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ICS952011 Datasheet, PDF (1/25 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4 processor
Integrated
Circuit
Systems, Inc.
ICS952011
Programmable Timing Control Hub™ for P4™ processor
Recommended Application:
SIS 645/645DX/648/650 style chipsets.
Output Features:
• 2 - Pairs of differential CPUCLKs (differential current mode)
• 1 - SDRAM @ 3.3V
• 9 - PCI @3.3V (including 2 free-running)
• 2 - AGP @ 3.3V
• 2 - ZCLKs @ 3.3V
• 1- 12/48MHZ @ 3.3V
• 1- 24/48MHz, @3.3V selectable by I2C
• 3- REF @3.3V, 14.318MHz.
Key Specifications:
• PCI - PCI output skew: < 500ps
• CPU - SDRAM output skew: < 1ns
• AGP - AGP output skew: <150ps
Features/Benefits:
• Selectable asynchronous/synchronous AGP, ZCLK and
PCI outputs
• Supports DDR333 OEM frequencies
• Programmable output frequency, divider ratios, output
rise/falltime, 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.
• For PC133 SDRAM system use the ICS9179-16 as the
memory buffer.
• For DDR SDRAM system use the ICS93735 or
ICS93732 as the memory buffer.
• Uses external 14.318MHz crystal.
Functionality
Bit2 Bit7 Bit6 Bit5 Bit4 CPU SDR
FS4 FS3 FS2 FS1 FS0 MHz MHz
0
0
0
0
0 100.20 100.20
0
0
0
0
1 100.20 133.60
0
0
0
1
0 100.20 200.40
0
0
0
1
1 100.20 167.00
0
0
1
0
0 133.60 100.20
0
0
1
0
1 133.60 133.60
0
0
1
1
0 133.60 200.40
0
0
1
1
1 133.60 167.00
0
1
0
0
0 200.05 100.03
0
1
0
0
1 200.05 133.37
0
1
0
1
0 200.05 200.05
0
1
0
1
1 200.05 160.04
0
1
1
0
0 166.70 100.20
0
1
1
0
1 166.70 133.36
0
1
1
1
0 160.04 200.05
0
1
1
1
1 166.70 166.70
1
0
0
0
0 100.20 100.20
1
0
0
0
1 100.20 133.60
1
0
0
1
0 100.20 200.40
1
0
0
1
1 100.20 167.00
1
0
1
0
0 133.60 100.20
1
0
1
0
1 133.60 133.60
1
0
1
1
0 133.60 200.40
1
0
1
1
1 133.60 167.00
1
1
0
0
0 200.05 100.03
1
1
0
0
1 200.05 133.37
1
1
0
1
0 200.05 200.05
1
1
0
1
1 200.05 160.04
1
1
1
0
0 166.70 100.20
1
1
1
0
1 166.70 133.36
1
1
1
1
0 160.04 200.05
1
1
1
1
1 166.70 166.70
AGP
MHz
66.80
66.80
66.80
66.80
66.80
66.80
66.80
66.80
66.68
66.68
66.68
66.68
66.68
66.80
66.68
66.68
66.80
66.80
66.80
66.80
66.80
66.80
66.80
66.80
66.68
66.68
66.68
66.68
66.68
66.80
66.68
66.68
PCI
MHz
33.40
33.40
33.40
33.40
33.40
33.40
33.40
33.40
33.34
33.34
33.34
33.34
33.40
33.40
33.34
33.34
33.40
33.40
33.40
33.40
33.40
33.40
33.40
33.40
33.34
33.34
33.34
33.34
33.40
33.40
33.34
33.34
ZCLK
MHz
66.80
66.80
66.80
66.80
66.80
66.80
66.80
66.80
66.68
66.68
66.68
66.68
66.68
66.80
66.68
66.68
133.60
133.60
133.60
133.60
133.60
133.60
133.60
133.60
133.37
133.37
133.37
133.37
133.60
133.60
133.37
133.37
Pin Configuration
VDDREF 1
**FS0/REF0 2
**FS1/REF1 3
**FS2/REF2 4
GNDREF 5
X1 6
X2 7
GNDZ 8
ZCLK0 9
ZCLK1 10
VDDZ 11
*(PCI_STOP#)PCICLK6 12
VDDPCI 13
**FS3/PCICLK_F0 14
**FS4/PCICLK_F1 15
*MODE0/PCICLK0 16
PCICLK1 17
GNDPCI 18
VDDPCI 19
PCICLK2 20
PCICLK3 21
PCICLK4 22
PCICLK5 23
GNDPCI 24
48 VDDSDR
47 SDRAM_OUT
46 GND
45 CPU_STOP#(PD#)*
44 CPUCLKT1
43 CPUCLKC1
42 VDDCPU
41 GNDCPU
40 CPUCLKT0
39 CPUCLKC0
38 IREF
37 GND
36 VDDA
35 SCLK
34 SDATA
33 Vtt_PwrGd/PD#(CPUSTOP#)*
32 GNDAGP
31 AGPCLK0
30 AGPCLK1
29 VDDAGP
28 VDD48
27 12_48MHz/SEL12_48#**
26 24_48MHz/SEL24_48#*~
25 GND48
48-SSOP
* Internal Pull-Up Resistor
** Internal Pull-Down Resistor
~ This output has 1.5X drive strength
0721A—07/29/03
 ▷