One Interview Question with Answer!!!

[sakthikumaran87]

I was asked in an interview last week regarding the need of one-hot assignament technique and its advantage over binary assignment. latter i understood that binary coding will be synthesized into an binary adder whereas one-hot will be synthesized into shift registers. since there are no comb. bottleneck involved, one-hot can operate at a very high speed and preferred over binary assignment for coding FSM in high speed circuits.

One caution. During PNR one-hot technique is prone to Hold violations and hence needed to be documented properly and shared with backend guys.

 

[sumanth495]

hi sakthi,

nice information. one hot contains less combinational logic compared to binary FSM. so by using one-hot we can achieve more frequency.

keep posting more interview questions