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| 型号： | W195 |
| 英文描述： | Clocks and Buffers |
| 中文描述： | 时钟和缓冲器 |
| 文件页数： | 1/14页 |
| 文件大小： | 142K |
| 代理商： | W195 |
PRELIMINARY
Frequency Generator for Integrated Core Logic
W195B
Cypress Semiconductor Corporation
Document #: 38-07160 Rev. *A
3901 North First Street
San Jose
CA 95134
408-943-2600
Revised December 14, 02
Features
Maximized EMI suppression using Cypress’s Spread
Spectrum Technology
Low jitter and tightly controlled clock skew
Highly integrated device providing clocks required for
CPU, core logic, and SDRAM
Two copies of CPU clocks
Nine copies of SDRAM clocks
Eight copies of PCI clock
One copy of synchronous APIC clock
Two copies of 66-MHz outputs
Two copies of 48-MHz outputs
One copy of selectable 24- or 48-MHz clock
One copy of double strength 14.31818-MHz reference
clock
Power-down control
I
2
C interface for turning off unused clocks
Key Specifications
CPU, SDRAM Outputs Cycle-to-Cycle Jitter: ............. 250 ps
APIC, 48 MHz, 3V66, PCI Outputs
Cycle-to-Cycle Jitter: .................................................. 500 ps
CPU, 3V66 Output Skew: .......................................... 175 ps
SDRAM, APIC, 48MHz Output Skew: ........................250 ps
PCI Output Skew:........................................................500 ps
CPU to SDRAM Skew (@100 MHz):..................4.5 to 5.5 ns
CPU to 3V66 Skew (@ 66 MHz): .......................7.0 to 8.0 ns
3V66 to PCI Skew (3V66 lead):..........................1.5 to 3.5 ns
PCI to APIC Skew: ....................................................
± 0.5 ns
Table 1. Frequency Selections
FS3 FS2 FS1 FS0
CPU
1
1
1
1
133.6
1
1
1
0
1
1
0
1
100.2
1
1
0
0
66.8
1
0
1
1
105
1
0
1
0
110
1
0
0
1
114
1
0
0
0
119
0
1
1
1
124
0
1
1
0
129
0
1
0
1
95
0
1
0
0
138
0
0
1
1
150
0
0
1
0
75
0
0
0
1
90
0
0
0
0
83.3
SDRAM 3V66
133.6
Reserved
100.2
100.2
105
110
114
119
124
129
95
138
150
113
90
125
PCI
33.4
APIC
16.7
66.8
66.8
66.8
70
73.3
76
79.3
82.7
64.5
63.3
69
75
75
60
83.3
33.4
33.4
35
36.7
38
39.7
41.3
32.3
31.7
34.5
37.5
37.5
30
41.7
16.7
16.7
17.5
18.3
19
19.8
20.7
16.1
15.8
17.3
18.8
18.8
15
20.8
Block Diagram
Pin Configuration
VDDQ3
VDDQ2
PCI1/FS1*
PCI2/FS2*
XTAL
OSC
PLL REF FREQ
PLL 1
X2
X1
REF2X/FS3*
PCI3:7
48MHz_0:1
SI0/24_48#MHz*
PLL2
VDDQ3
I
2
C
Logic
SDATA
SCLK
3V66_0:1
PCI0/FS0*
CPU0:1
APIC
Divider,
Delay,
and
Phase
Control
Logic
2
VDDQ3
2
SDRAM0:8
9
PWRDWN#
/2
FS3*
FS2*
FS1*
FS0*
5
2
REF2x/FS3*
VDDQ3
X1
X2
GND
VDDQ3
3V66_0
3V66_1
GND
FS0*/PCI0
FS1^/PCI1
FS2*/PCI2
GND
PCI3
PCI4
VDDQ3
PCI5
PCI6
PCI7
GND
48MHz_0
48MHz_1
SI0/24_48#MHz*
VDDQ3
W
VDDQ2
APIC
VDDQ2
CPU0
CPU1
GND
VDDQ3
SDRAM0
SDRAM1
SDRAM2
GND
SDRAM3
SDRAM4
SDRAM5
VDDQ3
SDRAM6
SDRAM7
SDRAM8
GND
PWRDWN#*
SCLK
VDDQ3
GND
SDATA
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
Note:
1.
Internal 250K pull-up or pull down resistors present on inputs
marked with * or ^ respectively. Design should not rely solely on
internal pull-up or pull down resistor to set I/O pins HIGH or LOW
respectively.
[1]
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