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Page 20
2.6
Front Panel LEDs
The 7142 PMC front panel has eleven LED indicators, as illustrated in
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
Rev.: B
Master LEDs
There are two yellow MAS LEDs, one for each Sync Bus (A or B). The MAS
LED illuminates when this 7142 PMC is the bus Master (see the Master Bus
A/B Control Register, Model 7142 Operating Manual #800.71420). The bus
Master generates all sync/gate/clock signals on the LVDS bus. When only a
single 7142 PMC is used, it must be a Master.
Terminate LEDs
There are two yellow TRM LEDs, one for each Sync Bus (A or B). The TRM
LED illuminates when this 7142 PMC bus is terminated (see the Master Bus
A/B Control Register, Model 7142 Operating Manual). When this 7142 PMC
is the last Slave unit or only unit on the Sync Bus, you must enable bus ter−
mination.
Over Temperature LED
There are several temperature/voltage sensors on the Model 7242 PCB. The
sensor thresholds are set by a PCI interface processor (see TWSI Port Regis−
ter, Model 7142 Operating Manual #800.71420). When an over−temperature
or over−voltage condition is indicated, the red TMP LED illuminates on the
front panel. In addition, an over−temperature/voltage interrupt is available
to a PCI interface processor.
NOTE:
You must set up the temperature/voltage sensors' serial port
following power on of the cPCI system.
Clock LEDs
There are two green CLK DET LEDs, one for each Sync Bus (A or B). Each
CLK DET LEDs illuminates when a valid sample clock signal is detected on
the associated Sync Bus. If the LED is not illuminated, then no clock has
been detected and no data from the input stream can be processed.
Overload LEDs
There are four red overload LEDs, one for each A/D input, labeled CH1,
CH2, CH3, and CH4 OV. Each LED is an indicator for an A/D overload
detection function in each LTC2255 A/D converter. When an overload
indication is set by the LTC2255, the associated OVLD LED illuminates. In
addition, an OVLD interrupt may be generated from each A/D overload
indication to the PCI interface processor.
Pentek Model 7342 Installation M anual
Figure
2−6.
MAS A, MAS B
TRM A, TRM B
TMP
CLK DET A, CLK DET B
CH1 − CH4 OV
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