View sab8225k datasheet:

Advanced DMA Controller SAB 82C257 for 16-Bit Microcomputer Sytems (ADMA) SAB 82C258A General Description Type Package Speed Muxed The SAB 82258A is an advanced general-purpose four- Channel channel DMA controller tailored for efficient high speed data SAB 82C257-1-N P-LCC-68-1 (SMD) 10 MHz no transfer between peripheral devices and memories. It is SAB 82C258A-12-N P-LCC-68-1 (SMD) 12 MHz yes either coupled tightly with a companion CPU (local mode) or working in stand alone applications using the remote mode. SAB 82C258A-20-N P-LCC-68-1 (SMD) 20 MHz yes The SAB 82258A is unique among DMA controllers providing complete direct interfacing to the SAB 80286 as well as to Features SAB 80186/188/86/88 bus. • 16-bit DMA controller for Its four superfast DMA channels transf