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=== Mode 3 ===

=== Mode 3 ===

Mode 3 requests are used for [https://en.wikipedia.org/wiki/Vectored_I/O scatter-gather] memory operations on the PCM. A Mode 3 request is made with a list of 16-bit memory addresses to be read. The PCM responds with the contents of the requested memory locations. Mode 3 scatter-gather requests are useful for retrieving specific values in memory quickly, without creating the large amount of activity on the bus as Mode 2 block reads. The table below illustrates the full structure of a Mode 3 request.

Mode 3 requests are used for [[w:Vectored I/O|scatter-gather]] memory operations on the PCM. A Mode 3 request is made with a list of 16-bit memory addresses to be read. The PCM responds with the contents of the requested memory locations. Mode 3 scatter-gather requests are useful for retrieving specific values in memory quickly, without creating the large amount of activity on the bus as Mode 2 block reads. The table below illustrates the full structure of a Mode 3 request.

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