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.

Author: Faurr Tygor
Country: Central African Republic
Language: English (Spanish)
Genre: Education
Published (Last): 25 April 2012
Pages: 258
PDF File Size: 12.60 Mb
ePub File Size: 20.73 Mb
ISBN: 644-3-44733-660-1
Downloads: 28965
Price: Free* [*Free Regsitration Required]
Uploader: Dodal

The result is that a quartz crystal behaves like a circuit composed of an inductor, capacitor and resistor, with a precise resonant frequency See Interfacng circuit in Figure 4 Figure interfcaing Year Two Homework — Thursday 12th September Clock Generator A 2. The Crystal – Workplace Futures Conference. 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 to other A chips.

Motion Diagram Worksheet 1. Clock Generator The A can derive its basic operating frequency from one of two sources: Note that this frequency is just for simulation purposes in real implementation a crystal of 15M Hz is used.

READY is cleared after the guaranteed hold time to the processor has been met.

Clock Generator 8284A

The reset time is determined by the capacitor charging timing which can be calculated using the following RC charging formula: Modify “stop time” to ms and uncheck the “initial DC clok box as illustrated in the figure.

This property is known as electrostriction or inverse piezoelectricity. The functions of these pins are briefly discussed in next paragraphs refer to the A data sheet for more details. Documents Flashcards Grammar checker. Add clock and reset terminals Section 4.


The crystal frequency should be selected at three times the required CPU clock. Snowflakes — unique Assembly Presentation. Get the required circuit components from the Library. The 82C84A provides a schmitt trigger input so that an RC connection can be used to establish the power-up reset of proper duration.

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

Measure the minimum reset time using analog analysis Section 4.

Minimum System Requirements Clock Generator Memory Interfacing.

The first task will be accomplished in this experiment, while the second part will be deviated to the next experiment. The crystal frequency is 3 times the desired processor clock frequency. This phase involves two main tasks: Its timing characteristics are determined by RES. This requirement can be achieved colck a simple RC circuit as will be explained later in this experiment.

Clock Generator A

Two types of crystal oscillator. TPR O-chem Chapter 2. Current and Voltage Relationship for a Capacitor: The input signal is a square wave 3 times the frequency of the desired CLK output. The CPU uses time multiplexing for the Address, data, and some status lines. Unit 5 Day Interfcing the simulation and determine the frequency and duty cycle of the three clock outputs: Interface the crystal circuit to the A Section 4.

Its frequency systemm equal to that of the crystal. The Clock Generator.

Minimum System Requirements Clock Generator Memory Interfacing. – ppt download

Discuss the pin configurations and operations of the A clock generator. This circuit provides the following basic functions or signals: Dummy Crystal Crystal 3. The A generates three clock signals: Cluster of natural quartz crystals.


Interface the reset circuit to the A Clkck 4. The analog analysis simulation shows that the capacitor charge will reach 2. Create a motion diagram.

A crystal oscillator See Figure 1 is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of interfcing material to create an electrical signal with a very precise frequency.

Calculate the minimum reset time mathematically Section 4.

Documents Flashcards Grammar checker. This requirement can be achieved by using the reset circuit discussed above with properly selected values for the resistor and capacitor. The two AEN signal inputs are useful in system configurations which permit the processor to access two multi-master system busses.

When the field is removed, the quartz will generate an electric field as it returns to its previous shape, and this can generate a voltage. This phase involves making the basic connections of the microprocessor in minimum mode and interfacing the A clock generator. The purpose of these terminals is allow the clock signal ssystem reset logic to be connected to the design sheet which will be added to our project in the next LAB experiment.

Note interfacingg in order to perform the analog analysis, you need to disconnect the line from the RES of the A. The most common type of piezoelectric resonator used is the quartz crystal See Figure 2so oscillator circuits incorporating them became known as crystal oscillators Figure 1: Click on the “Add Trace” button and then select the voltage probe signal Interdacing as illustrated in the figure.