Integrated circuit device and method of performing cut-through forwarding of packet data

• US 9,450,894 B2
• Filed: 06/15/2011
• Issued: 09/20/2016
• Est. Priority Date: 06/15/2011
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Edmiston, Graham
• Primary Examiner(s): Sam, Phirin
• Application Number:
  US14/125,203
• Publication Number:
  US 20140098824A1
• Time in Patent Office: 1,924 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 12/56 Packet switching systems
• CPC Class Codes: H04L 45/40 Wormhole routing
• CPC Class Codes: H04L 45/60 Router architectures
• CPC Class Codes: H04L 49/9057 Arrangements for supporting packet reassembly or resequencing

Abstract

An integrated circuit device includes a cut-through forwarding module. The cut-through forwarding module includes at least one receiver component arranged to receive data to be forwarded, and at least one transmitter component arranged to transmit data stored within at least one transmitter buffer thereof. The cut-through forwarding module further includes at least one delimiter component arranged to trigger a transmission of frame data within the at least one transmitter buffer, upon receipt of a first number elements of a respective data frame by the at least one receiver component, the first number of data elements comprising a first predefined integer value.

Claims

1. An integrated circuit device comprising:

a cut-through forwarding module comprising;

at least one receiver component arranged to receive data to be forwarded;

at least one transmitter component arranged to transmit data stored within at least one transmitter buffer thereof; and

at least one delimiter component arranged to trigger a transmission of frame data within the at least one transmitter buffer, upon receipt of a first number and a second number of data elements of a respective data frame by the at least one receiver component, the first number of data elements comprising a first predefined integer value and the second number of data elements comprising a second predefined integer value.

2. The integrated circuit device of claim 1 wherein the at least one receiver component comprises at least one receiver buffer within which received data is stored.

3. The integrated circuit device of claim 2 wherein the at least one delimiter component is arranged to transfer the second number of data elements at a start of a data frame upon receipt of said second number of data elements by the cut-through forwarding module from the at least one receiver buffer to the at least one transmitter buffer.

4. The integrated circuit device of claim 2 wherein the at least one receiver component is arranged to segment received data into blocks of a third number of data elements of data to be individually processed and subsequently transmitted.

5. The integrated circuit device of claim 1 wherein the second number of data elements is less than or equal to the first number of data elements.

6. The integrated circuit device of claim 5 wherein the at least one delimiter component is arranged to transfer the second number of data elements at a start of a data frame upon receipt of said second number of data elements by the cut-through forwarding module from the at least one receiver buffer to the at least one transmitter buffer.

7. The integrated circuit device of claim 5 wherein the at least one receiver component is arranged to segment received data into blocks of a third number of data elements of data to be individually processed and subsequently transmitted.

8. The integrated circuit device of claim 1 wherein the at least one receiver component is arranged to segment received data into blocks of a third number of data elements of data to be individually processed and subsequently transmitted.

9. The integrated circuit device of claim 8 wherein the delimiter comprises at least one from a group consisting of:

an intra-connected bus; and

a shift register;

a counter; and

at least one register.

10. The integrated circuit device of claim 1 wherein at least one from a group consisting of:

the integer value of the first number of data elements, the integer value of the second number of data elements, a third number of data elements, is/are a software configurable parameter.

11. The integrated circuit device of claim 1 wherein the delimiter comprises at least one from a group consisting of:

an intra-connected bus; and

a shift register;

a counter; and

at least one register.

12. A method of performing cut-through forwarding of packet data, the method comprising, within a cut-through forwarding module:

receiving frame data to be forwarded; and

triggering the transmission of frame data upon receipt of a first number and a second number of data elements of a respective data frame, the first number of data elements comprising a first predefined integer value and the second number of data elements comprising a second predefined integer value.

13. The method of claim 12 wherein the second number of data elements is less than or equal to the first number of data elements.

14. The method of claim 13 wherein transferring the second number of data elements comprises transferring the second number of data elements at a start of a data frame being received to a transmitter buffer, upon receipt of said second number of data elements.

15. The method of claim 13 further comprising segmenting received frame data into blocks of a third number of data elements of data to be individually processed and subsequently transmitted.

16. The method of claim 12 wherein transferring the second number of data elements comprises transferring the second number of data elements at a start of a data frame being received to a transmitter buffer, upon receipt of said second number of data elements.

17. The method of claim 16 further comprising segmenting received frame data into blocks of a third number of data elements of data to be individually processed and subsequently transmitted.

18. The method of claim 12 further comprising segmenting received frame data into blocks of a third number of data elements of data to be individually processed and subsequently transmitted.

19. The method of claim 18 further comprising segmenting received frame data into blocks of a third number of data elements of data to be individually processed and subsequently transmitted.

20. The method of claim 12 further comprising configuring via software at least one from a group consisting of:

the integer value of the first number of data elements, the integer value of the second number of data elements, a third number of data elements.