w83194br-655 Winbond Electronics Corp America, w83194br-655 Datasheet - Page 18

• Manufacturer Part Number: w83194br-655
• Description: Clock For Sis Chipsets Winbond Clock Generator
• Manufacturer: Winbond Electronics Corp America

7.15 Register 14: Reserved (Default: 10h)
7.16 Register 15: Spread Spectrum type Control (Default: 2Ch)
BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
INV_CPU
INV_ZCLK
SPSP_TYPE
SPSP1
SPSP0
ASKEW<2>
ASKEW<1>
ASKEW<0>
CPUT_DRI
SRCT_DRI
SPCNT<5>
SPCNT<4>
SPCNT<3>
SPCNT<2>
SPCNT<1>
SPCNT<0>
NAME
NAME
PWD
0
PWD
0
0
1
0
0
0
0
0
0
1
0
1
1
0
0
CPUT output state in during POWER DOWN or Stop mode assertion.
1: Driven
0: Tristate (Floating)
CPUC always tri-state (floating) in power down Assertion.
SRC_T output state in during POWER DOWN or Stop mode assertion.
1: Driven
0: Tristate (Floating)
SRC_C always tri-state (floating) in power down Assertion.
Spread Spectrum Programmable time, the resolution is 280ns. Default
period is 11.8us
Invert the CPU phase, 0: Default, 1: Inverse
Invert the ZCLK phase, 0: Default, 1: Inverse
Spread spectrum implementation method
1: Pendulum type, 0: Original
Spread Spectrum type select.
CPU1 to AGP skew control.
Skew resolution is 250ps
The decision of skew direction is same as ASKEW<2:0> setting
00: Down
01: Down
10: Center +/- 0.5%
11: Center +/- 0.25%
(2*Iref)
(6*Iref => STOP mode)
(2*Iref => POWER DOWN)
W83194BR-655/W83194BG-655
0.5%
- 14 -
1%
DESCRIPTION
DESCRIPTION