4-16 Theory of Operation
4.2.5 µP Control
Control between the microprocessor and the main board is accomplished via the
RPM. The RPM functions are:
• Processor interface
• MAM interface
• 8 bit bus interface (MTB411, MCG426, MST429A, IIC)
• Serial interface
• Min-Max Computation
• Histogram
• RPM is configured at boot up by the processor. The RPM configuration program
is stored in the flash memory.
4.2.6 Trigger
The different trigger couplings are :
• DC
• AC : cut off frequency is almost 7.5 Hz.
• LF REJ : single pole high pass filter with a cut off frequency at 50
kHz.
• HF REJ : single pole low pass filter with a cut off frequency at 50 kHz.
• HF : frequency divider by four.
Analog Controls
A sample and hold fed by the precision DAC provides the threshold levels. A
precision DAC is also used for a successive approximation ADC which measures
Probus inputs, temperature, etc.
4.2.7 Analog to Digital Converter
Introduction
The analog to digital converter system does the signal conversion to 8 bits, using
the following circuits:
• HSY632: Hybrid switching AMP 2 in 4 out.
• HAM631: Hybrid ADC 1GS/s with 4Mb memory. Provide 83 MHz clock for
memory and refresh for DRAM
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