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Altera_Forum's avatar
Altera_Forum
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10 years ago

clock select for internal FPGA logic

HI I am working on Arria v FPGA and I am writing the code for transferring serial data to a remote module using RS-422 protocol. Here I need to dynamically change the clock rate depending on some...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

You question wasn't clear on what you need to change. If you need to change the RS422 baud rate but leave the rest of the logic running normlly use a UART with a programmable baud rate. QSYS comes with "Altera 16550 Compatible UART". It has multiplier and divisor registers for the clock rate. If you choose the clock wisely, you can probably set the desired rates.

I don't think you can use a multiplexer, or any other logic on clock signals. I've been told that anyway.