AMD-K6 datasheet(187/346 Pages) AMD

187 / 346 page

Chapter 7

Power-on Configuration and Initialization

169

20695H/0—March 1998

AMD-K6® Processor Data Sheet

Preliminary Information

Table 26. Register State After RESET

State (hex)

Notes

GDTR

base:0000_0000h limit:0FFFFh

IDTR

base:0000_0000h limit:0FFFFh

0000h

LDTR

0000h

EIP

FFFF_FFF0h

EFLAGS

0000_0002h

EAX

0000_0000h

EBX

0000_0000h

ECX

0000_0000h

EDX

0000_056Xh

ESI

0000_0000h

EDI

0000_0000h

EBP

0000_0000h

ESP

0000_0000h

F000h

0000h

FPU Stack R7–R0

0000_0000_0000_0000_0000h

FPU Control Word

0040h

FPU Status Word

0000h

FPU Tag Word

5555h

FPU Instruction Pointer

0000_0000_0000h

FPU Data Pointer

0000_0000_0000h

FPU Opcode Register

000_0000_0000b

CR0

6000_0010h

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.

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