User's Manual

Turbo PMAC PCI HRM
Jumper Summary 9
JUMPER SUMMARY
On the PMAC there are many jumpers (pairs of metal prongs), called E-points. Some have been
shorted together; others have been left open. These jumpers customize the hardware features of the
board for a given application and must be set up appropriately. The following is an overview of the
various PMAC jumpers grouped in appropriate categories. For a complete description of the jumper
setup configuration please refer to the PMAC PCI CPU Board E-Point Descriptions chapter of this
manual.
Power-Supply Configuration Jumpers
E85, E87, E88: Analog Circuit Isolation Control – These jumpers control whether the analog
circuitry on the PMAC PCI is isolated from the digital circuitry, or electrically tied to it. In the
default configuration, these jumpers are off, keeping the circuits isolated from each other (provided
separate isolated supplies are used).
E89-E90: Input Flag Supply Control – If E90 connects pins 1 and 2 and E89 is on, the input flags
(+LIMn, -LIMn, and HMFLn) are supplied from the analog A+15V supply, which can be isolated
from the digital circuitry. If E90 connects pins 1 and 2 and E89 is off, the input flags are supplied
from a separate A+V supply brought in on pin 59 of the J7 JMACH2 connector. This supply can be
in the +12V to +24V range, and can be kept isolated from the digital circuitry. If E90 connects pins 2
and 3, the input flags are supplied from the digital +12V supply, and isolation from the digital
circuitry is defeated.
E100: AENA/EQU Supply Control – If E100 connects pins 1 and 2, the circuits related to the
AENAn, EQUn and FAULTn signals will be supplied from the analog A+15V supply, which can be
isolated from the digital circuitry. If E100 connects pins 2 and 3, the circuits will be supplied from a
separate A+V supply brought in on pin 9 of the J9 JEQU connector. This supply can be in the +12V
to +24V range and can be kept isolated from the digital circuitry.