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AC701 Evaluation Board www.xilinx.com 21
UG952 (v1.1) January 30, 2013
Feature Descriptions
Clock Generation
There are three clock sources available for the FPGA fabric on the AC701 board (refer to
Table 1-8).
X-Ref Target - Figure 1-9
Figure 1-9: JTAG Circuit
UG952_c1_09_101512
JTAG_TDI
FMC_TDI_BUF
FPGA_TDO
FPGA_TMS_BUF
FPGA_TCK_BUF
FPGA_TDI_BUF
FMC1_TDO_FPGA_TDI
FMC1_HPC_TMS_BUF
FMC1_HPC_PRSNT_M2C_B
JTAG_TMS
JTAG_TCK
JTAG_TDO
FMC1_HPC_TCK_BUF
FMC1 HPC
Connector
TDI
TDO
J30
TMS
TCK
PRSNT_L
VCC3V3
Artix-7
FPGA
TDI
N16
TDO
U1
TMS
TCK
Digilent
USB-JTAG
Module
TMS
TDI
SN74LV541A
Buffer
U19
R95 15Ω
U26
R96 15Ω
R94 15Ω
TCK
TDO
TMS
TDI
J4
TCK
TDO
JTAG
Header
VCC3V3
VCC3V3
U27
Bank 0
Bank 14
Table 1-8: AC701 Board Clock Sources
Clock Name Reference Description
System Clock
U51
SiT9102 2.5V LVDS 200 MHz Fixed Frequency
Oscillator (Si Time). See System Clock Source, page 22.
User Clock
U34
Si570 3.3V LVDS I
2
C Programmable Oscillator
(Silicon Labs). Default power-on frequency 156.250
MHz. See Programmable User Clock Source, page 23.
User SMA Clock
(differential pair)
J31
USER_SMA_CLOCK_P (net name).
See User SMA Clock Input, page 24.
J32
USER_SMA_CLOCK_N (net name)
See User SMA Clock Input, page 24
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