using a noise-reduction scheme. The transmitter is a fairly generic triple-buffered shift circuit. Both have proven to be reliable. com. This module took a little work to get going correctly (I made several modifications so it would not use as much logic, and there was a bit-timing problem that I fixed), but it seems to work well now. Note that I got pretty lazy and only read the keyboard. The PS2 interface allows writing out to the keyboard to configure it or turn on its LEDs, but I didn’t need that.

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