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KC705 Evaluation Board
27
UG810 (v1.3) May 10, 2013
Feature Descriptions
User SMA Clock Input
[
, callout
]
An external high-precision clock signal can be provided to the FPGA bank 15 by
connecting differential clock signals through the onboard 50
Ω
SMA connectors J11 (P) and
J12 (N). The differential clock has signal names are USER_SMA_CLOCK_P and
USER_SMA_CLOCK_N, which are connected to FPGA U1 pins L25 and K25 respectively.
The user-provided 2.5 V differential clock circuit is shown in
.
GTX SMA Clock Input
[
, callout
The KC705 board includes a pair of SMA connectors for a GTX clock wired to GTX Quad
bank 117. This differential clock has signal names SMA_MGT_REFCLK_P and
SMA_REFCLK_N, which are connected to FPGA U1 pins J8 and J7 respectively.
shows this AC-coupled clock circuit.
•
External user-provided GTX reference clock on SMA input connectors
•
Differential Input
X-Ref Target - Figure 1-12
Figure 1-12:
User SMA Clock Source
USER_SMA_CLOCK_P
J12
USER_SMA_CLOCK_N
GND
J11
GND
UG810_c1_11_072111
SMA
Connector
SMA
Connector
X-Ref Target - Figure 1-13
Figure 1-13:
GTX SMA Clock Source
UG810_c1_12_072111
SMA_MGT_REFCLK_P
SMA_MGT_REFCLK_C_P
SMA
Connector
J16
GND
C11
0.01
μ
F 25V
X7R
SMA_MGT_REFCLK_N
SMA_MGT_REFCLK_C_N
SMA
Connector
J15
GND
C10
0.01
μ
F 25V
X7R