Embedded Systems Design, 2nd Edition

34 Embedded systems design

Feature i386SX i386DX i386SL

Address bus 24 bit 32 bit 24 bit

Data bus 16 bit 32 bit 16 bit

FPU present No No No

Memory management Yes Yes Yes

Cache on-chip No No Control

Branch acceleration No No No

TLB support No No No

Superscalar No No No

Frequency (MHz) 16,20,25,33 16,20,25,33 16,20,25

Average cycles/Inst. 4.9 4.9 4.9

Frequency of FPU =CPU =CPU =CPU

Address range 16 Mbytes 4 Gbytes 16 Mbytes

Frequency scalability No No No

Transistors 275000 275000 855000

Voltage 5 v 5 v 3 v or 5 v

System management No No Yes

Intel i386 feature comparison

INTEL 80486

The Intel 80486 processor is essentially an enhanced 80386. ...