Electronic digital logic circuitry – Interface – Current driving
Patent
1997-12-12
2000-03-21
Tokar, Michael
Electronic digital logic circuitry
Interface
Current driving
326 30, 326 98, 326 57, 326 71, H03K 190175, H03K 1716
Patent
active
06040714&
ABSTRACT:
The present invention provides a method of providing two different modes of operation for an output driver on an integrated circuit. A first mode provides an open drain driver, such as an enhanced GTL+ driver, for high-speed data transmission. A second mode provides a totem pole output driver, such as a TTL or a LVTLL driver, which does not require additional circuitry for external terminations, as is required for open drain drivers. Thus, one embodiment of the present invention can be characterized as a method of providing a dual mode output from an integrated circuit. This method includes receiving an output mode signal indicating an enhanced GTL+ output mode or a totem pole output mode. This method also includes providing an enhanced GTL+ output signal if the mode signal indicates the enhanced GTL+ output mode, and providing a totem pole output signal if the mode signal indicates the totem pole output mode. Another embodiment of the present invention can be described as a method for providing a dual mode output from an integrated circuit. This method includes providing to the integrated circuit an output mode signal indicating a first output mode or a second output mode. It also includes coupling an output pin of the integrated circuit to an open drain bus with an active termination if the mode signal indicates the first mode, and coupling an output pin of the integrated circuit to an unterminated bus if the mode signal indicates the second output mode.
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Micron Electronics Inc.
Roseen Richard
Tokar Michael
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