Data Comparison And General Interrupts; Data Compare Equal Output Pin; Operation Of General Control Latch Block - Fluke 9100 Series Service Manual

the module Main PCA protects the ground line.
becomes an input to the interrupt register (U13-8), along with the other
detection signals.

DATA COMPARISON AND GENERAL INTERRUPTS

The General Control Latch block outputs detection and interrupt signals
for any problems or special operations of the module. An external DCE
pin is also available for use as a "hardware interrupt".
The following two interrupts are produced by the General Control Latch
block:
o DCEINT- (Data Compare Equal Interrupt).
o IOGENINT- (I/O General Interrupt).
The Data Compare Interrupt
DCEINT- is generated by the module when the programmed data compare
registers match the input data. The DCEINT- signal originates from the
EQ pin of each custom chip. The EQ signals are gated to form a DCE-
signal. The DCE- signal triggers a J-K flip-flop to produce the DCEDET
and DCEINT- signals.
The I/O General Interrupt
IOGENINT- is an interrupt generated by the module when either pushbutton
on a clip module is pressed. The interrupt register on the module must
be read to determine the cause. In the case of a button push, two J-K
flip-flops output the SWLDET (A side) and SWRDET (B side) signals. These
signals are gated to produce the IOGENINT- signal.

DATA COMPARE EQUAL OUTPUT PIN

DCE output pin P1-6 can be used to trigger a logic analyzer or
oscilloscope. Buffers and protection circuitry safeguard the DCE signal
output.

OPERATION OF GENERAL CONTROL LATCH BLOCK

The General Control Latch block is divided into three areas. These areas
produce voltages for module operation and contain circuitry that
generates detection for a blown fuse. The functional block contains the
following areas:
o Threshold Voltage Detection.
o Multi-Detection and Interrupt.
o Fuse Blown Detection.
The FUSEDET signal
2-13
2/Theory of Operation