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Understanding burst mode NOR flash devices

Posted: 26 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:burst mode? NOR flash? random access? burst access?

Most Spansion LLC Flash memory devices operate with random access times on the order of 70ns to 90ns. Many applications require shorter access time to run code efficiently. To achieve shorter access times, approaches such as burst access were developed. Burst mode access can reduce the average access time of a device from 90ns to under 25ns.

The initial read access time, also referred to as asynchronous access, is where the data is accessed directly from the flash memory array. While 90ns is reasonable for non-volatile devices, it can be improved upon by buffering the memory array data and clocking the data out from the buffer. The first access in the sequence is the same as an asynchronous access, with the following accesses limited by the maximum clock frequency of the device.

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