Embedded Systems Design, 2nd Edition

36 Embedded systems design

Feature i486DX2-40 i486DX2-50 i486DX2-66

Address bus 32 bit 32 bit 32 bit

Data bus 32 bit 32 bit 32 bit

FPU present Yes Yes Yes

Memory management Yes Yes Yes

Cache on-chip 8K unified 8K unified 8K unified

Branch acceleration No No No

TLB support No No No

Superscalar No No No

Frequency (MHz) 40 50 66

Average cycles/Inst. 1.03 1.03 1.03

Frequency of FPU =CPU =CPU =CPU

Upgradable Yes Yes Yes

Address range 4 Gbytes 4 Gbytes 4 Gbytes

Frequency scalability No No No

Transistors 1.2 million 1.2 million 1.2 million

Voltage 5 and 3 5 and 3 5

Feature i486SX i486DX i486DX-50

Address bus 32 bit 32 bit 32 bit

Data bus 32 bit 32 bit 32 bit

FPU present ...