Optimized active SCSI termination technique

Details Optimized active SCSI termination technique Optimized active SCSI termination technique

1994-06-27

1996-04-23

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

326 86, 326 90, H03K 1716, H03K 301

Patent

active

055107273

ABSTRACT:
The invention employs an active element, a p-channel MOSFET, between a regulated voltage and a SCSI terminating line. An "ideal" current source terminator is most effective when a signal line is negated (low-to-high transition), whereas a resistive terminator is most effective when a signal line is asserted (high-to-low transition). The I-V characteristics of a p-channel MOSFET, wherein the relationship between the termination voltage and the termination current is characterized by a nonlinear and smooth voltage versus current curve, provide an optimized transient response for signal negations and signal assertions on a SCSI bus.

REFERENCES:
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patent: 5338979 (1994-08-01), Mammano et al.
IBM Technical Disclosure Bulletin, "3-Mode Small Computer System Interface Terminator", vol. 37, No. 11, Nov. 1994.
Texas Instruments Inc., "TL2218-285 Excalibur SCSI Terminator," Advance Information Document, Draft #3, Jun. 16, 1992.
Ram Gopalan, Mark Vitunic, "An Optimized Active SCSI Termination Technique," Silicon Valley Personal Computer Design Conference, Jul. 20-22, 1993, vol. II, pp. 339-344.

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