ICS951411 Datasheet, PDF (4/19 Pages) Integrated Circuit Systems – System Clock Chip for ATI RS400 P4TM-based Systems

Integrated
Circuit
Systems, Inc.
ICS951411
General Description
ICS951411 provides a single-chip clocking solution for the ATI RS400-based systems using the latest Intel P4 processors.
ICS951411 is driven with a 14.318MHz crystal. It generates CPU outputs up to 400MHz and also provides highly accurate
SRC clocks for PCI Express support. Two Clock Request pins are provided for Express-Card^TM support.
Block Diagram
X1
X2
XTAL
OSC.
FIXED PLL
DIVIDER
MAIN PLL
DIVIDERS
REF(2:0)
USB_48MHz
PCICLK0
ATIGCLK(1:0)
SRCCLK(7:3,0)
CPUCLK(2:0)
CK410#
FS(C:A)
CLKREQA#
CLKREQB#
CPU_STOP#
VTT_PWRGD#/PD
SDATA
SCLK
CONTROL
LOGIC
IREF
Power Groups
Pin Number
VDD
GND
56
55
51
49
45
44
14, 21, 35 15, 20, 26, 36
32
31
39
38
3
5
0891E—03/07/05
Description
Xtal, REF
PCICLK output
CPUCLK Outputs
SRCCLK outputs
ATIGCLK outputs
Analog, CPU PLL
USB_48MHz output
4