发明名称 |
Method and apparatus for selectively providing data pre-emphasis based upon data content history |
摘要 |
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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申请公布号 |
US7051127(B2) |
申请公布日期 |
2006.05.23 |
申请号 |
US20020144278 |
申请日期 |
2002.05.10 |
申请人 |
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. |
发明人 |
MOLGAARD JASON M;DYKSTAL JOHN |
分类号 |
G06F13/00;G06F13/40 |
主分类号 |
G06F13/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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