2. Traditional LFSR
• LFSR is used to pseudo random bit generator.
• It is usually a shift register with some flip-flop
outputs XOR ed and fed back into the first flip-
flop.
Simplified circuit of a generic n-bit LFSR[1]
7. CONCLUSION
• Reduction in power is about 10% after applying
clock gating in LFSR.
• There is an overhead of 12 transistors per clock
gating circuit and it also dissipates power.
8. References
• Walter Aloisi and Rosario Mita, Member, IEEE,
“Gated clock design of Linear Feedback Shift
Register,” Ieee transactions on circuits and
systems—ii: express briefs, vol. 55, no. 6, JUNE
2008