what is one hot,zero one hot,zero one cold ?

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abhineet22

Joined: 25 Jan 2005
Posts: 109

26 May 2005 19:41 zero one hot

what is one hot,zero one hot,zero one cold assignment?and what r the applications.

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leeenghan

Joined: 28 Dec 2004
Posts: 125
Helped: 7

27 May 2005 2:48 zero-one-hot

Hi,

This is related to how the states are represented in state machine. That says there are only 5 possible states. One way is to represent this by 5 registers. In this case only 1 register will be 1 (one hot) or 0 (one cold). This way of representing states is good for:
- easier to code (in rtl)
- easy to decode the state (compare to say using 3 bit where 000 is state 1, 001 is state 2 etc)
- 2 transistons in the state register only when state change

Disadvantage is more register is needed compare to binary coding.

Regards,
Eng Han

jas_bakshi

Joined: 13 May 2005
Posts: 21
Helped: 1

27 May 2005 16:07 hot zero

hi

one hot is :
0001
0010
0100
1000

zero one hot :
0000
0001
0010
0100

zero one cold :
1111
1110
1101
1011
0111

these encoding styles use as many number of F/F's as many states we are using which is there main drawback.