Multi-rate MAC to PHY interface

• US 9,379,988 B2
• Filed: 04/14/2014
• Issued: 06/28/2016
• Est. Priority Date: 01/12/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Huff, Gary S., Baumer, Howard A.
• Primary Examiner(s): Shah, Chirag
• Assistant Examiner(s): Kang, Suk Jin
• Application Number:
  US14/252,154
• Publication Number:
  US 20140219290A1
• Time in Patent Office: 806 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 13/4022 using switching circuits, e.g. switching matrix, connection or expansion network G06F13/4009 takes precedence
• CPC Class Codes: H04L 12/40169 Flexible bus arrangements arrangements for maintenance or administration involving management of faults; events, alarms H04L41/06; automatic restoration of network faults H04L41/0654
• CPC Class Codes: H04L 47/25 with rate being modified by the source upon detecting a change of network conditions

Abstract

A method and system for a multi-rate Media Access Control layer (MAC) to Physical layer (PHY) interface is provided. The method to provide a multi-rate Media Access Control layer (MAC) interface comprises receiving a first set of signals, sampling the first set of signals to determine a type of interface to be used to transmit or receive the first set of signals or a subset of the first set of signals, generating a select signal indicating type of interface to be used based on the sampling step and transmitting the first set of signals or a subset of the first set of signals using the interface indicated by the select signal. The method to provide a multi-rate Physical layer (PHY) interface comprises receiving a select signal from a Physical layer (PHY) layer indicating data rate of a first set of signals, selecting a first interface and turning off the second interface if the select signal indicates the first interface is to be used, selecting the second interface and turning off the first interface if the select signal indicates the second interface is to be used and transmitting the first set of signals using the second interface or a subset of the first set of signals using the first interface based on the select signal.

Claims

1. A method for providing a multi-rate Media Access Control (MAC) layer interface, the method comprising:

sampling a set of signals using a first MAC layer interface that corresponds to a first data rate;

generating a first signal, by the first MAC layer interface, indicating whether the set of signals corresponds to the first MAC layer interface;

sampling the set of signals using a second MAC layer interface that corresponds to a second data rate;

generating a second signal, by the second MAC layer interface, indicating whether the set of signals corresponds to the second MAC layer interface;

generating a select signal indicating a mode from a plurality of modes to be used based on the first signal and the second signal, wherein each of the plurality of modes use a shared set of communication lanes,

wherein a first mode of the plurality of modes uses at least one communication lane of the shared set of communication lanes, and

wherein a second mode of the plurality of modes uses the at least one communication lane of the first mode and one or more additional communication lanes of the shared set of communication lanes; and

transmitting the set of signals using the first MAC layer interface or a subset of the set of signals using the second MAC layer interface based on the select signal.

2. The method of claim 1, wherein the first mode corresponds to the first data rate,

wherein the second mode corresponds to the second data rate, and

wherein the second data rate is higher than the first data rate.

3. The method of claim 1, wherein the first mode and the second mode are not used simultaneously.

4. The method of claim 1, wherein the mode from the plurality of modes comprises one of:

a 10 Gigabit Attachment Unit Interface (XAUI) mode;

or

a Serial Gigabit Media Independent Interface (SGMII) mode.

5. The method of claim 4, wherein the transmitting comprises:

transmitting the set of signals using the XAUI mode; and

transmitting the subset of the set of signals using the SGMII mode.

6. The method of claim 1, further comprising:

generating a third signal that indicates a data rate of the set of signals.

7. The method of claim 1, further comprising:

generating a third signal that indicates if a 10 Gigabit Attachment Unit Interface (XAUI) has linked with the set of signals.

8. The method of claim 1, further comprising:

generating a third signal that indicates if a Serial Gigabit Media Independent Interface (SGMII) has linked with the set of signals and if a data rate of the set of signals is one of 10 Mbps, 100 Mbps or 1000 Mbps.

9. A multi-rate Physical (PHY) layer interface, comprising:

a first interface comprising a communication lane of a shared set of communication lanes and configured to receive a select signal from a PHY layer, the select signal indicating whether a first signal from a set of signals corresponds to the first interface;

a second interface comprising the communication lane of the first interface and one or more additional communication lanes of the shared set of communication lanes and configured to receive the select signal from the PHY layer, the select signal indicating whether the set of signals corresponds to the second interface; and

a mux, coupled to the first interface and to the second interface, configured to transmit the first signal from the first interface or a second signal from the second interface to a Media Access Control (MAC) layer interface based on the select signal.

10. The multi-rate PHY layer interface of claim 9, wherein the first interface corresponds to a first data rate, and

wherein the second interface corresponds to a second data rate that is higher than the first data rate.

11. The multi-rate PHY layer interface of claim 9, wherein the first interface or the second interface is turned off based on the select signal.

12. The multi-rate PHY layer interface of claim 9, wherein the first interface comprises:

a Serial Gigabit Media Independent Interface (SGMII) PHY layer interface, and wherein the second interface comprises;

a 10 Gigabit Attachment Unit Interface (XAUI) PHY layer interface.

13. The multi-rate PHY layer interface of claim 9, wherein the set of signals is transmitted using the XAUI PHY layer interface and a subset of the set of signals is transmitted using the SGMII PHY layer interface.

14. A multi-rate Media Access Control (MAC) layer interface, comprising:

a first MAC layer interface, corresponding to a first data rate and comprising a communication lane of a shared set of communication lanes, configured to generate a first signal to indicate whether a set of signals corresponds to the first data rate;

a second MAC layer interface, corresponding to a second data rate and comprising the communication lane of the first MAC layer interface and one or more additional communication lanes of the shared set of communication lanes, configured to generate a second signal to indicate whether the set of signals corresponds to the second data rate;

an auto-detect module configured to generate a third signal to indicate whether the first MAC layer interface or the second MAC layer interface is to be used based on the first signal and the second signal; and

a mux configured to transmit the set of signals from the first MAC layer interface or a subset of the set of signals from the second MAC layer interface based on the third signal.

15. The multi-rate MAC layer interface of claim 14, wherein the second data rate is higher than the first data rate.

16. The multi-rate MAC layer interface of claim 14, wherein the first MAC layer interface is configured to detect the first data rate, and

wherein the second MAC layer interface is configured to detect the second data rate.

17. The multi-rate MAC layer interface of claim 14, wherein a first mode of a plurality of modes corresponds to the first data rate,

wherein a second mode of the plurality of modes corresponds to the second data rate, and

wherein the second data rate is higher than the first data rate.

18. The multi-rate MAC layer interface of claim 17, wherein the first mode and the second mode are not used simultaneously.

19. The multi-rate MAC layer interface of claim 17, wherein the plurality of modes comprises:

a 10 Gigabit Attachment Unit Interface (XAUI) mode;

or

a Serial Gigabit Media Independent Interface (SGMII) mode.

20. The multi-rate MAC layer interface of claim 19, wherein, the first MAC layer interface is configured to transmit the set of signals using the XAUI mode, and wherein the second MAC layer interface is configured to transmit the subset of the set of signals using the SGMII mode.