Integrated
Circuit
ICS952004
Systems, Inc.
Programmable Timing Control Hub™ for P4™ processor
Recommended Application:
SIS 645/650 style chipsets.
Pin Configuration
VDDREF
**FS0/REF0
**FS1/REF1
**FS2/REF2
GNDREF
X1
1
2
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDSD
SDRAM
GNDSD
Output Features:
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
CPU_STOP#*
CPUCLKT_1
CPUCLKC_1
VDDCPU
GNDCPU
CPUCLKT_0
CPUCLKC_0
IREF
GNDA
VDDA
SCLK
SDATA
PD#*/Vtt_PWRGD
GNDAGP
AGPCLK0
AGPCLK1
VDDAGP
VDDA48
•
2 - Pairs of differential CPUCLKs (differential current mode)
•
•
1 - SDRAM @ 3.3V
8 - PCI @3.3V
X2
GNDZ
ZCLK0
ZCLK1
•
•
•
•
2 - AGP @ 3.3V
2 - ZCLKs @ 3.3V
1- 48MHz, @3.3V fixed.
1- 24/48MHz, @3.3V selectable by I2C
(Default is 24MHz)
VDDZ
*PCI_STOP#
VDDPCI
**FS3/PCICLK_F0
**FS4/PCICLK_F1
PCICLK0
PCICLK1
GNDPCI
•
3- REF @3.3V, 14.318MHz.
VDDPCI
PCICLK2
PCICLK3
PCICLK4
PCICLK5
GNDPCI
Features/Benefits:
48MHz
24_48MHz/MULTISEL*
•
Selectable asynchronous/synchronous AGP, ZCLK and
PCI outputs
GND48
•
Programmable output frequency, divider ratios, output rise/
falltime, output skew.
48-Pin 300-mil SSOP
•
•
Programmable spread percentage for EMI control.
Watchdog timer technology to reset system
if system malfunctions.
* These inputs have a 120K pull up to VDD.
** These inputs have a 120K pull down to GND.
•
•
Programmable watch dog safe frequency.
Support I2C Index read/write and block read/write
operations.
Block Diagram
PLL2
48MHz
•
•
•
For PC133 SDRAM system use the ICS9179-16 as the
memory buffer.
For DDR SDRAM system use the ICS93705 or
ICS93722 as the memory buffer.
Uses external 14.318MHz crystal.
24_48MHz
/ 2
X1
X2
XTAL
OSC
REF (1:0)
2
Key Specifications:
PLL1
Spread
Spectrum
CPU
DIVDER
CPUCLKT (1:0)
CPUCLKC (1:0)
Stop
2
•
•
•
PCI - PCI output skew: < 500ps
CPU - SDRAM output skew: < 1ns
AGP - AGP output skew: <150ps
2
ZCLK
DIVDER
ZCLK (1:0)
Functionality
2
6
Control
Logic
Bit 2 Bit 7 Bit 6 Bit 5 Bit 4 CPU SDRAM ZCLK
AGP
PCI
SDATA
SCLK
FS (4:0)
PCI
DIVDER
Stop
PCICLK (9:0)
PCICLK_F (1:0)
AGP (1:0)
FS4 FS3 FS2 FS1 FS0 (MHz) (MHz) (MHz) (MHz)
(MHz)
33.33
33.33
33.33
33.33
30.00
31.25
33.33
33.33
33.33
31.25
41.67
33.33
33.33
31.67
31.67
25.00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
66.67 66.67 66.67 66.67
100.00 100.00 66.67 66.67
100.00 200.00 66.67 66.67
100.00 133.33 66.67 66.67
100.00 150.00 60.00 60.00
100.00 125.00 62.50 62.50
100.00 160.00 66.67 66.67
100.00 133.33 80.00 66.67
100.00 200.00 66.67 66.67
100.00 166.67 62.50 62.50
100.00 166.67 71.43 83.33
80.00 133.33 66.67 66.67
80.00 133.33 66.67 66.67
95.00 95.00 63.33 63.33
95.00 126.67 63.33 63.33
66.67 66.67 50.00 50.00
2
2
PD#
AGP
DIVDER
PCI_STOP#
CPU_STOP#
MULTISEL
PD#/Vtt_PWRGD
Config.
Reg.
SDRAM
DIVDER
SDRAM
I REF
Power Groups
VDDCPU = CPU
VDDPCI = PCICLK_F, PCICLK
VDDSD = SDRAM
AVDD48 = 48MHz, 24MHz, fixed PLL
AVDD = Analog Core PLL
VDDAGP= AGP
VDDREF = Xtal, REF
VDDZ = ZCLK
Note: For additional margin testing frequencies, refer to Byte 4
0489D—05/05/05