AMD-K6 Datasheet, PDF (50/346 Pages) Advanced Micro Devices – AMD-K6 Processor

AMD-K6^® Processor Data Sheet
Preliminary Information
20695H/0—March 1998
Control Registers
31
The five control registers contain system control bits and
pointers. Figures 19 through 23 show the formats of these
registers.
76543210
M
C
E
P
S
E
D
E
T
S
D
P
V
I
V
M
E
Symbol
MCE
PSE
DE
TSD
PVI
VME
Reserved
Description
Bit
Machine Check Enable
6
Page Size Extensions
4
Debugging Extensions
3
Time Stamp Disable
2
Protected Virtual Interrupts 1
Virtual-8086 Mode Extensions 0
Figure 19. Control Register 4 (CR4)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Page Directory Base
PP
CW
DT
Reserved
Symbol
Description
Bit
PCD
Page Cache Disable
4
PWT
Page Writethrough
3
Figure 20. Control Register 3 (CR3)
31
0
Page Fault Linear Address
Figure 21. Control Register 2 (CR2)
32
Software Environment
Chapter 3