Komodo Fiber Reference Guide
15
Board
reference
Signal Name
Arria V
GZ Pin
Number
Arria V
GZ Clock
Name
I/O
Standard
Description
U2
cxp_clkp
W6
REFCLK0Rp
LVDS
125 MHz oscillator for
transceiver reference clock
cxp_clkn
W5
REFCLK0Rn
U29
clk25[0]
AE16
CLK7p
SSTL-135
25 MHz oscillators for DDR3
memory
U33
clk25[1]
J19
CLK19p
J17
pcie_refclk_p
U28
REFCLK1Lp
HCSL
100 MHz clock coming from
the PCI express edge connector
pcie_refclk_n
U29
REFCLK1Ln
U51
eth_clkp
R6
REFCLK2Rp
LVDS
322.265625 MHz oscillator for
transceiver reference clock
eth_clkn
R5
REFCLK2Rn
U52
eth_opt_clkp
U7
REFCLK1Lp
LVDS
Optional 322.265625 MHz
oscillators for transceiver
reference clock
eth_opt_clkn
U6
REFCLK1Ln
Table 2: Clocks pin assignments, signal name and functions
I/O and Transceivers
The Komodo Fiber utilizes several I/O banks out of the possible 26 I\O or transceiver banks
available on the Arria V GZ FPGA. The following figure describes what each bank is used for:
7A
7B
7C
7D
7E
8E
8D
8C
8B
8A
4A
4B
4C
4E
4D
3D
3E
3C
3B
3A
B2R
B0R
B1R
B2L
B0L
B1L
Rx
Tx
QSFP
transceirers
transceirers
SFP+
PCIe_Tx
PCIe_Rx
DDR3 SDRAM + SFP and QSFP I/O + GPIO
DDR3 SODIMM
Rx
Tx
Figure 5: I/O and transceiver usage
Board Components