25 Jun '13, 1pm

USAP(USB attached SCSI Protocol)は何故従来からUSBストレージに使われて来たBOT(Bulk Only Transport)より速いのか。

USAP(USB attached SCSI Protocol)は何故従来からUSBストレージに使われて来たBOT(Bulk Only Transport)より速いのか。

Figure 3 illustrates the performance benefits of Multiple Command Queuing in mass storage devices. In BOT mode without command queuing, the device has to finish each command before it can accept a new command. It has to wait for a new command to arrive, then process it and send a completion, and wait for the completion to be acknowledged. There is considerable waiting time associated with each command. Figure 3: UASP benefits from USB 3.0’s new dual-simplex and stream-transfer features. UASP's Command Queuing capability reduces all the waiting delays by sending a new command to the device while the device may still be processing a previous command. The device, in turn, can begin processing the next command whenever it is ready to do so, without waiting for a new command to arrive, if a command has already been queued up in the device. Command queuing can also benefit USB 2...

Full article: http://electronicdesign.com/embedded/whats-difference-bet...

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