1-6
SM 701730-01E
1.3 Function of Each ASIC
The following items describe the IC and the gate array function used in each assembly.
Analog Front-End Controller (AFC)
The AFC is a Bi-CMOS gate array. Its main functions are controlling the analog front-
end circuit and assisting the trigger circuit. It includes a PWM signal output circuit used
for D/A conversion, a parallel port, a serial port, a trigger hold-off circuit, an auto trigger
circuit, a TV trigger generator, a fast counter, and a slow counter.
Fast Trigger Logic (FTL)
The FTL is an ECL gate array. Its main functions include generation of trigger signals
according to the trigger functions, a trigger hold-off function, and control of the time-to-
voltage converter (TVC).
Pulse Width Detector (PWD)
The PWD is an analog IC. Using an internally-startable oscillator and an external
counter (AFC), it detects the pulse width for width triggering.
Time-to-Voltage Converter (TVC)
This is the analog IC that measures the internal sampling clock and trigger time, and
converts time to voltage.
Ring Buffer Memory Controller (RBC)
The RBC is a Bi-CMOS gate array. It performs primary processing of the data such as
the extraction of the sampled data, envelope, and box averaging. It also provides
functions for controlling the ring buffer memory and the interface to the acquisition
memory interface (AMI).
Acquisition Memory Interface (AMI)
The AMI is a CMOS gate array. Its functions include interfacing to the ring buffer
memory controller (RBC), interfacing to the graphic control processor (GCP), averaging,
history control, waveform computation, and auxiliary functions for the automated
measurement of waveform parameters.
Graphic Control Processor (GCP)
The GCP is a CMOS gate array. Its functions include interfacing to the acquisition
memory interface (AMI), graphic memory and character memory control, a waveform
drawing function (accumulated display, for example), built-in printer control, and display
data generation for the LCD.
CPU I/O Interface (CIO)
The CIO is a CMOS gate array. Its functions include interfacing to the CPU
(HD6417750SF) and the peripheral ICs, keyboard control, LED control, interrupt control,
and DMA selection.
Serial Bus Trigger Logic (STL)
The STL is a field programmable gate array. The STL can generate two types of serial
bus triggers: I
2
C bus triggers and SPI bus triggers.
