ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 623

• Manufacturer Part Number: ALXD800EEXJ2VD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of ALXD800EEXJ2VD

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Instruction Set
8.2.2
Testing for extended CPUID instruction support can be accomplished by executing a CPUID instruction with the EAX regis-
ter initialized to 80000000h. If a value greater than or equal to 80000000h is returned to the EAX register by the CPUID
instruction, the processor supports extended CPUID levels.
8.2.2.1
Extended function 80000000h (EAX = 80000000h) of the CPUID instruction returns the maximum extended CPUID sup-
ported levels as well as the processor vendor string.
After the instruction is executed, the EAX register contains the maximum extended CPUID levels supported. The maximum
extended standard CPUID level is the highest acceptable value for the EAX register input.
The EBX through EDX registers contain the vendor string of the processor as shown in Table 8-19.
8.2.2.2
Extended function 80000001h (EAX = 80000001h) of the CPUID instruction returns the processor type, family, model, step-
ping information in the EAX register, and the supported extended feature flags in the EDX register. The EBX and ECX reg-
isters are reserved. Table 8-20 provides a register map.
In the EDX register, each flag refers to a specific extended feature. Some of these features have protection control in CR4.
Before using any of these extended features, the software should check the corresponding flag. Attempting to execute an
unavailable extended feature can cause exceptions and unexpected behavior.
Table 8-21 on page 624 shows the EAX and EDX bit field formats when EAX = 80000001h and indicates if a feature is not
supported.
Note 1. The “Register” column is intentionally out of order.
AMD Geode™ LX Processors Data Book
Register
EDX[1]
EDX[0]
Register
(Note 1)
EAX
EBX
EDX
ECX
Register
EAX
EBX
ECX
EDX
Extended CPUID Levels
CPUID Instruction with EAX = 80000000h
CPUID Instruction with EAX = 80000001h
C0C0A13Dh
69746E65h
444D4163h
000005Axh
80000006h
68747541h
00000000h
00000000h
Returned
Contents
Returned Contents
Reset
Value
0
1
Table 8-18. CPUID Instruction Codes with EAX = 00000000
Table 8-19. CPUID Instruction with EAX = 80000000h
Table 8-20. CPUID Instruction with EAX = 80000001h
Description
VME. Virtual Interrupt Flag in VM86
FPU. Floating Point Unit On Chip
Description
Type/Family/Model/Step
Reserved
Reserved
Feature Flags
{DMAc}
{htuA}
{itne}
Description
Maximum Extended CPUID Level
Vendor ID String 1
Vendor ID String 2
Vendor ID String 3
Comment
Not supported
Comment
Comment
33234C
623