The LSI Logic LSI8955U is a high performance single-channel 64-Bit Ultra160 SCSI controller with LSI53C1010 chipset.  It is also compatible with 32-Bit or 33-Mhz PCI slots.

Note: It is an OEM card for HP. HP Part Number is 5184-3856. It is compatible with non-HP computers. HP doesn't do anything to it except putting a HP label on it.

The LSI8955U is a single-channel Ultra160 SCSI host adapter board built with the LSI53C1000 controller. It supports the Ultra160 initiative with support for double transition clocking, Cyclical Redundancy Check (CRC) and SureLINK™ enhanced domain validation. Domain validation tests link integrity and ensures that the system is adequate for Ultra160 SCSI data transfers, which provide robust system operation.

L S I 5 3 C 1 0 0 0 C O N T R O L L E R

The LSI53C1000 single-channel Ultra160 controller provides the PCI and SCSI functionality for the LSI8955U host adapter board.

P C I I N T E R F A C E

The LSI8955U host adapter board has a 64-bit PCI interface which is backward compatible with 32-bit/66MHz PCI. Dual Address Cycle (DAC) support allows for increased addressability. The LSI8955U host adapter board is PCI 2.2 compliant and provides support for PCI power management, Subsystem Vendor ID, Vital Product Data (VPD), and Extended access cycles (MRL, MRM, MWI).

S C S I  I N T E R F A C E

The LSI8955U supports the Ultra160 SCSI initiative including double transition clocking, CRC (Cyclic Redundancy Check) and domain validation.  Double transition clocking refers to transferring data on both polarity edges of the clock signal. It is used in the data phases to perform data transfers on both edges of the REQ or ACK. CRC is a 32-bit error correction scheme to ensure robust error from data transfers at Ultra160 speeds.