Direct transaction mode for peripheral devices

Details Direct transaction mode for peripheral devices Direct transaction mode for peripheral devices

2005-05-03

2005-05-03

Fleming, Fritz (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output command process

C710S015000, C710S052000

Reexamination Certificate

active

06889262

ABSTRACT:
A method and system for more directly reading from or writing to a peripheral device coupled to a computer via a standard communication protocol (such as Universal Serial Bus (USB)) by bypassing portions of the standard communication technology. The host controller monitors the status of a direct command queue after the completion of each standard communication transaction. If a command is present in the direct command queue, the command is carried out before any standard communication transactions are performed. If no command is present in the direct command queue, a standard communication transaction is carried out. The relatively long latency encountered when accessing critical command status registers via standard communication technology is thus avoided.

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