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I2C Bus send a strange data.

Hi there..

I created a firmware for FX2 USB 2.0 ver 2.00 by optimize, it's buffer size is 512 and doubled buffer.
I have functions to interpret buffer data to a various I2C command format (like read, write and combined format by Philips, and some delay functions) using the built-in I2C in the FX2 device.

But i got a strange data output after a first combined format, if i did not put a delay between the first and the second combined format.

The FX2 acknowledge the first data sent by the slave (some LSI device), then after the stop bit the NACK of various strange data follows.

I hope you can help me in this problem.

Thanks in advanced.