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Parallel bus protocol decodes bad values

Thu, 27 Jan 2022 23:49:58 GMT

Hi, I'm using SP901i with ScanaStudio 4.0.21 on macOS 10.15.7, and parallel bus decoder is 0.11. I'm trying to capture and decode a parallel bus with 8 bits of data and a strobe signal. I have a 20 seconds long capture,, but the parallel bus decodes wrong data during about 360ms, before suddendly decoding correctly. For example, where i can clearly see levels corresponding to 0x00 on the strobe's falling edge and 0x1E on its rising edge, the decoder displays instead 0xe1 and 0xff. And later the data decoding becomes suddendly right, without any obvious reason. Can you please help ? Thanks!