bus and its termination is automatically enabled when it is connected to the end of the bus.
Important: To utilize Ultra160 SCSI performance, you must only have LVD devices on the bus. Do not mix any SE devices with LVD devices or the entire bus will drop to SE, limiting bus performance to Ultra SCSI levels.
LVD peripheral devices are normally terminated with external terminators, but are sometimes set with jumpers or with a switch on the peripheral. Refer to the peripheral manufacturer’s instructions and to the computer’s user’s manual for information on how to identify the terminator setting of each device and how to change it.
Caution: The autoenable/disable sensing feature on your LSI21003 may enable termination erroneously if it is directly cabled to another SCSI device or host adapter using the same sensing method. The LSI21003 senses SCSI devices by detecting the ground signal on conductor 22 of a
The LSI21003 automatically controls SCSI bus termination for four different bus configurations. The four bus configurations are:
•Connections for high density internal SCSI connections
•Connections to high and low density internal connectors
•Connections for external SCSI connection
•Connections to both internal and external SCSI connectors
These terminations are discussed below. Please note that only SE termination control is allowed on Channel A.
2.2.4.1 High Density Internal SCSI ConnectionsIf only internal SCSI device connections on the host adapter have been made, then terminate the last internal device on the SCSI bus. You must disable the termination on all other devices. Termination on the LSI21003 is automatically enabled for Channel A. The termination for Channel B is enabled all the time.
Installing the LSI21003 |