Texas Instruments Corporation

Anthony S Rowell

Amarjit Singh Bhandal

Sean N Batty

Robert J Harrison

Christopher J Hall

The present invention is a method of reducing latency in transmitting frames of data in a shared access media environment whereby the preamble of the next frame to be transmitted is transmitted while the data portion of the next frame to be transmitted is being retrieved. In another aspect, the early transmission of the preamble of the next frame is started no later than the time it normally takes to fetch and prepare the next frame for transmission less the time it takes to transmit the preamble.

Early preamble transmission

The present invention provides for a statistics Cyclic Redundancy Check (CRC) ) wherein the statistics CRC ( ) is representative of the values contained within a statistics RAM ( ). The statistics CRC ( ) is then used to reduce test vectors by allowing the validity of the statistics to be determined by reading this signature instead of reading all the individual statistics. The signature is regenerated for each complete pass of the statistics, and the contents of this register are only updated when the pass is complete.

Statistics signature generation and analysis

A circuit ( ) generates one or more signals to be delayed by a corresponding time intervals. Tapped delay lines ( ) are coupled to the signals, each tapped delay line including a plurality of delay elements ( ) and having a plurality of exit points (E) through which said signal may propagate. A test circuit ( ) determines a delay associated with a delay element in the circuit and selects one of said exit points of each of said tapped delay lines based on said delay.

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Irchester, United Kingdom

Anthony S Rowell