De multiplexing address data bus, Electrical Engineering

Assignment Help:

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.


Related Discussions:- De multiplexing address data bus

Working of a negative clamping circuit, Q. Draw and explain the working of ...

Q. Draw and explain the working of a negative clamping circuit. The clamping network shown above is a negative clamping circuit that will clamp the input signal to a negative d

Explain the working principle of a triac, Q. Explain the working principle ...

Q. Explain the working principle of a TRIAC. "Triac" is an abbreviation for three terminal ac switch. 'Tri'-indicates that the device has three terminals and 'ac' indicates tha

Explain contact resistance, Explain Contact resistance. Contact resista...

Explain Contact resistance. Contact resistance: It is measured as the voltage drop from tail to tail of the mated contacts along with specified current flowing through the cont

Find the residual output offset voltage, Q. In order to minimize output vol...

Q. In order to minimize output voltage offsets in practical op-amp circuits, one provides a dc path from each input terminal to ground, makes each input terminal see the same exter

What do you mean by output voltage swing, Q. What do you mean by Output Vol...

Q. What do you mean by Output Voltage Swing? Ideally this is equal to the difference between the two supply rail voltages, although in practice it is a few volts less.

Illustrate the satellites in outer space, Illustrate the satellites in oute...

Illustrate the satellites in outer space Satellites in outer space transmit signals to Earth. Computers in vehicles (for example car, airplane or ship) receive and interpret th

Subtract registers and borrow from accumulator, Subtract Registers and Borr...

Subtract Registers and Borrow from Accumulator The  contents of the  register  and borrow  flag  are subtracted from   the contents of the accumulator and the  result is  store

Explain mesh analysis, Mesh analysis Analysis using KVL to solve for th...

Mesh analysis Analysis using KVL to solve for the currents around every closed loop of the network and hence verify the currents through and voltages across every elements of t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd