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ICS9248-199

Frequency Generator for SIS 735/740 with AMD K7 Processor

Integrated Circuit Systems 

ICS9248-199

Byte 18: Group Skew Control Register*

Bit

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Name

CPU_Skew 1

CPU_Skew 0

SD_Skew 1

SD_Skew 0

PCI_Skew 3

PCI_Skew 2

PCI_Skew 1

PCI_Skew 0

PWD

Description

1 These 2 bits delay the CPUclocks with

respect to all other clocks.

0 00 = 0ps 01 = 250ps 10 = 500ps 11 = 750ps

0 These 2 bits delay the SDRAM_OUT with

respect to CPUCLK

0 00 = 0ps 01 = 250ps 10 = 500ps 11 =750ps

0 These 4 bits can change the CPUCLK to

0

1

PCICLK skew from 1.4ns - 2.9ns. Each binary

increment or decrement of PCI_SKEW (3:0)

will increase or decrease the delay of the PCI

0 (F,0:1) clocks by 100ps.

Byte 19: Group Skew Control Register*

Bit

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Name

AGP_Skew 3

AGP_Skew 2

AGP_Skew 1

AGP_Skew 0

PCI_Skew 3

PCI_Skew 2

PCI_Skew 1

PCI_Skew 0

PWD

Description

0 These 4 bits can change the CPUCLK to

AGP skew from 1.4ns - 2.9ns. Default at

0 power up is - 2.5ns. Each binary increment or

1 decrement of AGP_SKEW (3:0) will increase

or decrease the delay of the AGP clocks by

0 100ps.

0 These 4 bits can change the CPUCLK to PCI

0

1

skew from 1.4ns - 2.9ns. Each binary

increment or decrement of PCI_SKEW (3:0)

will increase or decrease the delay of the PCI

0 (2:4) clocks by 100ps.

Byte 20: Group Skew Control Register*

Bit

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Name

APIC_Skew 3

APIC_Skew 2

APIC_Skew 1

APIC_Skew 0

REF0

REF1

IOAPIC

48MHz

PWD

Description

0 These 4 bits can change the CPUCLK to

APIC skew from 1.4ns - 2.9ns. Default at

0 power up is - 2.5ns. Each binary increment

1 or decrement of APIC_SKEW (3:0) will

increase or decrease the delay of the CPU

0 clocks by 100ps.

1 REF1 (Act/Inactive)

1 REF0 (Act/Inactive)

1 IOAPIC (Act/Inactive)

1 48MHz (Act/Inactive)

* These bytes are not available in ICS9248A/B/CF-199.

Programmable features on these bytes are only for ICS9248D/EF-199.

0376E—12/23/02

9

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