Electrical computers and digital data processing systems: input/ – Intrasystem connection
Reexamination Certificate
2006-05-23
2006-05-23
Perveen, Rehana (Department: 2112)
Electrical computers and digital data processing systems: input/
Intrasystem connection
C710S307000, C710S029000, C326S035000
Reexamination Certificate
active
07051127
ABSTRACT:
The present invention comprises a method and apparatus for selectively providing pre-emphasis to the output of a first driver during an initial portion of certain data transitions while transmitting data along a data bus from a source to a destination, with the certain data transitions being determined as a function of the content of the history of prior transmitted data cells. In the preferred embodiment, a pre-emphasis driver is connected in parallel to a normal driver and the pre-emphasis driver is activated preferably during the initial portion of a data transition to provide pre-emphasis in response to a control signal being applied to the pre-emphasis driver. The preferred embodiment of the present invention also comprises a sequence detector and control for monitoring the data cells or bits that are inputted to the normal driver to provide a history of the voltage levels of the data bits that are input to the normal driver. Based upon the history, the pre-emphasis driver is selectively operated to increase the slew or magnitude of the slope of a data transition at least during the initial portion of the transition.
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Dykstal John
Molgaard Jason M
Hewlett--Packard Development Company, L.P.
Huynh Kim T.
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