Other Parts Discussed in Thread: ADS8568
Hi, my project uses SN74AVCH16T245 to connect the parallel port between ADS8568(3.3V) and C6657(1.8V). C6657 uses EMIF to drive and read ADS8568.
But the result read has some error data. So I measured the waveform of EMIF bus.
The waveform is shown below. The yellow wave is OE, green wave is EMIF_D[x] on the ADS8568 side, and the orange wave is EMIF_D[x] on the C6657 side.
You can see some "notch" in orange waveform.
I guess that's the reason but I don't know how it happens.
I also change the C6657(1.8V) to C6748(3.3V), but only get the same result as below. The yellow wave is OE, and the orange wave is EMIF_D[x] on the C6748 side.
And if leave the DSP side of the voltage transceiver floating, that is the voltage transceiver connects the ADS8568 but does not connect the DSP's EMIF_D[x] port, the wave becomes normal as well as the ADS8568 side.
So I wonder how it happens and how to solve it. Thank you!