AMD-K6 Datasheet, PDF (187/346 Pages) Advanced Micro Devices – AMD-K6 Processor

20695H/0—March 1998
Chapter 7
Preliminary Information
AMD-K6^® Processor Data Sheet
Table 26. Register State After RESET
Register
State (hex)
Notes
GDTR
base:0000_0000h limit:0FFFFh
IDTR
base:0000_0000h limit:0FFFFh
TR
0000h
LDTR
0000h
EIP
FFFF_FFF0h
EFLAGS
0000_0002h
EAX
0000_0000h
1
EBX
0000_0000h
ECX
0000_0000h
EDX
0000_056Xh
2
ESI
0000_0000h
EDI
0000_0000h
EBP
0000_0000h
ESP
0000_0000h
CS
F000h
SS
0000h
DS
0000h
ES
0000h
FS
0000h
GS
0000h
FPU Stack R7–R0
0000_0000_0000_0000_0000h
3
FPU Control Word
0040h
3
FPU Status Word
0000h
3
FPU Tag Word
5555h
3
FPU Instruction Pointer
0000_0000_0000h
3
FPU Data Pointer
0000_0000_0000h
3
FPU Opcode Register
000_0000_0000b
3
CR0
6000_0010h
4
CR2
0000_0000h
Notes:
1. The contents of EAX indicate if BIST was successful. If EAX = 0000_0000h, BIST was successful.
If EAX is non-zero, BIST failed.
2. EDX contains the AMD-K6 processor signature, where X indicates the processor Stepping ID.
3. The contents of these registers are preserved following the recognition of INIT.
4. The CD and NW bits of CR0 are preserved following the recognition of INIT.
Power-on Configuration and Initialization
169