新規Microsoft Office Word 文書 · 2020-02-26 · >Ì >Ì >Ì >Ì >Ì >Ì...

…

MRAM

μ μ

μ

3

( )

3

*

23 24 25 26 27

PL PL /

-1

-2 -3

-4

1

5-3

μ

μμ

μ

μμ

•

STT-MRAM

20nm20nm

• .• .• .

STT-MRAM SRAM

(A)

(s)

1x10-10 1x10-9 1x10-8 1x10-7

1x10-5

1x10-4

1x10-3

1x10-2

1 Spintech APL 2009 .2 J. Phys. D 20123 IBM APL 20114 Spintech APL 2011

Order-1

Order-2

Order-3

Order-4

43

21

μμ

•

•

RWL WWL

SWL MTJ

WL

WWL MTJ MTJ

WL

MTJ MTJ

IEDM2012 IMW2013 VLSI Circuit 2013

(a) D-MRAM (b) 3T-2MTJ (c) 2T-2MTJ (d) 4T-2MTJ

0.1

1

10

bzip2 gobmk h264ref xalancbmk gromacs namd calculix lbm

Nor

mal

ized

1M

B-8

way

L2$

pow

er 2MTJ-6T

2MTJ-4T

1MTJ-3T (advanced p-MTJ this work) 1MTJ-3T (referenced p-MTJ)

Normally - Off

Normally - On

SRAM AMAMAMRRRS MS MRRARAMS MS MRASRAMSRAM

100 m

XD

EC

READ & WRITE1K BL

1K W

L

XD

EC

PDEC

4:1MUX

256Rx256C

4:1MUX

256Rx256C

4:1MUX

256Rx256C

4:1MUX

256Rx256C

DriverSA

Rep

eate

r

4:1MUX

256Rx256C

4:1MUX

256Rx256C

4:1MUX

256Rx256C

4:1MUX

256Rx256C

DriverSA

Volta

ge (V

)

Access time (ns)

Pass

Fail

1.2

1.1

1.0

0.9

0.83 4 5 6

0.0

2.0

4.0

6.0

8.0

10.0

0 0.2 0.4 0.6 0.8 1

[A]

[s]

4.2 A

: “Normally-On”: “Normally-On” or “ ”.

Vcc

Micro-controller

Network

Input

Sensor 0

Sensor n

Sensor 1

Input

Sensor Modules

Sensor-netn

SensorControl

SensorControl

SensorControl

Control Sig.

CPU

Sensor-netInterface

VDC

DataIF Peripheral

PowerControl

POR

OSC

Memory

Control Sig.

n

RTC

Vcc-1 Vcc-2

Normally-Off Power ManagerPower Statement Register

Vcc-3

Sensor data buffers

Normally-On

Normally-Off Normally-Off

-> “Normally-Off”

-> “Normally-Off”

I/F

SapplicationSidle_time

Stotal

time

Power

μ μ μ

C0-state

C1/C2-state

C3-state

C4-state

C6-state

M1-state

M4-stateM3-state

1nsec 30 sec 60 sec 400 sec

200nsec20 secIdle time

Average PowerPower

output

Ener

gy[

uJ]

Sensing interval[s]

μ

I/FHW/SW

/ I/FI/F

CPU