IBM C2B 2.25 Brick On Sled carrier 128-pin HPC, SSA manual M Corporation

U S E R RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS

O E M F U N C T I O N A L S P E C I F I C A T I O N U L T R A S T A R X P ( D F H C ) SSA M O D E L S 1.12/2.25 G B - 1.0" H I G H

Termination

Bus termination of the - SYNC signals is internal to the drive. This signal has a 5.1K ohm pulled-up to the + 5 volt supply. A maximum of 30 drives can have their - SYNC line daisy chained together. Vio- lating this could damage the Master drive line driver on the - SYNC line

It is the using system's responsibility to provide the cable to connect the - SYNC line where needed, of the synchronized drives.

Bus Characteristics

−maximum Bus length = 6 meters

−2 micro-second negative active pulse (when sourced by drive)

−minimum of 1 micro-second negative active pulse when externally sourced

−0.8 volts = valid low input

−2.2 volts = valid high input

−0.4 volts = low output

−Vcc volts = High output

−30 milli-amps = maximum output low level sink current

The driver used for these two signal lines is a Open Drain buffer.

Source filename=SYNC I B M Corporation Page 71 of 87