Komodo Fiber Reference Guide
33
Power Supply
The Komodo Fiber is power from the PCI express edge connector. The input voltages must be in
the range of ±8% of the nominal voltage. The DC voltage is stepped down to various power rails by
the board components. Please pay careful attention not to draw more than the maximum Wattage
from the power sources, as stated in the following table (see PCIe gen 3.0 specifications for more
information):
Power Source
Voltage [V]
Current [A]
Maximum Wattage[W]
25-W PCI Express edge connector
(when connected to PCIe gen 2.0 slot)
3.3
3.0
9
12.0
2.1
16
75-W PCI Express edge connector
(when connected to PCIe gen 3.0 slot)
3.3
3.0
9
12.0
5.5
66
Table 13: Power input
Maximum and minimum input voltages
The minimum and maximum input voltages that the Komodo Fiber can endure are based on PCIe
standard and shown in the table below.
Power Source [V]
Minimum Voltage [V]
Maximum Voltage [V]
3.3
3.04
3.56
12
11.04
12.96
Table 14: Maximum and minimum input voltages from PCIe
Power rails
The
Komodo Fiber converts the 12V and 3.3V inputs to several other voltages, as shown in the table
below.
Power Rail Name
Input
Voltage
[V]
Maximum
Current
[A]
FPGA
Other Component
-
VCC1, VCCTX, VCCRX (QSFP)
VCC_TX, VCC_RX (SFP+)
3.3
12
VCCPGM, VCCIO3A, VCCIO3B,
VCCPD3AB, VCCA_GXBL0,
VCCA_GXBL1, VCCA_GXBR0,
VCCA_GXBR1
-
3.0
3
VCCIO7A, VCCIO7B, VCCPD3CD,
VCCPD4, VCCPD7, VCCPD8,
VCCA_FPLL, VCC_AUX
-
2.5
3
VCCPT, VCCPGM, VCCH_GXBL0,
VCCH_GXBL1, VCCH_GXBR0,
VCCH_GXBR1, VCCD_FPLL
-
1.5
0.8
Electrical Characteristics
