Integrated
Circuit
Systems, Inc.
ICS952703
Preliminary Product Preview
Programmable Timing Control Hub for K7TM System
Recommended Application:
Features/Benefits:
SiS741 style chipset with 964 South Bridge.
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Selectable synchronous/asynchronous AGP/PCI
frequency
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Programmable output frequency.
Output Features:
Programmable output divider ratios.
Programmable output rise/fall time.
Programmable output skew.
Programmable spread percentage for EMI control.
Watchdog timer technology to reset system
if system malfunctions.
Programmable watch dog safe frequency.
Support I2C Index read/write and block read/write
operations.
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1 - Pair of differential open drain CPU outputs
1 - Single-ended open drain CPU output
1 - Pair of current mode differential serial reference clock
8 - PCICLK @ 3.3V including 2 PCI clock free running
2 - AGPCLK @ 3.3V
3 - REF @ 3.3V
2 - ZCLK @ 3.3V
2 - IOAPIC @ 2.5V
1 - 12_48MHz @ 3.3V
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Uses external 14.318MHz reference input.
1 - 24_48MHz @ 3.3V
Key Specifications:
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CPU Output Jitter <250ps
AGP Output Jitter <250ps
ZCLK Output Jitter <250ps
PCI Output Jitter <500ps
CPU-AGP/PCI/ZCLK skew: 2.5ns~3.5ns
Functionality
Pin Configuration
Bit3
FS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
Bit2
FS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
Bit1
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
Bit0
FS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
CPU
MHz
SRC
MHz
ZCLK
MHz
AGP
MHz
PCI
MHz
VDDREF 1
**FS0/REF0 2
**FS1/REF1 3
**Mode/REF2 4
GNDREF 5
48 VDDLAPIC
47 IOAPIC1
46 IOAPIC0
45 GNDAPIC
Bit4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
200.00
200.01
200.97
190.11
100.00
100.00
100.99
95.00
166.66
166.65
161.59
151.97
133.33
133.34
133.98
126.66
206.02
210.00
214.06
217.90
103.01
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
133.33
133.34
133.98
126.74
133.33
133.34
134.66
126.66
133.33
133.32
129.27
121.57
133.33
133.34
133.98
126.66
137.35
140.00
142.70
145.27
137.35
66.66
66.67
66.99
63.37
66.66
66.67
67.33
63.33
66.66
66.66
64.64
60.79
66.66
66.67
66.99
63.33
68.67
70.00
71.35
72.63
68.67
33.33
33.33
33.49
31.69
33.33
33.33
33.66
31.67
33.33
33.33
32.32
30.39
33.33
33.33
33.49
31.67
34.34
35.00
35.68
36.32
34.34
VDDSRC
44
X1 6
43 SRCCLKT
42 SRCCLKC
X2 7
GND
GNDZ 8
41
ZCLK0 9
40 CPUCLKODT1
GNDCPU
ZCLK1 10
39
38
37
36
35
34
33
32
31
30
29
28
27
CPUCLKODT0
CPUCLKODC0
AVDD
VDDZ 11
SCLK 12
VDDPCI 13
AGND
*FS2/PCICLK_F0 14
*FS3/PCICLK_F1 15
PCICLK0 16
IREF
1
0
0
1
0
0
1
0
0
1
0
1
SDATA
GNDAGP
PCICLK1 17
AGPCLK0
AGPCLK1
VDDAGP
GNDPCI 18
0
0
0
0
1
1
0
1
VDDPCI 19
PCICLK2 20
0
1
0
0
AVDD48
*(PCI_STOP#)PCICLK3 21
*(CPU_STOP#)PCICLK4 22
*(PD#)PCICLK5 23
GNDPCI 24
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
105.00
106.99
109.01
164.66
167.91
171.22
174.38
137.32
140.00
142.67
145.33
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
140.00
142.65
145.35
131.73
134.33
136.98
139.50
137.32
140.00
142.67
145.33
70.00
71.33
72.68
65.86
67.17
68.49
69.75
68.66
70.00
71.34
72.66
35.00
35.66
36.34
32.93
33.58
34.24
34.88
34.33
35.00
35.67
36.33
12_48MHz/SEL12_48#MHz*
26 24_48MHz/SEL24_48#MHz**~
25 GND48
48-SSOP
* Internal Pull-Up Resistor
** Internal Pull-Down Resistor
~ This output have 1.5X Drive Strength
0813B—05/17/05