Method and apparatus for test pattern generation
View Patent ↗A fibre channel switch element that can generate a character or frame based test pattern is provided. The switch element includes a buffer that can be coupled to a transmission protocol engine for sending and receiving data to and from a fibre channel network, wherein the buffer is programmed to generate character or fibre channel frames for testing plural links coupled to the fibre channel switch element while operating in a character or frame mode. The buffer can be coupled to a receive or transmit path and generates characters or frames based on a programmed count to induce real-time errors. The real-time errors include a missing start of frame (“SOF”) and a missing end of frame (“EOF”).
1. A fibre channel switch element configured to generate both character- and frame-based test patterns, the switch element comprising:
a buffer configured to be coupled to a transmission protocol engine (TPE) for sending and receiving data to and from a fibre channel network and for testing at least one link coupled to the fibre channel switch element;
wherein the buffer is programmed to generate characters when operating in a character mode and to generate fibre channel frames when operating in a frame mode; and
the buffer is further configured to run in character mode and to be changed, while running in character mode, to frame mode in order to induce a protocol-specific error; and
the buffer is further configured to run in frame mode and to be changed, while running in frame mode, to character mode in order to induce a protocol-specific error.
2. The fibre channel switch element of claim 1 , wherein the buffer is configured to be coupled to a receive path or a transmit path of the TPE.
3. The fibre channel switch element of claim 1 , wherein the buffer is configured to generate characters or frames based on a programmed count.
4. The fibre channel switch element of claim 1 , wherein the buffer is configured to generate characters or frames under firmware control.
5. The fibre channel switch element of claim 1 , wherein the protocol-specific errors occur in real time.
6. The fibre channel switch element of claim 1 , wherein the protocol-specific errors include at least one of a missing start of frame (SOF) and a missing end of frame (EOF).
7. The fibre channel switch element of claim 6 , wherein to induce a missing SOF the buffer is started in a character mode and, while it is running in the character mode, it is changed to a frame mode.
8. The fibre channel switch element of claim 6 , wherein to induce a missing EOF, the buffer starts in a frame mode and, while it is running in the frame mode, it changes to a character mode.
9. A method for generating both character- and frame-based test patterns in a fibre channel switch element using a buffer configured to be coupled to at least one port, the method comprising the steps of:
programming the buffer to operate in a character mode;
connecting the at least one port to the buffer to receive data from the buffer after the buffer is programmed to operate in the character mode;
the buffer generating a character stream; and
as the buffer is generating the character stream, the buffer is changed from the character mode to a frame mode in order to induce a protocol-specific error.
10. The method of claim 9 , wherein the protocol-specific error is a missing start of frame.
11. The method of claim 9 , wherein the buffer generates characters based on a programmed count.
12. The method of claim 9 , wherein the buffer generates characters under firmware control.
13. The method of claim 9 , wherein the protocol-specific error occurs in real time.
14. A method for generating both character- and frame-based test patterns in a fibre channel switch element using a buffer configured to be coupled to at least one port, the method comprising the steps of:
programming the buffer to operate in a frame mode;
connecting the at least one port to the buffer to receive data from the buffer after the buffer is programmed to operate in the frame mode;
the buffer generating a frame; and
as the buffer is generating the frame it is changed from the frame mode to a character mode in order to induce a protocol-specific error.
15. The method of claim 14 , wherein the protocol-specific error is a missing end of frame.
16. The method of claim 14 , wherein the buffer generates the frame based on a programmed count.
17. The method of claim 14 , wherein the buffer generates the frame under firmware control.
18. The method of claim 14 , wherein the protocol-specific error occurs in real time.