
Komodo CXP Reference Guide
14
Clocking
The
Komodo CXP
has a variety of on board oscillators, as described in the table and figure below:
cxp_clkp/n
7A
7B
7C
7D
8E
8D
8C
8B
8A
4A
4B
4C
4E
3E
3C
3B
3A
B2L
B0L
B1L
B2R
B0R
B1R
25 MHz
Oscillator
clk25[1]
7E
3D
4D
25 MHz
Oscillator
clk25[0]
125 MHz
Oscillator
100 MHz
From PCIe edge
connector
pcie_refclk_p/n
Figure 5: Clocks pin assignments, signal name and functions
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
Table 2: Clocks pin assignments, signal name and functions
Board Components