ICS952906A Datasheet, PDF (1/23 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for Next Gen P4™ processor

Integrated
Circuit
Systems, Inc.
ICS952906A
Programmable Timing Control Hub™ for Next Gen P4™ processor
Recommended Application:
VIA VN800/CN700/P4M800 style chipset for P4 processor
Output Features:
• 3 - 0.7V current-mode differential CPU pairs
• 10 - PCI, 3 free running, 33MHz
• 2 - REF, 14.318MHz
• 3 - 3V66, 66.66MHz
• 1 - 48MHz
• 1 - 24/48MHz
• 2 - 25MHz @ 2.5V
Features/Benefits:
• Programmable output frequency.
• Programmable asynchronous 3V66&PCI frequency.
• Programmable output divider ratios.
• 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.
• Uses external 14.318MHz reference input.
Key Specifications:
• CPU/SRC outputs cycle-cycle jitter < 125ps
• 3V66 outputs cycle-cycle jitter < 250ps
• PCI outputs cycle-cycle jitter < 250ps
• CPU - AGP skew < +/- 350ps
• AGP-PCI skew between 1~3.5ns
Functionality
Bit4 Bit3 Bit2 Bit1 Bit0 CPU
FS4 FS3 FS2 FS1 FS0
00000
00001
00010
00011
00100
00101
00110
00111
MHz
100.00
200.00
133.33
166.67
200.00
400.00
266.67
333.33
0 1 0 0 0 100.99
0 1 0 0 1 201.98
0 1 0 1 0 134.65
0 1 0 1 1 168.31
0 1 1 0 0 115.00
0 1 1 0 1 230.00
0 1 1 1 0 153.33
0 1 1 1 1 191.67
1 0 0 0 0 100.00
1 0 0 0 1 200.00
1 0 0 1 0 133.33
1 0 0 1 1 166.67
1 0 1 0 0 200.00
1 0 1 0 1 400.00
1 0 1 1 0 266.67
1 0 1 1 1 333.33
1 1 0 0 0 105.00
1 1 0 0 1 210.00
1 1 0 1 0 140.00
1 1 0 1 1 175.00
1 1 1 0 0 110.00
1 1 1 0 1 220.00
1 1 1 1 0 146.66
1 1 1 1 1 183.34
1236A—08/06/07
AGP
MHz
66.67
66.67
66.67
66.67
66.67
66.67
66.67
66.67
67.33
67.33
67.33
67.32
76.67
76.67
76.66
76.67
66.66
66.66
66.66
71.43
66.66
66.66
66.66
66.66
69.99
69.99
69.99
69.99
73.33
73.33
73.33
73.33
PCI
MHz
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.66
33.66
33.66
33.66
38.33
38.33
38.33
38.33
33.33
33.33
33.33
35.71
33.33
33.33
33.33
33.33
35.00
35.00
35.00
35.00
36.66
36.66
36.66
36.66
Pin Configuration
*FS1/REF0 1
**FS0/REF1 2
VDDREF 3
X1 4
X2 5
GND 6
**FS2/PCICLK_F0 7
**FS4/PCICLK_F1 8
PCICLK_F2 9
VDDPCI 10
GND 11
**MODE/PCICLK0 12
PCICLK1 13
PCICLK2 14
PCICLK3 15
PCICLK4 16
VDDPCI 17
GND 18
PCICLK5 19
PCICLK6 ²⁰
**FS3/48MHz 21
**Sel24_48#/24_48MHz 22
GND 23
VDD48 ²⁴
48 VDDA
47 GND
46 IREF
45 CPUCLKT_ITP/(PCI_STOP#)
44 CPUCLKC_ITP/(CPU_STOP#)
43 GND
42 CPUCLKT1
41 CPUCLKC1
40 _VDDCPU
39 CPUCLKT0
38 CPUCLKC0
37 GND
36 25Mhz_0
35 25Mhz_1
34 VDD2.5
33 VttPWR_GD/PD#
32 SDATA
31 SCLK
30 Reset#
29 _{3V66_0}
28 GND
27 VDD3V66
26 3V66_1
25 3V66_2
* This pin have 120K pull-up to VDD
** This pin have 120K pull-down to GND
48-pin SSOP & TSSOP