Digital randomizer for on-chip generation and storage of random

Details Digital randomizer for on-chip generation and storage of random Digital randomizer for on-chip generation and storage of random

1995-01-06

1996-10-29

Mai, Tan V.

Boots, shoes, and leggings

380 46, 331 78, G06F 102, H04L 900, H03B 2900

Patent

active

055703070

ABSTRACT:
A purely digital randomizer system generates an undeterministic data block using standard cell library units and includes a random number generator. The generator preferably includes at least two metastable blocks that each include a plurality of D-type flip-flops. Each flip-flop is coupled to a dedicated free-running oscillator whose frequency is based on a relative prime number for each frequency leg. Each of the D-type flip-flops is also coupled to receive a common jitter clock signal. The flip-flops are thus forcibly operated in a metastable state by intentionally violating the flip-flop set-up or hold time margins of incoming data relative to the jitter clock. To further maximize entropy, the flip-flop outputs are exclusively `OR`d ("EX-OR'd") and then passed through first and second shift registers of uneven and preferably even and odd bit lengths. Preferably each shift register includes at least one metastably-operated D-type flip-flop, to further promote randomness. The shift register outputs are combined in an EX-OR tree are cross-fed back to the EX-ORs at the shift register inputs. The input from each shift register is then EX-OR'd and clocked out with a system clock to provide first and second channels of undeterministic data.

REFERENCES:
patent: 4769777 (1988-09-01), Bittle et al.
patent: 4799259 (1989-01-01), Ogrodski
patent: 4810975 (1989-03-01), Dias
patent: 4905176 (1990-02-01), Schulz

Affiliated with

Also associated with

Rating

Digital randomizer for on-chip generation and storage of random does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital randomizer for on-chip generation and storage of random , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital randomizer for on-chip generation and storage of random will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1790368