Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2007-05-08
2007-05-08
Nguyen, Brian D. (Department: 2616)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S474000
Reexamination Certificate
active
09507249
ABSTRACT:
A Universal Serial Bus (USB) modem (14) in which reassembly and segmentation operations are performed outside of the host computer (12) is disclosed. A USB interface device (30) is coupled to a digital signal processor (DSP) (32) in the modem (14), and contains a shared memory (44) in which bulk endpoints (51) are established, at which received ATM cell payload data may be stored. An ATM receive controller (134) is provided in the USB interface device (30), which receives each ATM cell from the DSP (32) and interrogates the ATM cell header to determine which, if any, virtual connection the cell corresponds. The ATM receive controller (134) then forwards the payload portion of the ATM cell, but not the ATM cell header, to the endpoint (51) corresponding to the virtual connection to which the ATM cell is directed. The disclosed ATM receive controller (134) also includes logic (64) for calculating a cyclic redundancy check value over the payload portion of the ATM cells that make up an ATM packet.
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Christison Gregory Lee
Humphrey Norayda N.
Karlsson Magnus G.
Brady III Wade James
Nguyen Brian D.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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