Broadcasting headers to configure physical devices interfacing a data bus with a logical assignment and to effect block data transfers between the configured logical devices
US5488694A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1992 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | Aug 28, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/423
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To effect a block data transfer between a plurality of physical I/O devices coupled through interfaces to an I/O channel ("IOC") bus, a source logical device is established by programmably assigning to each of the physical device interfaces a logical device identifier, a leaf identifier determining when the physical device participates relative to the first data transfer in the block data transfer, a burst count specifying the number of consecutive transfers for which the physical device is responsible when its interleave period arrives, and an interleave factor identifying how often the physical device participates in the block data transfer. A destination logical device is similarly established. The source and logical devices are then activated to accomplish a block transfer of data between them. To permit different I/O processors to operate independently in making I/O requests, requests from each I/O processor are communicated to an IOC controller over another bus, which need not be a high performance bus, and are serviced to construct header packets in a transaction buffer identifying IOC transactions, including source and destination logical devices. When each packet is finish…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.