Backplane interface adapter

• US 7,978,702 B2
• Filed: 02/17/2009
• Issued: 07/12/2011
• Est. Priority Date: 11/17/2000
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Foundry Networks LLC (Broadcom, Inc.)
• Inventors: Patel, Ronak, Chang, Andrew, Wong, Ming G.
• Primary Examiner(s): Abelson; Ronald
• Application Number:
  US12/372,390
• Publication Number:
  US 20090279561A1
• Time in Patent Office: 875 Days
• Field of Search: 370412-418, 370/392, 370/429, 370/907, 370/395.3, 370/389, 370/244, 370/395.1, 370/401, 370/419, 370/471, 370476-477, 370/230, 370/235, 370/357, 370/360, 370/363, 370/366, 370/362, 370/472
• US Class Current: 370/392
• CPC Class Codes: H04L 47/50 Queue scheduling
• CPC Class Codes: H04L 47/6225 Fixed service order, e.g. Round Robin
• CPC Class Codes: H04L 49/153 ATM switching fabrics having parallel switch planes
• CPC Class Codes: H04L 49/1538 Cell slicing
• CPC Class Codes: H04L 49/25 Routing or path finding in a switch fabric
• CPC Class Codes: H04L 49/30 Peripheral units, e.g. input or output ports
• CPC Class Codes: H04L 49/3063 Pipelined operation
• CPC Class Codes: H04L 49/352 Gigabit ethernet switching [GBPS]
• CPC Class Codes: H04L 49/90 Buffering arrangements
• CPC Class Codes: H04L 49/901 using storage descriptor, e.g. read or write pointers
• CPC Class Codes: Y10S 370/907 Synchronous optical network, SONET

Abstract

A backplane interface adapter for a network switch. The backplane interface adapter includes at least one receiver that receives input cells carrying packets of data; at least one cell generator that generates encoded cells which include the packets of data from the input cells; and at least one transmitter that transmits the generated cells to a switching fabric. The cell includes a destination slot identifier that identifies a slot of the switching fabric towards which the respective input cell is being sent. The generated cells include in-band control information.

Claims

1. A backplane interface adapter comprising:

at least one receiver that receives input cells, each input cell comprising at least part of a packet of data;

at least one cell generator that generates encoded cells for transmission over a switch fabric, each encoded cell comprising at least part of the packet of data from at least one input cell; and

at least one transmitter that transmits the generated encoded cells to a switching fabric; and

wherein each input cell includes a destination slot identifier that identifies a slot; and

wherein each encoded cell comprises the destination slot identifier towards which the encoded cell is to be sent via the switching fabric.

2. The backplane interface adapter of claim 1,

wherein each cell generator distributes portions of the packet of data across one or more blocks in a first cell until an end of packet condition is reached or a maximum cell size is reached.

3. The backplane interface adapter of claim 2, wherein each cell generator further encodes an end cell with end of packet information that varies depending upon a set of end of packet conditions including whether the end of packet occurs at the end of an initial block, at the end of the initial block, within a subsequent block, at a block boundary, or at a cell boundary.

4. A backplane interface adapter for interfacing with a switching fabric of a network switch, the network switch for switching packets in a network, the backplane interface adapter comprising:

a first receiver that serially receives cells from the switching fabric via a full duplex serial link;

a first transmitter that serially transmits cells to the switching fabric via a full duplex serial link;

wherein each said full duplex serial link is capable of handling full duplex traffic of at least 2.5 gigabits/second,

wherein at least some of the cells comprise in-band state information and at least one byte of said packet;

wherein each cell received from the switching fabric includes a destination slot identifier that identifies a slot;

wherein each cell transmitted to the switching fabric comprises the destination slot identifier towards which the encoded cell is to be sent via the switching fabric.

5. The backplane interface adapter of claim 4, wherein said in-band state information of said cell received from the switching fabric comprises a source slot identifier.

6. The backplane interface adapter of claim 5, wherein the in-band state information of the cell received from the switching fabric comprises payload state information that indicates a particular state of data in the cell.

7. The backplane interface adapter of claim 5, wherein the in-band state information comprises information that indicates a start of a packet.

8. The backplane interface adapter of claim 5, wherein the in-band state information comprises information that indicates an end of a packet.

9. The backplane interface adapter of claim 4, wherein the in-band state information of the cell received from the switching fabric comprises payload state information that indicates a particular state of data in the cell.

10. The backplane interface adapter of claim 4, wherein the in-band state information of the cell transmitted to the switching fabric comprises payload state information that indicates a particular state of data in the cell.

11. The backplane interface adapter of claim 4, wherein the in-band state information comprises information that indicates a start of a packet.

12. The backplane interface adapter of claim 4, wherein the in-band state information comprises information that indicates an end of a packet.