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Hi all,

I have just descovered this wonderful forum and am hoping you can save my degree! I have to have this problem finished in a matter of hours and just can't figure out the schematics/truth tables. Please please please take the time to help in any way with any part if you can - it shouldn't be too hard for some of you experts and I would be eternally grateful. Thanks in advance,

Oliver

Here are the tasks:

Design 1

Design a 4-bit BCD counter that counts from 0 to 9. After 9 the counter should cycle through the same sequence again.

Design 2

Design a 4-bit binary counter which counts in binary from 0 to 15 then cycles through the same sequence again.

Design 3

Design a 4-bit BCD counter that has a direction input (which determines the direction of the count). If direction = 0 the counter should count down, alternatively if direction = 1 then the counter counts up. The input may change at any time and the count must change appropriately at the next clock edge.

Design 4

Design a 4-bit binary counter that has a direction input (which determines the direction of the count). If direction = 0 the counter should count down, alternatively if direction = 1 then the counter counts up. The input may change at any time and the count must change appropriately at the next clock edge.

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# Please help me ly - D-Type Latch problem

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