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

Ask an Expert

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

Write your message here..

Related Questions

Rc coupled amplifier over a single stage, Q. What is the advantage of a two... Q. What is the advantage of a two-stage overloaded RC coupled amplifier over a single stage one? What are it's uses? It is a frequently encountered configuration. Here, the tra

Explain negative test cases for testing mobile phones, Negative test cases... Negative test cases for testing mobile phones are: 1.taking out the SIM card and made a call  2. by invalid phone number 3. Made a call at which there is no tower signa

Section head, KBI''s KBI''s

Show that the force exerted on each charge, Q. Consider two 1-C charges sep... Q. Consider two 1-C charges separated by 1 min free space. Show that the force exerted on each is about one million tons.

Briefly explain single mode and multimode fibres, Briefly explain single mo... Briefly explain single mode and multimode fibres The optical fibres were categorized within two according to the number of modes it passes as: • Single mode fibres • Multi mode

Machine, explain inifinite bus explain inifinite bus

SUPERPOSITION THEOREM, CONCLUSION IN BRIEF OF SUPERPOSITION IN ASSIGNMENT CONCLUSION IN BRIEF OF SUPERPOSITION IN ASSIGNMENT

Installation of meters and verification of connections, Installation of Met... Installation of Meters and Verification of Connections Apart from testing and calibrating the meters they must be properly installed as per the links diagram. The points in wh

Four quadrant chopper or class e chopper , Four  Quadrant Chopper or Class... Four  Quadrant Chopper or Class E chopper                                                                    Figure class E chopper circuit  Mode I When

Inquire, how we can say that 3 phase induction motor is short curcited pra... how we can say that 3 phase induction motor is short curcited practically?