Other Parts Discussed in Thread: ADC12QJ1600
Tool/software:
I am trying to program via SPI the initialization sequence for bringing up the ADCs. It looks like I have the correct values and sequence and have verified that timing is being met. However when I write and poll (like reading INIT_DONE) the behavior is not what I expect. In fact, I get what looks like erroneous responses on the SDO line even when I am in a write sequence. Any ideas why this might be?
In the attached chipscope capture,
Blue is register being written
Yellow is SDO
Purple is SDI
Green is CS
You can see SDO appearing to echo SDI, and then finally asserting. And then later (where the cursor is) during a write cycle SDO asserts again. It is not the behavior I am expecting.
BTW this is using the ADC12QJ1600 EVM with the jumper set to use the FMC interface.
