Dangerous Prototypes Open Source Hardware

DAC capture in Synchronous Mode

January 19, 2013, 07:55:50 pm

I need to capture 8bit data going to a DAC in Synchronous Mode using the DAC's clock @14.33Mhz.
The DAC is using 5v logic for clock and data.

I'm adding the 4-pin header to TRGI CKI and TRGO CKO on the OLS but a little unsure if I wire the clock to TRGI or CKI and if 5v is appropriate or do I need to bring that down?

Re: DAC capture in Synchronous Mode

Reply #1 – January 20, 2013, 12:48:34 am

You want to use CKI (external clock input).  It's not buffered, so add a voltage divider to knock the 5V down to 3.3v. 

The TRGI is the external trigger input to the logic analyzer.  ie: what tells it to start capturing data.
-- IED