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Altera_Forum
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17 years ago

RS232 communication with a MAX 2 CPLD

Hi everyone, I'm trying to send data (8 bits) from my CPLD MAX2 to my computer using the RS232 protocol but I don't find anything good. First, I have tried the SOPC RS2323 module witch give ...
Altera_Forum's avatar
Altera_Forum
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17 years ago

A basic Rx- or Tx-UART with MAX II is pretty easy. I append a component I previously used. Please note the unusual oversampling ratio of 13 with the receiver, that helps to setup the needed baud rate with a rather low crystal frequency.

But I don't think that it will work satisfyingly with MAX II internal oscillator, cause the frequency is too unprecise. A least a tuning for each individual device would be necessary.