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Original question:

ADS131E08EVM-PDK: The DIN data of ADS131E08 is inconsistent with the DIN data of J1 port

TMDSEVM6678: SPI bus contention problem

Zhen He
Intellectual 360 points
Part Number: TMS320C6678
Other Parts Discussed in Thread: ADS131E08,

I am working with TMDSEVM6678 EVM and I would like to establish SPI transmission using SPI pins (CS1) on PH1 80 pins connector with ADS131E08 EVM.

However, based on the advice of engineer Cole, he believes that there is no problem with ADS, but rather that TMS320C6678 has a problem with SPI bus contention. I know that the CS1 of the TMS320C6678EVM has an FPGA and extension connector connected to it, but I took the R202 out of the Iding advice, why is there still an issue with bus contention?

Here I use SCLK, MOSI, CS to connect DSP and ADC. Then the waveforms obtained by MISO were measured respectively.

When I connected DSP and EVM with SCLK, CS, MOSI and MISO, But MISO output three types of high levels, DVDD is stable at about 1.8V, high level should be the second case. 

So, Engineer Cole's advice to me is that DSP has SPI bus contention issues.