Download AMD Geode SC1201 Specifications

32087C
System Services
12.1.10.12 Subfunction 20h - Get SCxxxx External Clock Speed
Description:
Returns the value of the single chip device’s clock speed in MHz.
Passed:
Parameter
Description
AX
BE20h
BX
4E53h (= ‘NS’)
Related Functions:
None.
Returns:
Parameter
Description
AX
Clock speed (MHz)
CF
0 = Success
1 = Failure
12.1.10.13 Subfunction 21h - Get SCxxxx Device Type
Description:
Returns the value of the single chip device’s number in the system (i.e., SC1100, SC1200, SC1201, SC2200,
SC3200).
Passed:
Parameter
Description
AX
BE21h
BX
4E53h (= ‘NS’)
CX
00h = Returns CPU type that GeodeROM was built with
01h = Returns CPU type reported by F5 60h
02h = Returns CPU type reported by CPU straps
Returns:
Parameter
EBX
CF
Description
Chip ID
0 = Success
1 = Failure
Related Functions:
None.
AMD Geode™ GeodeROM Functional Specification
143