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24
KC705 Evaluation Board
UG810 (v1.3) May 10, 2013
Chapter 1:
KC705 Evaluation Board Features
lists the pin-to-pin connections from each clock source to the FPGA.
System Clock Source
[
, callout
]
The KC705 board has a 2.5V LVDS differential 200 MHz oscillator (U6) soldered onto the
back side of the board and wired to an FPGA MRCC clock input on bank 33. This 200 MHz
signal pair is named SYSCLK_P and SYSCLK_N, which are connected to FPGA U1 pins
AD12 and AD11 respectively.
•
Oscillator: Si Time SiT9102AI-243N25E200.00000 (200 MHz)
•
PPM frequency jitter: 50 ppm
•
Differential Output
The system clock circuit is shown in
.
User SMA Clock
(differential pair)
J11
USER_SMA_CLOCK_P (net name).
See
J12
USER_SMA_CLOCK_N (net name)
See
GTX SMA REF Clock
(differential pair)
J16
SMA_MGT_REFCLK_P (net name).
See
.
J15
SMA_MGT_REFCLK_N (net name).
See
.
Jitter Attenuated Clock
U70
Si5324C LVDS precision clock multiplier/jitter
attenuator (Silicon Labs).
See
Jitter Attenuated Clock, page 28
Table 1-9:
Source to FPGA Clock Connections
Clock Source Pin
Net Name
FPGA (U1) Pin
U6.5
SYSCLK_N
AD11
U6.4
SYSCLK_P
AD12
U45.5
USER_CLOCK_N
K29
U45.4
USER_CLOCK_P
K28
J12.1
USER_SMA_CLOCK_N
K25
J11.1
USER_SMA_CLOCK_P
L25
J15.1
SMA_MGT_REFCLK_N
J7
J16.1
SMA_MGT_REFCLK_P
J8
U70.29
Si5326_OUT_N
L7
U70.28
Si5326_OUT_P
L8
Table 1-8:
KC705 Board Clock Sources
(Cont’d)
Clock Name
Reference
Description