鈥?/div>
Almador Chipset has a DLL driving the clock buffer
*PD#
25
32
VDD3V66
path for the 3 buffer path 66.6 MHz outputs,
VDDA
26
31
GND
GND
27
30
SCLK
66Buf(0:2).
Vtt_PWRGD#
28
29
SDATA
Almador board level designs MUST use pin 22,
66Buf_1, as the feedback connection from the
clock buffer path to the Almador (GMCH)
56-Pin 300mil SSOP/TSSOP
chipset.
* These inputs have 150K internal pull-up resistor to VDD.
鈥?/div>
Supports spread spectrum modulation,
down spread 0 to -0.5%.
鈥?/div>
Efficient power management scheme through PD#,
CPU_STOP# and PCI_STOP#.
Key Specifications:
鈥?/div>
CPU Output Jitter <150ps
鈥?/div>
3V66 Output Jitter <250ps
鈥?/div>
66MHz Output Jitter (Buffered Mode Only) <100ps
Functionality
鈥?/div>
CPU Output Skew <100ps
Block Diagram
FS2
PLL2
48MHz_USB
48MHz_DOT
X1
X2
66MHz_IN
PLL1
Spread
Spectrum
CPU
DIVDER
Stop
3
3
ICS9250-38
FS1
0
0
1
1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
0
1
0
1
CPU
(MHz)
66.66
100.00
200.00
133.33
66.66
100.00
200.00
133.33
Tristate
TCLK/2
3V66
(MHz)
66.66
66.66
66.66
66.66
66.66
66.66
66.66
66.66
Tristate
TCLK/4
66Buff[2:0]
3V66[4:2]
(MHz)
66.66
66.66
66.66
66.66
66MHz_IN
66MHz_IN
66MHz_IN
66MHz_IN
Tristate
TCLK/4
PCI_F
PCI
(MHz)
33.33
33.33
33.33
33.33
66MHz_IN/2
66MHz_IN/2
66MHz_IN/2
66MHz_IN/2
Tristate
TCLK/8
Reserved
Reserved
0
0
0
0
1
1
1
1
Mid
Mid
Mid
Mid
XTAL
OSC
3V66_1/VCH_CLK
REF
CPUCLKT (2:0)
CPUCLKC (2:0)
PCICLK (6:0)
PCICLK_F (2:0)
66MHz_OUT (2:0)
3V66 (5:2,0)
I REF
PCI
DIVDER
Stop
7
3
PD#
CPU_STOP#
PCI_STOP#
MULTSEL0
FS (2:0)
SDATA
SCLK
Control
Logic
66MHz
DIVDER
3V66
DIVDER
3
5
Config.
Reg.
Reserved Reserved Reserved
Reserved Reserved Reserved
0404B鈥?2/23/02
next
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