Chapter 4
Installing the Drive
Page 42
Filepro CFP4207 Series
Disabling the SCSI Bus Parity - CFP4207W
SCSI parity is always enabled in both directions, unless the E7 Parity disable
jumper is installed. Setting the jumper will cause the drive to ignore SCSI bus
parity in but it will continue to generate SCSI bus parity out.
Disabling SCSI Bus Terminator Power (TERMPWR) - CFP4207W
Power to the on-board terminators is provided by the higher of the voltage
supplied at Pins #17, 18, 51 & 52, J2 or the voltage level at the 5 Volt power
input to the drive minus one diode drop. Termination Power to external
terminators can be supplied by the drive through Pins #17, 18, 51 & 52, J2. The
signal output characteristics are described in chapter 5. The TERMPWR line
can be disconnected from the drive by removing Jumper E8.
Table 4-14
Disabling SCSI Bus TERMPWR
Jumper E8
Result
In
TERMPWR (J2, Pins #17, 18, 51 & 52) connected
to the drive's internal termination power.
Out
TERMPWR (J2, Pins #17, 18, 51 & 52) open
circuit.
Using the J5 Auxiliary Connector
External logic cabled to the J5 connector may be used to control certain
characteristics of the drive or access signals.
Table 5-15
J5 Auxiliary Connector Signal Definitions
Pin Number Signal Name
Pin Number Signal Name
1
- SEL0
2
- XTFALT
3
- SEL1
4
- VUNIQ
5
- SEL2
6
- SPSYNC
7
- SEL3
8
- XTACTV
9
- ENTERM
10
- GROUND
11
+5V
12
- FAULT
- SEL0
Bit 0 of the binary coded SCSI ID selection input. This signal has a value of 0
when it is negated and a value of 1 when it is asserted for the purpose of
selection or arbitration.
This signal is latched within 250 msec of the application of valid power to the
drive or optionally the negation of -RST.
