ICS954119 Datasheet, PDF (3/17 Pages) Integrated Circuit Systems – Programmable Timing Control Hub™ for Next Gen P4™ processor

Integrated
Circuit
Systems, Inc.
Pin Description
PIN # PIN NAME
29 GND
30 PCIEXC3
31 PCIEXT3
32 PCIEXC4
33 PCIEXT4
34 VDDPCIEX
35 VDDA
36 GNDA
37 IREF
38 GND
39 CPUCLKC1
40 CPUCLKT1
41 VDDCPU
42 CPUCLKC0
43 CPUCLKT0
44 SDATA
45 SCLK
46 VDDREF
47 X2
48 X1
49 GND
50 REF1
51 REF0/FSLC
52 Reset#
53 PCICLK0
54 PCICLK1
55 PCICLK2
56 VDDPCI
ICS954119
Advance Information
TYPE DESCRIPTION
PWR
OUT
OUT
OUT
OUT
PWR
Ground pin.
Complement clock of differential PCI_Express pair.
True clock of differential PCI_Express pair.
Complement clock of differential PCI_Express pair.
True clock of differential PCI_Express pair.
Power supply for PCI Express clocks, nominal 3.3V
PWR 3.3V power for the PLL core.
PWR Ground pin for the PLL core.
OUT
PWR
OUT
OUT
PWR
OUT
OUT
I/O
IN
PWR
OUT
IN
PWR
OUT
I/O
OUT
OUT
OUT
OUT
PWR
This pin establishes the reference current for the differential current-mode
output pairs. This pin requires a fixed precision resistor tied to ground in
order to establish the appropriate current. 475 ohms is the standard value.
Ground pin.
Complimentary clock of differential pair CPU outputs. These are current
mode outputs. External resistors are required for voltage bias.
True clock of differential pair CPU outputs. These are current mode
outputs. External resistors are required for voltage bias.
Supply for CPU clocks, 3.3V nominal
Complimentary clock of differential pair CPU outputs. These are current
mode outputs. External resistors are required for voltage bias.
True clock of differential pair CPU outputs. These are current mode
outputs. External resistors are required for voltage bias.
Data pin for SMBus circuitry, 5V tolerant.
Clock pin of SMBus circuitry, 5V tolerant.
Ref, XTAL power supply, nominal 3.3V
Crystal output, Nominally 14.318MHz
Crystal input, Nominally 14.318MHz.
Ground pin.
14.318 MHz reference clock.
14.318 MHz reference clock./ 3.3V tolerant input for CPU frequency
selection. Refer to input electrical characteristics for Vil_FS and Vih_FS
values.
Real time system reset signal for frequency gear ratio change or watchdog
timer timeout. This signal is active low.
PCI clock output.
PCI clock output.
PCI clock output.
Power supply for PCI clocks, nominal 3.3V
0875—05/24/04
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