Hardware Reference
In-Depth Information
High
Frequency
Power Consumption
Integration
Low
250nm
180nm
130nm
90nm
65nm
45nm
Technology
Fig. 1.4
Trend in semiconductor technology
100
Power-efficient
Heterogeneous Multicore
(Embedded system)
10
High-performance
Multicore
(PC/Server)
1
0.1
1
10
100
Power Consumption (W)
Fig. 1.5
Target of our heterogeneous multicore chip
the embedded systems. Our heterogeneous multicore technology is based on an
embedded processor core to achieve high power efficiency. In the embedded proces-
sor field, increasing the performance per watt has been one of the main objectives
since the 1990s [ 8- 16 ]. The MIPS (million instructions per second)-per-watt index
was created and has been used to try to increase those values for single CPU cores
[ 17- 24 ] . Figure 1.6a presents an example that shows the MIPS-per-watt improve-
ment of SuperHâ„¢ microprocessors (SH) that have been used in advanced embed-
ded systems. The first value for SH-1, which was developed using 0.8-m m technology,
was 30 MIPS/W in 1992. The 90-nm core used in SH-Mobile achieved over
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