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Block Diagram Description
3–6
1740A/1750A/1760 – Series Service Manual
Block Diagram 3
Microprocessor and Line Rate Controller
The heart of these instruments is a microprocessor. It controls all aspects of the
instruments operation. Where synchronous control signals are required a Line
Rate Controller is employed.
The 16-bit microprocessor has its program code stored in a Flash Erasable
Programmable Read-Only Memory (EPROM). The Non-Volatile Random
Access Memory (NOVRAM) stores all of the constants used by the Micropro-
cessor. The Random Access Memory (RAM) is used to move system level code
for execution by the Microprocessor. The Read-Only Memory (ROM) contains
Microprocessor code that is output on the 8 most significant bits to the data bus.
The Address Buffer is unidirectional to select the addresses in the storage
devices (RAM, ROM, and EPROM) while the Data Buffer is bidirectional for
two-way communication with the storage devices.
The control circuitry for the component circuit board (1760–Series) is controlled
by the Microprocessor. Some 1740A/1750A–Series instruments have the
XROM circuit board installed in this location to extend the Flash EPROM.
The Line Rate Controller is loaded from the Microprocessor, synchronized to the
incoming video reference, and outputs the synchronous switching signals that are
required to make the displays viewed on the CRT.
Two sync separators are used to time the line rate controller. One strips sync
from the internal video signal, while the second strips sync from the external
reference video. Two separators are required to support color field identification
(SCH).
Data from the Microprocessor is loaded into latches that are clocked by the Line
Rate Controller to lock their outputs to the incoming video signal.
The Readout State Machine interprets the readout instructions from the
Microprocessor and loads digital data into the DAC. Analog output of the DAC
drives the stroke generators to create the readout segments that are displayed on
the CRT.
Microprocessor
Component or XROM
Line Rate Controller
Sync Separators
Synchronous Outputs
Readout State Machine
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Содержание 1740A Series
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