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Clock Generator for Serverworks Grand Champion Chipset Applications
CY28159
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Document #: 38-07118 Rev. **
Revised January 14, 2002
59
Features
• Eight differential CPU clock outputs
• One PCI output
• One 14.31818-MHz reference clock
• Two 48-MHz clocks
• All outputs compliant with Intel® specifications
• External resistor for current reference
• Selection logic for differential swing control, test mode,
Hi-Z, power-down and spread spectrum
• 48-pin SSOP and TSSOP packages
Intel is a registered trademark of Intel Corporation.
Table 1. Frequency Selection
SEL 100/133
S0
S1
CPU(0:7), CPU#(0:7)
3V33
48M(0,1)
Notes
0
0
0
100 MHz
33.3MHz
48 MHz
Normal Operation
0
0
1
100 MHz
33.3MHz
Disable
Test Mode(recommended)
0
1
0
100 MHz
Disable
Disable
Test Mode (optional)
0
1
1
Hi-Z
Hi-Z
Hi-Z
Hi-Z all outputs
1
0
0
133.3MHz
33.3MHz
48 MHz
Optional
1
0
1
133.3MHz
33.3MHz
Disable
Optional
1
1
0
200MHz
33.3MHz
48 MHz
o7ptional
1
1
1
N/A
N/A
N/A
Reserved
Block Diagram
Pin Configuration
OSC
VCO
I
Control
VDDI
I_Ref
VSSI
REF
CPU (0:7)
CPU (0:7)#
48M(0,1)/S(0,1)
VDDL
3V33
VSSL
SSCG#
SEL100/133
XOUT
XIN
MultSel(0:1)
PD#
S(0,1)
3V33
VDD
48M0/S0
48M1/S1
VSS
VDD
CPU0
CPU0#
VSS
CPU1
CPU1#
VDD
CPU2
CPU2#
VSS
CPU3
CPU3#
VDD
REF
SSCG#
VSS
XIN
XOUT
VDD
SEL100/133
VSS
VDDA
VSSA
PD#
VDD
CPU4
CPU4#
VSS
CPU5
CPU5#
VDD
CPU6
CPU6#
VSS
CPU7
CPU7#
VDD
MULT0
MULT1
VSS
VSSA
IREF
VDDA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
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