32579B

General Configuration Block

Table 4-8. Clock Generator Configuration (Continued)

Bit

Description

Offset 1Eh-1Fh

Core Clock Frequency Control Register - CCFC (R/W)

Reset Value: Strapped Value

This register controls the configuration of the core clock multiplier and the reference clocks.

15:14

Reserved.

13Reserved. Must be set to 0.

12Reserved. Must be set to 0.

11:10

Reserved.

9:8

FPCICK (Internal Fast-PCI Clock). (Read Only) Reflects the internal Fast-PCI clock and is the input to the GX1 module

 

that is used to generate the core clock. These bits reflect the value of strap pins CLKSEL[1:0].

 

00:

33.3 MHz

 

01:

48 MHz

 

10:

66.7 MHz

 

11:

33.3 MHz

 

 

7:4

Reserved.

 

 

3:0

MVAL (Multiplier Value). This 4-bit value controls the multiplier in ADL. The value is set according to the Maximum Clock

 

Multiplier bits of the MCCM register (Offset 10h). The multiplier value should never be written with a multiplier which is differ-

 

ent from the multiplier indicated in the MCCM register.

 

0100:

Multiply by 4

 

0101:

Multiply by 5

 

0110:

Multiply by 6

 

0111:

Multiply by 7

 

1000:

Multiply by 8

 

1001:

Multiply by 9

 

1010:

Multiply by 10

 

Other:

Reserved

88

AMD Geode™ SC1200/SC1201 Processor Data Book

Page 88
Image 88
AMD SC1200 1514, Reserved. Must be set to 1110, 33.3 MHz, 66.7 MHz, Ent from the multiplier indicated in the Mccm register