3.1.2 LSI21320 Dual Channel Host Adapters

The LSI Logic LSI21320 and LSI21320-R are dual channel Ultra320 SCSI to PCI-X host adapters that provide two Ultra320 SCSI channels. The SCSI Channel A interface is made through connectors J2 and J4. The SCSI Channel B interface is made through connector J3. See Figure 3.3 for details.

Features of the LSI21320 host adapters are

two independent Ultra320 SCSI channels

three SCSI connectors:

one external 68-pin high density connector

two internal 68-pin high density connectors

LVD/SE termination

LSI Logic Integrated Mirroring (IM) technology for boot volume and operating system protection (IM is for the LSI21320-R only)

Fusion-MPT architecture

Details of the LSI21320 and LSI21320-R host adapters are

J1: PCI and PCI-X, 64-bit, universal type board edge connector

J2: 68-pin high density cable right-angle external connector

J3 and J4: 68-pin high density right-angle internal connectors

J6: 4-pin low density unshrouded right-angle LED connector

Subsystem Vendor ID: 0x1000

Subsystem ID: 0x1040

During system initialization, the system loads the ID numbers into the Subsystem Vendor ID and Subsystem ID registers of the embedded SCSI controller.

Figure 3.3 illustrates the LSI21320 or LSI2120-R host adapter board.

3-4

Ultra320 SCSI Host Adapter Characteristics

Version 2.1

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