Method and apparatus for transmitting data over data bus at maximum speed
US6397277B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1999 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | May 19, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/50
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for transmitting data among devices connected to a serial data bus at maximum speeds are disclosed. Each device may be capable of transmitting data at several speeds. A transmitting device first transmits a data packet to a target recipient device at a maximum transmission speed of the transmitting device. If an acknowledgement signal confirming receipt of the initial data transmission is received from the target recipient, then the transmission speed for subsequent data packet transmissions's set to the speed of the just-transmitted data. Otherwise, the transmission speed is reduced and the process is repeated. Once an acknowledgement is received and the speed is set, the speed may be stored in a memory of the transmitting device for use in future communications with the recipient device. The process is repeated to establish maximum suitable transmission speeds to other target devices connected to the bus. The invention has particular utility when used in conjunction with an IEEE 1394 serial bus interface in the absence of a bus manager. Following a bus reset operation in which the memory of each device is cleared, individual devices reestablish appropriate …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.