Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1983-03-23
1985-06-25
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
328 55, 365221, 377 78, H04L 700
Patent
active
045258490
ABSTRACT:
In order to avoid unambiguous logic switching statuses in a data and control path upon transfer from one clock system of an outputting data processing system into an independent, asynchronous clock system of an accepting data processing system, and wherein a continuous data flow is to be guaranteed at the output of a buffer memory, a control signal indicating the presence of an intermediately stored data word is synchronized into a forwarding timing pattern of the accepting system via a synchronization circuit for forwarding data words from the buffer memory. A forwarding sync control signal is generated by the synchronization circuit. For controlling the in-flow into the buffer memory, a control signal dependent on the forwarding timing pattern of the accepting system is synchronized into the timing pattern of the outputting system over a further synchronization circuit. A request sync control signal is generated which respectively leads to the transfer of a data word together with a strobe signal to the buffer memory which undertakes the intermediate storage on the basis of the strobe signal. In order to guarantee a continuous data flow at the output of the buffer memory, the buffer memory has at least three, and preferably four memory sections.
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patent: 3893033 (1975-07-01), Finch
patent: 4070630 (1978-01-01), Hepworth et al.
patent: 4392234 (1983-07-01), Maruta
patent: 4429386 (1984-01-01), Graden
patent: 4433394 (1984-02-01), Torij et al.
patent: 4443765 (1984-04-01), Findeisen et al.
"The Incorrect Operation of Asynchronously Driven Flip-Flops", by Von Gerhard Wolf, Frequenz 31 (1977) 3, pp. 71-76.
"Asynchronous Control of Data Transfer", by Jenkins and Recupere, IBM Technical Disclosure Bulletin, vol. 10, No. 1, Jun. 1967, pp. 34-36.
Safourek Benedict V.
Siemens Aktiengesellschaft
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