Hi
I'm trying to read out the ADS7863 by the McBPS of a C28346.
Now I am confused about a timing issue that is pointed out in the manual. I am referring to the data sheet of the ADS7863 from January 2011.
I connect both CONVST and RD together, and this signal is generated by the MFSXA signal of the McBSP.
On page 8, there is a timing characteristic, telling me that CONVST has to rise 10ns before or 5ns after the rising clock of CLOCK.
But on page 15 under CONVST, the document points out:
RD (read data) and CONVST can be shorted to minimize necessary software and wiring. The RD signal is triggered by the ADS7863 on the falling edge of CLOCK. Therefore, the combined signals must be activated with the rising CLOCK edge. The conversion then starts with the subsequent rising CLOCK edge.
Now this sounds like I can toggle the CONVST/RD signal syncced to the CLOCK signal?
When I look at the timing diagram of the PSEUDO-DIFFERENTIAL MODE II on page 26 (the mode I use) it also looks like these signals are in sync, though the scale there is too small to see it clearly.
The problem is, I cannot shift the MFSXA signal of the McBSP, it always toggles the same way as the CLOCK does. At least I wouldn't know that there is a way.
Could anybody help me in this matter?
Thanks, Daniel