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參數資料
| 型號： | W312-02HT |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | FTG for VIA K7 Series Chipset with Programmable Output Frequency |
| 中文描述： | 200 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | SSOP-48 |
| 文件頁數： | 1/21頁 |
| 文件大?。?/td> | 143K |
| 代理商： | W312-02HT |
FTG for VIA K7 Series Chipset with Programmable Output Frequency
W312-02
Cypress Semiconductor Corporation
Document #: 38-07259 Rev. *B
3901 North First Street
San Jose
CA 95134
Revised December 19, 2002
408-943-2600
Features
Single chip FTG solution for VIA K7 Series chipsets
Programmable clock output frequency with less than
1 MHz increment
Integrated fail-safe Watchdog timer for system recov-
ery
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 PCI output clocks
Programmable output skew between CPU, AGP and PCI
Maximized EMI suppression using Cypress’s Spread
Spectrum technology
Low jitter and tightly controlled clock skew
Two pairs of differential CPU clocks
Eleven copies of PCI clocks
Three copies of 66-MHz outputs
Two copies of 48-MHz outputs
Three copies of 14.31818-MHz reference clocks
One RESET output for system recovery
Power management control support
Key Specifications
CPU Outputs Cycle-to-cycle Jitter: .............................250 ps
48-MHz, 3V66, PCI Outputs
Cycle-to-cycle Jitter:....................................................500 ps
CPU, 3V66 Output Skew:............................................200 ps
48-MHz Output Skew: .................................................250 ps
PCI Output Skew:........................................................500 ps
Block Diagram
Pin Configuration
Note:
1.
Internal 100K pull-up resistors present on inputs marked with *. De-
sign should not rely solely on internal pull-up resistor to set I/O pins
HIGH.
[1]
VDD_REF
VDD_CPU
PCI1:8
XTAL
OSC
PLL REF FREQ
PLL 1
X2
X1
REF2
REF1/FS1*
REF0/FS0*
24_48MHz/FS4*
PLL2
VDD_48MHz
SMBus
Logic
SDATA
SCLK
AGP0:2
CPUT0,CPUC0
CPUT_CS,CPUC_CS
VDD_AGP
Divider,
Delay,
and
Phase
Control
Logic
3
VDD_PCI
PCI0/SEL24_48#*
2
RST#
PCI9_E
/2
(FS0:4)
5
48MHz/FS3*
VDD_REF
GND_REF
X1
X2
VDD_48MHz
*FS2/48MHz
*FS3/24_48MHz
GND_48MHz
*FS4/PCI_F
*SEL24_48#/PCI0
PCI1
GND_PCI
PCI2
PCI3
VDD_PCI
PCI4
PCI5
PCI6
GND_PCI
PCI7
PCI8
PCI9_E
VDD_PCI
RST#
W
REF0/FS0*
REF1/FS1*
REF2
REF_STOP#*
AGP_STOP#*
GND_CPU
CPUT0
CPUC0
VDD_CPU
CPUT_CS
CPUC_CS
GND_CPU
CPU_STOP#*
PCI_STOP#*
PD#*
VDD_CORE
GND_CORE
SDATA
SCLK
GND_AGP
AGP2
AGP1
AGP0
VDD_AGP
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SEL24_48#*
PD#
CPU_STOP#
PCI_STOP#
AGP_STOP#
REF_STOP#
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