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The Essential Guide to Serial ATA and SATA Express
book

The Essential Guide to Serial ATA and SATA Express

by David A. Deming
October 2014
Intermediate to advanced content levelIntermediate to advanced
496 pages
15h 38m
English
Auerbach Publications
Content preview from The Essential Guide to Serial ATA and SATA Express
Port Multipliers and Selectors 409
The Port Multiplier’s operation is the same, regardless of the switching type used by the host.
9.11.1 Command-Based Switching
Host controllers that do not support hardware context switching utilize a switching type called
command-based switching.
To use command-based switching, the host controller has commands outstanding to only one
device at any point in time.
By only issuing commands to one device at a time, the result is that the Port Multiplier only
delivers FISes from that device.
A host controller may support command-based switching by implementing the Port Multiplier Port
(PMP) field in the SControl register.
In order to use this mechanism, host software will set the PMP field appropriately ...
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Publisher Resources

ISBN: 9781482243314