De multiplexing address data bus, Electrical Engineering

De multiplexing Address Data Bus (AD7- AD0)

As it is already discussed that  lower  order address bus (A7- A0)  is multiplexed  with data bus (D7- D0). Hence  pins for  these two  things  are denoted by (AD7- AD0). Microprocessor provides address during  earlier part of  the operation on  these  pins. Then  provides  data on the same pin during  later part of the  operations  ( see  timing  diagram also in chapter7).

ALE  ( Address  Latch Enable )  signal is used to de multiplex  these  address data bus.

ALE   goes high  during  earlier part of the operation  which  enable the  latch (see fig) when  the latch ( 74LS373) is  enabled  the address  supplied by  the microprocessor is  available  on the order  side for  the latch  on the low order address bus.  The high  order address is always available on  A15 - A8 line which  are dedicated for high order address only. In  this way  complete  address is available line  the address  bus (A15 - A0) which  will memory address is  located on the primary memory  of the microprocessor. Once  the  memory  address is located ALE goes low  which  disables the  latch  hence blocks the bits  available  on multiplexed lines(AD7 -AD0) which  may flow  from microprocessor  to memory  ( or I/ O) or vice  versa.

Posted Date: 4/4/2013 3:49:17 AM | Location : United States







Related Discussions:- De multiplexing address data bus, Assignment Help, Ask Question on De multiplexing address data bus, Get Answer, Expert's Help, De multiplexing address data bus Discussions

Write discussion on De multiplexing address data bus
Your posts are moderated
Related Questions
Explain the Construction of Synchronous Machines? Basically all synchronous machines require a DC excited field winding in order to produce magnetic flux. For majority of machi

Clipper Circuits: Clipper circuit have ability to Clipper of portions of the input signals without distorting the remaining part of the alternating wave form. Clamper net

Q. The response y(t) of a linear system to a unit-step excitation is y(t) = (4 - 10e -t + 8e -2t )u(t). (a) Find the system function. (b) Find the frequency at which the fo

Using the LM741operational amplifier build a voltage amplifier with the voltage gain of  |A V | = 500 v/v ± = 20%. Measure all necessary parameters of the amplifier (as per deliver

Q. What is Schokleys Equation. Find out a relation between Vgs and Ids? Schokleys Equation is used for defining the relation between the Gate source voltage and the Drain curre

What is expanded memory system? EMS: The area at location C8000H-DFFFFFH is frequently open or free. Such area is used for the expanded memory system into a XT or PC system, or


Static Rotor Resistance Control Methods This method is used only for slip  ring induction motor in SRIM  3- phase  variable  resistor can be inserted in the rotor  circuit and

Q. Explain the ideal drain characteristics of the JFET? The JFET consists of a thin layer of n-type material with two ohmic contacts, the source S and the drain D ,along with t

1) only one pair of slip rings are required (to energise the rotating field coil) regardless of the number of phases produced by the alternator (three phases is common because of t