Changing the GPIF Waveform Descriptors for the EZ-USB FX2/FX2LP (CY7C68013 /CY7C68013A) On the Fly

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    Question: What should I be aware of when changing the GPIF waveform descriptors in the middle of a GPIF transfer?



    GPIF waveform locations should not be changed while the GPIF is in the middle of a transfer. The firmware should first check that the GPIF is IDLE (using "if (GPIFTRIG & 0x80)"). A premature abort (GPIFABORT=0xFF) may also help to ensure that the GPIF is at a ground-zero state.