SAB82C257

The SAB 82258A is an advanced general-purpose fourchannel DMA controller tailored for efficient high speed data transfer between peripheral devices and memories. SAB82C257 is either coupled tightly with a companion CPU (local mode) or
working in stand alone applications using the remote mode. The SAB 82258A is unique among DMA controllers SAB82C257 providing complete direct interfacing to the SAB 80286 as well as to SAB 80186/188/86/88 bus.

SAB82C257 four superfast DMA channels transfer rate up to 10 Mbytes per second are possible. If the maximum transfer rate
reaches as much as 20 Mbyte/second. In addition one of the DMA channels may be configured as multiplexer channel so that a large number of low speed peripherals can share the use of the same channel. The interrupt structure of SAB82C257 belongs to the fastest and most versatile ones available. Multiple SAB 82258A DMAs can be integrated very easily by using a simple local bus arbiter logic.

The SAB 82258A is the only DMA controller that provides source or destination-oriented data chaining (two chaining modes) as well as conditional command chaining (jumps within channel program based on several conditions).