A non-volatile Flip-Flop in Magnetic FPGA chip

W.Zhao, E. Belhaire, V. Javerliac, C. Chappert, B. DienyDesign and Test of Integrated Systems in Nanoscale Technology,

pp.323-326, 2006

指導老師 : 魏凱城 老師

學 生 : 蕭荃泰

日 期 : 97 年 4 月 14 日

彰化師範大學積體電路設計研究所

Outline Abstract Magnetic Flip-Flop Magnetic Standard Non-Volatile Flip-Flop MSFlip-Flop Simulation Conclusion

Abstract The propose a non-volatile flip-flop, which presents

simultaneously low power dissipation and high speed.

This flip-flop is based on MRAM (Magnetic RAM) technology on standard CMOS.

In this non-volatile flip-flop design, we use Magnetic Tunnel Junctions (MTJ) as storage element.

In this paper, a magnetic flip-flop is proposed to make the FPGA circuit completely non-volatile.

Magnetic Flip-Flop

Fig1. the position of MTJs

Magnetic tunnel junction (MTJ) structure consisting of two ferromagnetic metals separated by a thin insulating layer.

Fig3. Magnetic Flip-Flop structuresFig2. SRAM based Master-Slave Flip-Flop structure

Fig4. schema of SRAM based sense amplifier

Fig5. Magnetic writing circuits

0

0

0

1

1

0

1

1

The simulation of magnetic Flip-Flop

Fig6. (a) Magnetic Standard mixed Flip-Flop schema (b) Magnetic Standard mixed Flip-Flop symbol

(a) (b)

Magnetic Standard Non-Volatile Flip-Flop

MSFlip-Flop Simulation In the magnetic-standard flip-flop simulation, the low

frequency control signal “NW” is 10 KHz, the clock frequency is 500MHz and the input frequency is 250MHz.

130nm technologies have been used for the CMOS part, and a complete simulation model has been developed by CEA for the magnetic part.

Fig7. The simulation results of magnetic standard non-volatile Flip-Flop. The last Data saved in MTJ is ‘1’

Fig8. The simulation results of magnetic standard non-volatile Flip-Flop. The last Data saved in MTJ is ‘0’

The flip-flop keeps the non-volatility of 1/X times (X is the ratio of processing frequency and the low, user defined frequency)

Conclusion We proposed this new architecture of Magnetic

Standard flip-flop which features simultaneously non-volatility, high speed and low power dissipation.

This flip-flop can also be used to replace all the registers in SOC (System-on-chip) then makes these chips non-volatile and secure.

The end