lecture 7: system clock. uction Figure 1:block diagram clock generator for the minimum mode to support the interface to the memory subsystem. Clock Generator. MICROCOMPUTER SYSTEM DESIGN. Clock Generator Functions. ▻ Crystal Oscillator. ▻ Pins. Interfacing to the The interfacing of the clock generator is shown in Figure If in a system there is more than one , then those entire clock generators need to.

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This phase involves making the basic connections of the microprocessor in minimum mode and interfacing the A clock generator. Note cock in order to perform the analog analysis, you need to disconnect the line from the RES of the A. The OSC has the same frequency as the crystal or the external frequency and can be used to test the clock generator or as and external frequency 32 Clock Generator A input intrfacing other A chips.

Documents Flashcards Grammar checker. Its timing characteristics are determined by RES. The reset time is determined by the capacitor charging timing which dlock be calculated using the following RC charging formula: Discuss the pin configurations and operations of the A clock generator.

Modify “stop time” to ms and uncheck the “initial DC solution” box as illustrated in the figure. Year Two Homework — Thursday 12th September Motion Diagram Worksheet 1.

The Clock Generator

Dummy Crystal Crystal 3. Create a motion diagram. The Crystal – Workplace Futures Conference.

Cloc phase involves two main tasks: Get the required circuit components from the Library. The crystal frequency should be selected at three times the required CPU clock. The 82C84A provides a schmitt trigger input so that an RC connection can be used to establish the power-up reset of proper duration.


Two types of crystal oscillator. Start the first phase of designing a single-board based microcomputer system. Unit 5 Day A crystal oscillator See Figure 1 is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. Clock Generator A 2. This property is known as electrostriction or inverse piezoelectricity. Documents Flashcards Grammar checker.

The input signal is a square wave 3 times the frequency of the desired CLK output. The purpose of these terminals is allow the clock signal and reset logic to be connected to the design sheet which will be added to our project in the next LAB experiment. Current and Voltage Relationship for a Capacitor: Internal construction of quartz crystal oscillators.

This requirement can be achieved using a simple Inteefacing circuit as will be explained later in this experiment.

Clock Generator 8284A

The result is that a quartz crystal behaves like a circuit composed of an inductor, capacitor and resistor, with a precise resonant frequency See RLC circuit in Figure 4 Figure 3: Click on the “Add Trace” button and then select the voltage probe signal Vc as illustrated in the figure.

Its frequency is equal to that of the crystal. Measure the minimum reset time using analog analysis Section 4. Interface the reset circuit to the A Section 4.

The 8284 Clock Generator

Add clock and reset terminals Section 4. The CPU uses time multiplexing for the Address, data, and some status lines.


Note that this frequency is just for simulation purposes in real implementation a crystal of 15M Hz is used. Snowflakes — unique Assembly Presentation. The functions of these pins are briefly discussed in next paragraphs refer to the A data sheet for more details. The A generates three clock signals: When the field is removed, intetfacing quartz will generate an electric field as it returns to its previous shape, and this can generate a voltage.


Clock Generator A

The two AEN signal inputs are useful in system configurations which permit the processor to access two multi-master system busses. Clock Generator The A can derive its basic operating frequency from one of two sources: The crystal frequency is 3 times the desired processor clock frequency. The first task will be accomplished in this experiment, while the second part will be deviated to the next experiment.

Interface the crystal circuit to the A Section 4. Run the simulation and determine the frequency and duty cycle of the three clock outputs: The analog analysis simulation shows that the capacitor charge will reach 2. The procedure to build the A interface circuit is summarized sysfem READY is cleared after the guaranteed hold time to the processor has been met. Cluster of natural quartz crystals.

Consider the RC circuit shown in the figure and answer the following questions: To complete the analog analysis intdrfacing on the “Simulate Graph” button as shown in Figure 4.