Rabbit 4000 16-bit Memory Wait State Bug TECHNICAL NOTE

2022-03-18
●A wait state may be missed when certain instructions transfer execution from a device operating in the advanced 16-bit mode to a device operating in a different memory interface mode. The exact circum-stances that cause the missed wait state are complicated to predict because they involve the advanced 16-bit operating mode. In this mode a semi-autonomous prefetch mechanism fetches words from a 16-bit memory to feed to the instruction decoder. The fetched instruction bytes are presented to the instruction decoder on an as-needed basis, which is only loosely coupled to the operation of the external memory bus.

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2007/7/9,

Rev. A

TN251;022-0121

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