Technical data

1-8 Computer Group Literature Center Web Site
Hardware Preparation and Installation
1
!
Caution
The setting of the IP32 CSR bit (IP2 chip, register at offset
$1D, bit 0) must correspond to that of the jumper. The bit is
cleared (0) for 8MHz, or set (1) for 30/32MHz. If the jumper
and the CSR bit are not configured the same, the board may
not run properly.
SCSI Terminator Enable Header (J12)
The MVME172LX provides terminators for the SCSI bus. The SCSI
terminators are enabled/disabled by a jumper on header J12. The SCSI
terminators may be configured as follows:
Note If the MVME172LX is to be used at one end of the SCSI bus,
the SCSI bus terminators must be enabled.
Thermal Sensing (J13)
J13 is a two-pin header to access the M68060 THERM1 and THERM0
pins. These pins are connected to an internal thermal resistor that can be
used to provide information about the average temperature of the die. J13
is not configurable.
3
2
1
3
2
1
(Factory configuration)
J11
8MHz IP Bus Clock
J11
30/32MHz IP Bus Clock
(from MPU Bus Clock)
J12
2
1
2
1
J12
Onboard SCSI Bus Terminator Enabled
(Factory Configuration)
Onboard SCSI Bus Terminator Disabled