LSI LSI22915A, User Manual, Page: 44 / 50

3-4 Technical Specifications
Version 1.3 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
3.2.2 SCSI Interface
The SCSI interface operates as two 16-bit synchronous or asynchronous
SE/LVD buses. It supports Ultra160 SCSI protocols and 16-bit arbitration.
The LSI22915A provides automatic active differential SCSI termination
and supplies SCSI TERMPWR.
The SCSI interface uses connectors J1 and J3 for Channel A, and
connectors J7 and J4 for Channel B. Connectors J1 and J7 are 68-pin
VHDCI right-angle receptacles that protrude through the ISA/EISA
bracket. Connectors J3 and J4 are 68-pin high density latching
right-angle receptacles for internal SCSI connections.
3.2.3 LED Interface
The LED interface is a four-wire arrangement that allows you to connect
an LED harness to the board. J5 is the connector for both channels.
Table 3.2 lists the signal and pin numbers for this SCSI host adapter.
Each SCSI channel of the LSI22915A has four activity LEDs that
indicate the operating state of the channel:
•
SCSI Activity – Green LED, left edge of board
•
TERMPWR Shorted – Yellow LED, left edge of board
•
LVD Mode – Green LED, left edge of board in LVD Mode
•
TERMPWR Good – Green LED, left edge of board when TERMPWR
is above +3 V
Table 3.2 LED Connector Pinout
Signal Name Pin
A
_
LED+ 1
A_LED
−
2
B_LED
−
3
B_LED+ 4