a how many clock cycles dos an asynchronous parallel load ta

a: how many clock cycles dos an asynchronous parallel load take?

b: how many clock cycles does a synchroous parallel load take?

c: what value will a presetable counter go to if is reset?

Solution

asynchronous parallel load means that load will be sensed asynchronously

Changes take place immediately

Does not wait for the clock..

synchronous: Waits for the clock.

Output changes only at the rising edge of clock.

Counter is going to count number of clock pulses applied to it. Maximum count that binary counter can count is 2ⁿ- 1.

Presettable:
This means when the LoaD input is high, then whatever binary value is present on LOAD INPUTS, will be immediately copied to the outputs and stay that way until LD goes low. This enables the counter to begin from any value. eg count from 1 rather than 0. It can also count down from a preset value to zero and use the CARRYOUT as a sugnal that zero has been reached. Note this only works if the RESET input is low.