1.2.2 SCSI Interface

The SCSI interface is made through connectors J2 and J4. Figure 2.1 shows the location of these connectors. The SCSI interface includes these features:

•Provides one wide Ultra160 SCSI channel

•Provides two connectors:

–68-pin VHDCI for the external connection

–68-pin high density for the internal connection

•Supports SE and LVD signaling: 16-bit SE or LVD interfaces

•Supports LVD/SE termination

•Supports Fast, Ultra, Ultra2, and Ultra160 data transfer capability

–Ultra160 SCSI LVD synchronous transfers at up to 160 Mbytes/s

•Supports Domain Validation, Double Transition (DT) data transfers, and Cyclic Redundancy Check (CRC)

•Supports variable block size and scatter/gather data transfers

•Protects nondata phases with Asynchronous Information Protection (AIP)

•Supports two termination control options:

–Use manual shunts on connector J2 and J4 to disable termination

–Provide software control using GPIO3 to enable or disable the terminators

•Supplies SCSI termination power (TERMPWR) source with autoresetting circuit breaker

•Includes SCSI Plug and Play

•Provides Flash EEPROM for BIOS configuration storage

•Includes 8 Kbytes internal RAM for SCRIPTS instruction storage

•Provides a SCSI activity LED connector (J3)

Features

1-3

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