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Explain the various modes in which DMAC works.
Working of Direct memory access controller:
The modes of operation has demand mode, block mode, single mode and cascade mode. Demand mode transfers data till an external EOP is input or till the DREQ input becomes inactive. Particular mode releases the HOLD after all byte of data transferred. Block mode automatically transfers the no. of bytes specified by the county register for the channel. Cascade mode is used while more than one 8237 is present into a system.
Give the names of four alloys along with their composition, which are used for making heater and thermocouple elements. Constantan or Eureka {(55 to 60 percent) Cu, (45 to 40 p
The power transferred across the air gap of a two pole inductionmotor is 24 kW. If the electromag netic power developed is 22 kW, find the slip. Calculate the output torque if the
Q. Why depletion MOSFET is known as "normally-on MOSFET" ? Draw the symbol of n-type and p-type depletion MOSFET. In depletion type MOSFET the drain current flows even when VGS
What are the Disadvantages of using robots - They can find it difficult to deal with 'unusual' circumstances for example a door is missing from a car waiting on the paint spra
Prepare a User Requirement Specification for the monitor and alarm system. User Requirements Specification should be written in a clear and unambiguous manner to state: • The
Give Illustration of AND and OR Gate - Microprocessor? Illustration: The image below demonstrate the 4 possible inputs into a 2-input AND gate and all the corresponding outputs
Explain the function of the pins PSEN and EA of 8051. PSEN: PSEN stands for program store enable. In 8051 based system in which an external ROM holds the program code, this pin
#question. . =calculate the calcium carbonate equivalent hardness of calcium sulphate of 5gms present in one litre
Characteristics of unijunction transistor: Characteristics : The static emitter characteristic of UJT at a given inter base voltage VBB in shown in fig. From fig., it is no
Permanent magnets are made of (A) Soft magnetic materials. (B) Hard magnetic materials. (C) Semi conductors. (D) Super conductors.
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