Avago Technologies LSI53C1020 - Manual (Page 32)

2-6 Functional Description
Version 2.4 Copyright © 2001–2004 by LSI Logic Corporation. All rights reserved.
LSI53C1020 firmware controls HB_LED/ (heartbeat LED). HB_LED/
indicates that the IOP is operational.
A 2-wire serial interface provides a connection to a nonvolatile external
serial EEPROM. The serial EEPROM stores PCI configuration
parameters for the LSI53C1020. Refer to
Section 2.6, “Serial EEPROM
Interface,” page 2-27 , for more information concerning the serial
EEPROM.
2.1.2 SCSI Channel Module Description
The LSI53C1020 provides one SCSI bus channel. An Ultra320 SCSI
core, a datapath engine, and a context manager support this SCSI
channel. Refer to
Section 2.4, “Ultra320 SCSI Functional Description,”
page 2-18 , for an operational description of the LSI53C1020 SCSI
channel.
2.1.2.1 Ultra320 SCSI Core
The Ultra320 SCSI core controls the SCSI bus interface.
2.1.2.2 Datapath Engine
The datapath engine manages the SCSI side of DMA transactions
between the SCSI bus and the host system.
2.1.2.3 Context Manager
The context manager is an ARM966E-S processor. It controls the SCSI
channel side of the LSI53C1020 Fusion-MPT architecture. The context
manager controls the outbound queues, target mode I/O mapping,
disconnect and reselect sequences, scatter/gather lists, and status
reports.