Data streaming for non-DMA digital computing devices
US6574294B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1996 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Aug 21, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/437
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.