Circuit and method of unpacking a serial bitstream

Details Circuit and method of unpacking a serial bitstream Circuit and method of unpacking a serial bitstream

1994-08-01

1997-01-14

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 65, 341100, G06F 720

Patent

active

055944370

ABSTRACT:
A bit stream unpacking circuit (10) parses data fields from a serial bitstream as an initial step in decompression. The protocol of the incoming packed data stream is stored in a control ROM (24). As each packed data field arrives, the control ROM provides size and condition instructions (18) to parse out the fields from the serial data stream and store the fields in data storage (14) for later retrieval. The size instruction determines the length of the field in the incoming data. A counter (26) counts clock signals of the incoming serial bitstream and matches the count with the size instruction to determine when a data field has arrived. The condition instruction determines the next address in the control ROM based on the incoming bitstream. Once the incoming message has been parse out and stored, the individual data field may be read directly from the data storage for decompression.

REFERENCES:
patent: 5434568 (1995-07-01), Moll
patent: 5488366 (1996-01-01), Wu

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