1 of 1 people found this helpful
Have you looked at using one of the USB to Serial cables from FTDI? This will be alot more straight forward.
Thank you for the link. May I know if I have to make any changes to use UART debug trace?
3 of 3 people found this helpful
The cable that MichaelF_56 linked will be sufficient for most things you'll be doing. It's a much faster and cheaper than building your own.
In response to your first two questions:
1. May I know if I can use just the pins 12 and 13 for TX RX connections to BCM20737S and leave pin 20 and 21 open.
Yes. 20 and 21 are only used for PUART. Unless you want your traces routed through PUART or you plan to communicate to the board over PUART in some fashion, you don't need these.
2. Can I use a switch at the TXD_ECI to BCM20737S RX interface to toggle between burning firmware mode and debug mode?
Yes. You need only a single switch on the TXD_ECI line to switch between debug and download mode. Reset with the switch connected to download, reset with it off to be able to see traces come through the UART.
Thank you for the reply. Really appreciate that