Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Patent
1999-05-21
2000-12-19
Tokar, Michael
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
328 26, 328 86, H03K 1716
Patent
active
061631655
ABSTRACT:
A method for operating an information handling system comprises includes providing at least three transmission lines each having a characteristic impedance, each of the transmission lines having a first end, each of the first ends being commonly connected to each other first end, and a second end, and providing a plurality of drivers equaling the number of transmission lines in the plurality of transmission lines, each driver coupled to a second end of a different one of the transmission lines, each driver comprising a pull-down circuit having a pull-down resistance matched to the characteristic impedance of one of the lines, and a pull-up circuit having a pull-up resistance corresponding to the number of second ends. The method further includes providing at least one receiver circuit coupled to a second end of one of the transmission lines, designating one of the drivers as an active driver, and designating each driver in the plurality of drivers other than the active driver as a terminating driver. Finally, the method includes causing each terminating driver to be configured in a nonactive pull-down terminating configuration, and causing the active driver to drive a signal onto the transmission line to which the active driver is connected.
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Le Don Phu
Sun Microsystems Inc.
Tokar Michael
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