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Features 1-3

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)

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