Agilent Technologies 35670-90066 manual A7 CPU

Agilent 35670A	Circuit Descriptions
	A7 CPU

A7 CPU

The A7 CPU assembly controls the entire analyzer. It performs multiple tasks, such as:

•Initiating the power-up sequence and calibration routines

•Capturing front panel keystrokes

•Configuring the measurement hardware

•Processing input data from the A6 Digital assembly

•Controlling the A101 Display assembly

•Monitoring the hardware for faults or overloads

•Running the self tests

•Handling all data transfers for the fast bus, rear bus, and A100 Disk Drive assembly

MPU (Microprocessor) Controls the processor address bus and the buffered processor data bus. At power-up, this circuit initializes the analyzer from the information stored in the Monitor ROM. This circuit also processes interrupts from the Interrupt Handler and synchronizes data transfers on the processor data bus with the Data Transfer Handler. The MPU also has access to battery-backed-up SRAM on the A8 Memory assembly. This allows the CPU assembly to store and update information such as the analyzer’s address, default disk, and peripheral addresses.

Monitor ROM Stores the information used by the MPU to initialize the analyzer.

DSP and Floating Point Relieve the MPU of math intensive-tasks by supplying the computational power needed for

Math Co-processoraccurate, high-speed signal processing operations — for example, windowing and Fast Fourier Transform (FFT) for the analyzer’s narrow-band zoom mode. The DSP Co-processor is a high speed (40 MHz) math co-processor that performs complex mathematical operations. The Floating Point Math Co-processor performs floating point mathematical operations. The DSP Co-processor and Floating Point Math Co-processor work as slave co-processors to the MPU and the DSP Co-processor has its own RAM. This arrangement leaves the MPU free to perform other functions while the DSP Co-processor and Floating Point Math Co-processor perform math-intensive operations.

Interrupt Handler	Processes interrupts for the MPU. The Interrupt Handler sets the interrupt priority level and
	returns an interrupt acknowledge to the circuit that generated the interrupt. If the MFP
	controller causes an interrupt, the MPU reads a status byte from the MFP controller to
	determine the circuit that caused the interrupt.
Data Transfer Handler	Synchronizes data transfers in the analyzer with the MPU. When a data transfer occurs, the
	Data Transfer Handler notifies the MPU when the transfer is complete.
Clock Circuits	Provide the clocks for the CPU assembly and the A8 Memory assembly.

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