Method and apparatus for accelerating detection of serial bus device speed signals
AssigneeApple Computer, Inc.
InventorWilliam S. Duckwall
Life of this patent
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Abstract
A method and apparatus for accelerating detection of speed code signals, and in particular S400 signals, for IEEE Standard 1394-1995 serial bus devices. The present invention validates S400 mode immediately after detecting an S400 speed signal, or immediately after detecting an S400 speed signal following a first S200 speed signal. The invention further provides S200 and S100 mode validation according to current implementations. Additionally, the invention does not require RX_DATA_PREFIX as a pre-requisite for signal detection.
Claims5
A computer-readable medium containing instructions which, when executed by a computer, administer a serial bus, by
- receiving a first speed signal by a speed signal register, the first speed signal indicating a first speed code;
- receiving a second speed signal by the speed signal register, the second speed signal indicating a second speed code;
- and
- validating a speed mode based on the order in which the speed signals were received.
Dependencies are inferred from the claim text.