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The Digi SYNC/570 family of high-performance synchronous WAN communication adapters is the most cost-effective line of products for LAN-to-LAN, client-to-LAN, and client-to-IBM host connectivity. As complete hardware and software solutions, SYNC/570 products provide tightly integrated remote LAN connectivity for major operating environments including Novell NetWare and Windows NT. This makes them ideal branch and enterprise solutions where two to 16 ports per server are required. The product family includes two- and four- port models for ISA and PCI platforms. The PCI model offers a universal interface (UIB) capable of supporting a different interface on each port. No jumpers or switches are needed - simply connect the cable for the interface you want. All models have an advanced feature set allowing them to support line speeds better than T1/E1. These features include a design based on the Hitachi HD64570 Serial Communications Adapter (SCA) chip. This highly integrated subsystem supports two synchronous serial ports and four DMA channels, plus interrupt and timer logic. In addition, it has many protocol-specific features designed to maximize performance by minimizing driver overhead. The key to the SYNC/570's performance is its integral DMA-to-shared memory architecture. Its on-board 128K or 256K memory is directly addressable by both the system and the SCA's DMA. Program-initiated DMA transfers operate at DMA/memory speed independently of other system activity. This results in reduced system overhead and hardware line speeds up to 5 Mbps. For ease of use, the SYNC/570 family is software configurable. Shared memory is accessed through a 16K window that is assignable to any 16K boundary in the first 16MB of system memory. In addition, the memory is tri-stated, which allows multiple boards in a system to share a common window address.
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