IS82C237

CMOS高性能可编程DMA控制器 CMOS High Performance Programmable DMA Controller

Description

The 82C237 is a modified version of the 82C37A. The 82C237 is fully software and pin for pin compatible with the 82C37A but provides an additional mode for 16-bit DMA transfers, as well as enhanced speed. Each channel may be individually programmed for 8-bit or 16-bit data transfers.

Features

• Fully Compatible with 82C37A

\- 82C237 May be Used in 8MHz and 12.5MHz 82C37A Sockets

• Optimized for 10MHz and 12.5MHz 80C286 Systems

• Special Mode Permits 16-Bit, Zero Wait State DMA Transfers

• High Speed Data Transfers:

\- Up to 6.25MBytes/sec with 12.5MHz Clock in Normal Mode

\- Up to 12.5MBytes/sec with 12.5MHz Clock in 16-Bit Mode

• Compatible with the NMOS 8237A

• Four Independent Maskable Channels with Autoinitialization Capability

• Cascadable to any Number of Channels

• Memory-to-Memory Transfers

• Static CMOS Design Permits Low Power Operation

\- ICCSB = 10µA Maximum

\- ICCOP = 2mA/MHz Maximum

• Fully TTL/CMOS Compatible

• Internal Registers may be Read from Software