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Altera_Forum's avatar
Altera_Forum
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18 years ago

uart communications

Hey, I'm doing a project involving the DE2 FPGA, where I need to communicate with a pc via a serial interface. I have checked the pin assignments file and noticed there are only 2 pins associated wit...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

I'd suggest removing the inverter from your TxD signal again. Unless there's another external inversion going on, normally I'd expect the TTL/CMOS level signal to idle high and the RS232 level signal to idle negative. From what you said in an earlier post, this would also mean that the transmit LED would be off when idle, which makes sense.