Method and system for high speed data retention

• US 20020172198A1
• Filed: 02/22/2001
• Published: 11/21/2002
• Est. Priority Date: 02/22/2001
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: ATI Technologies Incorporated (Advanced Micro Devices, Inc.)
• Inventors: Kovacevic, Branko D.
• Granted Patent: US 6,807,585 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream

Abstract

A system and methods are shown for accommodating high-speed data retention. Multimedia packetized stream data packets are received through a receiving hardware system. Program Specific Information and System Information data tables describing the programs and information in the packetized stream are sent as section packets within the packetized stream. Various fields are included with the section packets describing such information as the portion of the data table represented, the type of data table represented, and the version of the table represented. A host system configures the section parser to identify and pass only the section packets with the fields it specifies. The section parser then compares the fields to the configured values and determines whether to pass the packets to the host system or to discard the packets. Accordingly, processing overhead conventionally left to the host system is performed through the section parser.

Claims

1. A system for parsing section data associated with a transport packet of a packetized elementary stream, the system comprising:

a data bus having a predetermined number of nodes for transmitting a plurality of data words;

a clock node to transmit an indication when a valid data word is being transmitted on the data bus;

a section parser including;

a first storage location having an output, the first storage location to store a first value representing a valid data word having a first a first section field;

a second storage location for storing a second value representing a comparable section field; and

a first section field filter for analyzing the first value with respect to the second value.

2. The system as in claim 1, wherein the output of the first storage location in the section parser is coupled to a host system for further processing of the first value.

3. The system as in claim 1, wherein the first section field includes at least one of a table ID, a section syntax indicator, a version number, a current/next indicator, a section number, and a section payload.

4. The system as in claim 1, wherein operation of the section parser can be one of enabled and disabled.

5. The system as in claim 1, wherein the section parser includes a second section field filter coupled to the first section field filter.

6. The system as in claim 5, wherein the section parser includes control registers capable of being set to enable the first and the second filters independent of each other.

7. The system as in claim 1, wherein the section fields relate to packetized stream table data.

8. The system as in claim 7, wherein the packetized stream table data relates to Program Specific Information (PSI) Tables including at least one of one of a Program Association Table (PAT), a Program Map Table (PMT), a Network Information Table (NIT), and a Conditional Access Table (CAT).

9. The system as in claim 7, wherein the packetized stream table relates to a System Information (SI) Tables.

10. The system as in claim 1, further including:

a transport packet parser having

a storage location having an output, the storage location to store a value identifying a first valid data word, wherein the first valid data word.

a storage location having a data input coupled to at least one of the predetermined number of nodes of the data bus, a latching input, and an output, the adaptation field indicator storage location store the adaptation field indicator; and

a comparator having a first input coupled to the output of the storage location, a second input coupled to the clock node, and an output coupled to the latching input of the storage location.

11. The system as in claim 10, wherein the section parser has a modular layout, wherein the layout of the transport packet parser and the section parser are mutually exclusive.

12. The system as in claim 10, wherein the first valid data word has a first adaptation field and wherein the system further includes:

an adaptation field parser having an enable input coupled to the output of the comparator of the transport packet parser, the adaptation field parser further including

a first storage location having an output, the storage location to store a value identifying the valid data word having a first adaptation field;

a first field storage location having an input coupled to at least one node of the data bus, a latching input, and an output; and

a first comparator having a first input coupled to the output of the first storage location of the adaptation field parser, a second input coupled to the clock node, and an output coupled to the latching input of the first storage location.

14. The method as in claim 13, wherein the section packet related to table data.

15. The method as in claim 14, wherein the table data relates to Program Specific Information (PSI) tables.

16. The method as in claim 14, wherein the table data relates to System Information (SI) tables.

17. The method as in claim 13, wherein comparing the value of the first field to the value of the first field register includes determining if the values are equivalent.

18. The method as in claim 13, further including:

comparing the value of a second field in the section packet to a value of a second field register to determine a second outcome; and

determining whether to enable the section packet to be received by a host system or to discard the section packet, based upon the first and the second outcomes.

13. A method comprising:

receiving transport packets;

identifying a transport packet as being a section packet;

comparing the value of a first field in the section packet to a value of a first field register to determine a first outcome; and

determining whether to enable the section packet to be received by a host system or to discard the section packet, based upon the first outcome.