W311 Datasheet, PDF (1/19 Pages) Silicon Laboratories – FTG for VIA™ Pro-266 DDR Chipset

1W311
W311
FTG for VIA Pro-266 DDR Chipset
Features
• Maximized EMI Suppression using Cypress’s Spread
Spectrum Technology
• System frequency synthesizer for VIA Pro-2000
• Programmable clock output frequency with less than
1 MHz increment
• Integrated fail-safe Watchdog Timer for system
recovery
• Automatically switch to HW selected or SW
programmed clock frequency when Watchdog Timer
time-out
• Capable of generate system RESET after a Watchdog
Timer time-out occurs or a change in output frequency
via SMBus interface
• Support SMBus byte read/write and block read/ write
operations to simplify system BIOS development
• Vendor ID and Revision ID support
• Programmable drive strength for CPU and PCI output
clocks
• Programmable output skew between CPU, AGP and PCI
• Supports Intel® Celeron® and Pentium® III class pro-
cessor
• Three copies of CPU output
• Nine copies of PCI output
• One 48-MHz output for USB
• One 24-MHz or 48-MHz output for SIO
• Two buffered reference outputs
• Three copies of APIC output
• Supports frequencies up to 200 MHz
• SMBus interface for programming
• Power management control inputs
• Available in 48-pin SSOP
Key Specifications
CPU Cycle-to-Cycle Jitter:...........................................250 ps
CPU to CPU Output Skew:..........................................175 ps
PCI Cycle to Cycle Jitter:.............................................500 ps
PCI to PCI Output Skew: .............................................500 ps
Block Diagram
X1
X2
CPU_STOP#
PWR_DWN#
FS0:1
X TA L
OSC
DIV
PLL Ref Freq
DIV
PLL 1
Stop
Clock
Control
÷6, ÷8,
÷10, ÷12
PCI_STOP#
SD ATA
SCLK
SMBus
Logic
Stop
Clock
Control
VDD_REF
REF0
R E F 1 /F S 4
V D D _ A P IC
A P IC 0 :1
VDD_AGP
A G P 0:2
VDD_CPU
C P U 1 :3
VDD_PCI
P C I_ F
P C I1 :8
RST#
VDD_48 MHz
Pin Configuration^[1]
VDD_REF 1
GND_REF 2
X1 3
X2 4
VDD_48 MHz 5
FS3*/48 MHz 6
FS2*/24_48 MHz 7
GND_48 MHz 8
PCI_F 9
PCI1 10
PCI2 11
GND_PCI 12
PCI3 13
PCI4 14
VDD_PCI 15
PCI5 16
PCI6 17
PCI7 18
GND_PCI 19
PCI8 20
*FS1 21
*FS0 22
AGP0 23
VDD_AGP 24
48 REF0
47 REF1/FS4*
46 VDD_APIC
45 APIC0
44 APIC1
43 GND_APIC
42 APIC2
41 VDD_CPU
40 GND_CPU
39 CPU1
38 CPU2
37 VDD_CPU
36 GND_CPU
35 CPU3
34 CPU_STOP#*
33 PCI_STOP#*
32 RST#
31 VDD_CORE
30 GND_CORE
29 SDATA
28 SCLK
27 AGP2
26 AGP1
25 GND_AGP
PLL2
4 8 M H z/F S 3
÷2
Note:
1. Signals marked with ‘*’ have internal pull-up resistors.
2 4 _ 4 8 M H z/F S 2
Intel, Pentium, and Celeron are registered trademarks of Intel Corporation.
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
July 3, 2003