Vmebus protocol utilizing pseudosynchronous handshaking and block mode data transfer
CA 2066440 A1 · Owner: Auspex Systems, Inc. · Inventors: Starr, Daryl D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pseudo-synchronous fast transfer handshake protocol compatible for use on a VME backplane bus (22) having a master functional module (300) and a slave functional module (200) logically interconnected by a data transfer bus. The data transfer bus (22) includes a data strobe signal line (D50 D51) and a data transfer, acknowledge signal line (DTACK). To accomplish the handshake the, master (300) transmits a data strobe signal of a given duration on the data strobe line. The master then awaits the reception of a data transfer acknowledge signal from the slave module (200) on the data transfer acknowledge signal line. The slave then responds by transmitting a data transfer acknowledge signal …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.