System and method for jitter negation in a high speed serial interface
View Patent ↗A serial data channel includes a transmitter with a jitter generator that receives a jitter setting and injects a timing delay into an output signal of the transmitter in response to the jitter setting. The serial data channel further includes a receiver with an eye detector configured to evaluate a signal eye of the received output signal. The serial data channel provides a plurality of jitter settings to the jitter generator, and evaluates a plurality of signal eyes of the received output signal, where each signal eye of the plurality of signal eyes being associated with a particular received output signal generated in response to a particular one of the plurality of jitter settings. The serial data channel further selects a particular jitter setting of the plurality of jitter settings based upon the evaluation of the associated received output signal.
1. A serial data channel, comprising:
a transmitter including a jitter generator configured to receive one of a plurality of jitter settings and to inject a timing delay into an output signal of the transmitter in response to the received jitter setting; and
a receiver configured to receive the output signal from the transmitter, the receiver including an eye detector configured to evaluate a signal eye of the received output signal;
the serial data channel configured to provide the jitter settings to the jitter generator; and
the receiver configured to evaluate a plurality of signal eyes of the received output signal, each signal eye being associated with a particular received output signal generated in response to a particular one of the jitter settings, and to select a particular jitter setting based upon the evaluation of the particular received output signal.
2. The serial data channel of claim 1 , wherein the serial data channel is further configured to:
provide, from the receiver to the transmitter, information identifying the particular jitter setting; and
set the jitter generator with the particular jitter setting.
3. The serial data channel of claim 2 , wherein the serial data channel is further configured to:
train the serial data channel in response to setting the jitter generator with the particular jitter setting.
4. The serial data channel of claim 1 , wherein the particular jitter setting is selected when the particular received output signal had a greatest eye height of the plurality of signal eyes.
5. The serial data channel of claim 1 , wherein the particular jitter setting is selected when the particular received output signal had a greatest eye width of the plurality of signal eyes.
6. The serial data channel of claim 1 , wherein the particular jitter setting is selected when the particular received output signal had a greatest average of a product of an eye height and an eye width of the plurality of signal eyes.
7. The serial data channel of claim 1 , wherein the jitter generator includes a unit interval change generator configured to modify a unit interval of a state transition in the output signal of the transmitter based upon the jitter setting.
8. The serial data channel of claim 1 , wherein the jitter generator includes a phase change generator configured to modify a phase of the output signal of the transmitter based upon the jitter setting.
9. A method, comprising:
providing, to a jitter generator of a transmitter of a serial data channel, a plurality of jitter settings, wherein the jitter generator is configured to receive the jitter settings and to inject a timing delay into an output signal of the transmitter in response to the received jitter setting;
evaluating, by an eye detector of a receiver of the serial data channel, a plurality of signal eyes of a plurality of received output signals from the transmitter, each signal eye being associated with a particular received output signal generated in response to a particular one of the jitter settings; and
selecting a particular jitter setting based upon the evaluation of the particular received output signal.
10. The method of claim 9 , further comprising:
providing, from the receiver to the transmitter, information identifying the particular jitter setting; and
setting the jitter generator with the particular jitter setting.
11. The method of claim 10 , further comprising:
training the serial data channel in response to setting the jitter generator with the particular jitter setting.
12. The method of claim 9 , wherein the particular jitter setting is selected when the particular received output signal had a greatest eye height of the plurality of signal eyes.
13. The method of claim 9 , wherein the particular jitter setting is selected when the particular received output signal had a greatest eye width of the plurality of signal eyes.
14. The method of claim 9 , wherein the particular jitter setting is selected when the particular received output signal had a greatest average of a product of an eye height and an eye width of the plurality of signal eyes.
15. The method of claim 9 , further comprising:
modifying, by a unit interval change generator of the jitter generator, a unit interval of a state transition in the output signal of the transmitter based upon the jitter setting.
16. The method of claim 9 , further comprising:
modifying, by a phase change generator of the jitter generator, a phase of the output signal of the transmitter based upon the jitter setting.
17. A non-transitory computer-readable medium including code for performing a method, the method comprising:
providing, to a jitter generator of a transmitter of a serial data channel, a plurality of jitter settings, wherein the jitter generator is configured to receive the jitter settings and to inject a timing delay into an output signal of the transmitter in response to the received jitter setting;
evaluating by an eye detector of a receiver of the serial data channel, a plurality of signal eyes of a plurality of received output signals from the transmitter, each signal eye being associated with a particular received output signal generated in response to a particular one of the jitter settings; and
selecting a particular jitter setting based upon the evaluation of the particular received output signal.
18. The non-transitory computer-readable medium of claim 17 , the method further comprising:
providing, from the receiver to the transmitter, information identifying the particular jitter setting; and
setting the jitter generator with the particular jitter setting.
19. The non-transitory computer-readable medium of claim 17 , the method further comprising:
modifying, by a unit interval change generator of the jitter generator, a unit interval of a state transition in the output signal of the transmitter based upon the jitter setting.
20. The non-transitory computer-readable medium of claim 17 , the method further comprising:
modifying, by a phase change generator of the jitter generator, a phase of the output signal of the transmitter based upon the jitter setting.