Data streaming for non-DMA digital computing devices

Details Data streaming for non-DMA digital computing devices Data streaming for non-DMA digital computing devices

2011-01-25

2011-01-25

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Synchronizers

C710S046000, C710S049000, C710S262000

Reexamination Certificate

active

07876870

ABSTRACT:
High-speed data streams are exchanged between two digital computing devices one or both of which lacks DMA. Data transfers are performed by the devices using High-Level Datalink Control (HDLC) frames. An initiating device indicates that it wishes to exchange data with the other device by sending an HDLC frame with data stream indentification and other information. The initial HDLC frame is sufficiently short that at least an essential portion of the frame can be stored in a receive buffer of the interface circuitry. Although the receiving device may not receive the entire HDLC frame correctly because of the possibility of an overrun condition, enough information is preserved in the interface circuitry to complete the transaction. The responding device then proceeds to read or write data at high speed using a series of exchanges with the initiating device.

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