a difficult control input question - Electronic Circuits Projects Diagrams Free

transgalactic · 8th May 2008, 06:11 PM

http://s290.photobucket.com/albums/l...t=IMG_8838.jpg

the main problem comes when in one input i need to divide the number by 2
(subtract a zero from the original input)

while in other control input i need to multiply by two
(which meens to add a zero to the original input)

i dont know how to delete or add an output
when i have a certain control input

the number of outputs is constant

what should i do??

mneary · 8th May 2008, 11:13 PM

To divide, shift a zero in from the left, causing the least significant bit to be lost to the right. To multiply, shift a zero in from the right, causing a bit to be lost on the left. The problem with multiply is that if the multiply results in an overflow, the bit lost on the left (1) is gone forever and the answer is wrong.

transgalactic · 9th May 2008, 06:07 AM

but i dont have a shift register.
i need to implement it using four MUX 4-1 three AND two OR

how to build it using these components
?????

8th May 2008, 06:11 PM	#1 (permalink)
transgalactic Experienced Member Join Date: Apr 2008 Posts: 50	a difficult control input question http://s290.photobucket.com/albums/l...t=IMG_8838.jpg the main problem comes when in one input i need to divide the number by 2 (subtract a zero from the original input) while in other control input i need to multiply by two (which meens to add a zero to the original input) i dont know how to delete or add an output when i have a certain control input the number of outputs is constant what should i do??

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8th May 2008, 11:13 PM	#2 (permalink)
mneary Experienced Member Join Date: Feb 2007 Location: California Posts: 1,264	To divide, shift a zero in from the left, causing the least significant bit to be lost to the right. To multiply, shift a zero in from the right, causing a bit to be lost on the left. The problem with multiply is that if the multiply results in an overflow, the bit lost on the left (1) is gone forever and the answer is wrong.

9th May 2008, 06:07 AM	#3 (permalink)
transgalactic Experienced Member Join Date: Apr 2008 Posts: 50	but i dont have a shift register. i need to implement it using four MUX 4-1 three AND two OR how to build it using these components ?????