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Data Sensing Cut-Off Scheme

IP.com Disclosure Number: IPCOM000064687D
Original Publication Date: 1985-Aug-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Boertzel, M Ludwig, T Schettler, H Zuehlke, R [+details]

Abstract

The basic concept of the data sensing cut-off scheme consists in preventing short-circuits by comparing the data at the driver input with the signal at the output. If there are two drivers with opposite signals on a data bus, the bus is erroneous and has to be cut off immediately. For microprocessors, it is known to have bidirectional data transfer paths between the individual chips for data exchange, whereas for single-chip microprocessors it is known to have bidirectional busses directly on the chip. To prevent the high-speed bidirectional tristate driver, used in such cases, from being destroyed, short-circuit currents must be avoided. To that end, the drivers were previously designed to have a relatively high internal resistance, which led to a decline in circuit performance.