Background - Heterogeneous Multicore Processor Technologies for Embedded Systems - page 5

a b

MIPS/W

Performance
(MIPS)
10000

10000

6000

PC/
Server's

4500

1050

1000

720

300

1000

100

100

30

Embedded

100
0.01 0.1 1 10 100

10

SH1,2 SH3 SH4 SH-Mobile

Power Consumption (W)

1992 Æ

* MIPS: based on Dhrystone 2.1

MIPS/W of SH microprocessors Comparison of MIPS/W

Fig. 1.6 MIPS/W of embedded processors

Fig. 1.7 Various processor

High

Hardware
Acc.

cores

Highly
SIMD

Dynamic
Reconf.

Media
Proc.

Special
Purpose
Processor

DSP

CPU

Low

Low High

Flexibility

6,000 MIPS/W, which was 200 times higher than that of 15 years ago. When we
compare this with the other types of processors in Fig. 1.6b , we can see the excellent
power efficiency of the embedded processor [ 2 ] .
Our other policy is to effectively use heterogeneous parallelism to attain high
power efficiency in various digital-convergence applications. Now, various types of
processor cores other than CPU cores have been developed. Figure 1.7 shows exam-
ples of these processor cores, which are positioned in terms of flexibility and perfor-
mance per watt/performance per area.
The CPU is a general-purpose processor core and has the most flexibility. The
other processor cores are developed for special purposes. They have less flexibility