To Next Page

To Previous Page

3-1

18524C/0—Nov1996 AMD-K5 Processor Technical Reference Manual

Software Environment and

Extensions

The AMD-K5 processor is compatible with the instruction set,

programming model, memory management mechanisms, and

other software infrastructure supported by the 486 and Pen-

tium (735\90, 815\100) processors. Operating system and appli-

cation software that runs on the Pentium processor can be

executed on the AMD-K5 processor without modification.

Because the AMD-K5 processor takes a significantly different

approach to implementing the x86 architecture, some subtle

differences from the Pentium processor may be visible to sys-

tem and code developers. These differences are described in

Appendix A.

The AMD-K5 processor implements the following extensions to

the 486 architecture:

■ 4-Mbyte Page Size

■ Global Pages

■ Protected Virtual Extensions

■ Virtual-8086 Mode Extensions (VME)

■ Machine-Check Registers and Exceptions

■ Model-Specific Registers (MSRs)

■ Time Stamp Counter (TSC)

■ New Instructions: CPUID, CMPXCHG8B, MOV to and from

CR4, RDTSC, RDMSR, WRMSR, and RSM

■ I/O Breakpoints

Questions and Answers:

Need help?

Do you have a question about the AMD K5 and is the answer not in the manual?

AMD K5 Specifications

General