w83194br-pt Winbond Electronics Corp America, w83194br-pt Datasheet - Page 15

• Manufacturer Part Number: w83194br-pt
• Description: Stepless Via Pt Main Clock Generator
• Manufacturer: Winbond Electronics Corp America

7.13 Register 13: CPU to IOAPIC Skew Control (Default = A7h)
7.14 Register 14: CPU to PCI and IOAPIC Skew Control (Default = 90h)
7.15 Register 15: SEL24_48 and CPU to CPUCS skew Control (Default = 04h)
BIT
BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CPU_CPUCS_SKEW [2]
CPU_CPUCS_SKEW [1]
CPU_CPUCS_SKEW [0]
CPU_IOAPIC_SKEW [2]
CPU_IOAPIC_SKEW [1]
CPU_IOAPIC_SKEW [0]
CPU_AGP_SKEW [2]
CPU_AGP_SKEW [1]
CPU_AGP_SKEW [0]
CPU_PCI_SKEW [2]
CPU_PCI_SKEW [1]
CPU_PCI_SKEW [0]
FIX_AGP_PCI
SPCNT [5]
SPCNT [4]
SPCNT [3]
SPCNT [2]
SPCNT [1]
SPCNT [0]
SEL24_48
Reserved
Reserved
SEL [1]
SEL [0]
NAME
NAME
NAME
PWD
PWD
PWD
X
0
1
0
0
1
1
1
1
0
0
1
0
0
0
0
0
0
0
1
0
0
1
0
CPU to IOAPIC SKEW control
Reserved
Spread Spectrum Programmable time, the resolution is
280ns
CPU to PCI skew, Skew resolution is 340ps
Expand the skew direction is same as
CPU_PCI_SKEW [2:0] setting
CPU to AGP Skew, Skew resolution is 340ps
Expand the skew direction is same as
CPU_AGP_SKEW [2:0] setting
CPU to IOAPIC skew control, Skew resolution is 340ps
Expand the skew direction is same as
CPU_AGP_IOAPIC [2:0] setting
In power on reset period, it is a hardware-latched pin, and it
can be R/W by I2C control after power on reset period. 1-
> 24 MHz, 0->48MHz. Default is 48Mhz
Reserved
0:normal mode, 1: fix mode
AGP & PCI FIX frequency (PCI = AGP/2)
SEL [1:0] for AGP
CPU to CPUCS Skew, Skew resolution is 340ps
Expand the skew direction is same as
CPU_CPUCS_SKEW [2:0] setting
- 12 -
00: 72MHZ
10: 77NHZ
DESCRIPTION
DESCRIPTION
DESCRIPTION
11: 67MHZ
01:64MHZ
W83194BR-PT