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Appendix F Reference Charts
These reference charts contain detailed information about generated frequencies, connector pinouts
and jumper pinouts for the ATTO FastStream SC RAID storage controllers.
Generated frequencies
Connector pinouts
Description
Frequency
Origin
Type
Level
DDR2 SDRAM
266.67MHz
U23
Derived
SSTL1.8
SAS Reference Clock
125MHz
U39
Oscillator LVPECL
EPLD Clock
66.67MHz
U33
Oscillator TTL/CMOS
SAS Multiplexer Clock
33.33MHz
U27
Derived
TTL/CMOS
Ethernet Mac PCI
66.67MHz
U23
Derived
TTL/CMOS
Ethernet Phy Clock
25MHz
Y1
Crystal
-
PCI Express Clock Generator
25MHz
Y3
Crystal
-
PCI Express Reference Clock
100MHz
U34
Oscillator LVPECL
Fibre Channel Controller PCI-E
133.33MHz
HBA(U6)
Derived
TTL/CMOS
Fibre Channel Reference Clock
106.25MHz
HBA(U7, U15) Oscillator LVPECL
SAS HBA Reference Clock
150MHz
HBA(U19)
Oscillator LVPECL
HBA Bridge Configuration
3.686MHz
HBA(Y1)
Crystal
-
Table 1 Data rate in cables
Cable
Date Rate
Optical Fibre Channel
8 Gb (4 GHz fundamental clock)
SAS Device Cables
6 Gb (3 GHz fundamental clock)
1000/100/10 Mb Ethernet 125 MHz
Table 2 ATX 24-pin power connector pinouts (J1)
Pin Voltage/Signal
1
VDD3.3
2
VDD3.3
3
Ground
4
VDD5V
5
Ground
6
VDD5V
7
Ground
8
ATX_POWER_OK
9
5VSB
10
VDD12.0
11
VDD12.0
12
VDD3.3