Patent ID: 7176525

Claim:
A microprocessor comprising: a CPU, a cache memory, a cache controller, a RAM, a clock controller, a serial interface, and an IC, said IC comprising: a substrate having an insulating surface, a semiconductor film comprising silicon over said substrate, said semiconductor film including a channel region; a pair of LDD regions in said semiconductor film with said channel region therebetween wherein said pair of LDD regions contain an impurity of one conductivity type at a first concentration; a pair of impurity regions in said semiconductor film adjacent to said pair of LDD regions wherein said pair of impurity regions contain an impurity of the same conductivity type at a second concentration higher than said first concentration; a gate electrode over said channel region with a gate insulating film therebetween wherein said gate electrode partly overlaps each of said pair of LDD regions, side walls formed on side surfaces of said gate electrode, and wherein each of said pair of impurity regions comprises a metal silicide.