Xilinx ZC702 User Manual

ZC702 Board User Guide www.xilinx.com 29
UG850 (v1.7) March 27, 2019
Feature Descriptions
DIP switch SW10[1:2] setting 10 selects the 14-pin header J2 for configuration using either
a Parallel Cable IV (PC4) or Platform Cable USB II. DIP switch SW10 setting 01 selects the
USB-to-JTAG Digilent bridge U23 for configuration over a Standard-A to Micro-B USB cable.
DIP switch SW10 setting 11 selects the JTAG 20-pin header at J58. The four JTAG signals TDI,
TDO, TCK, and TMS would be connected to J58 through flying leads from a JTAG cable. The
3-to-1 analog switch settings are shown in Table 1-10.
FMC Connector JTAG Bypass
When an FPGA mezzanine card (FMC) is attached to J3 or J4 it is automatically added to the
JTAG chain through electronically controlled single-pole single-throw (SPST) switches U25
and U26. The SPST switches are normally closed and transition to an open state when an
FMC is attached. Switch U25 adds an attached FMC to the JTAG chain as determined by the
FMC1_HPC_PRSNT_M2C_B signal. Switch U26 adds an attached FMC to the JTAG chain as
determined by the FMC2_LPC_PRSNT_M2C_B signal The attached FMC card must
implement a TDI-to-TDO connection using a device or bypass jumper to ensure that the
JTAG chain connects to the XC7Z020 SoC.
Clock Generation
The ZC702 board provides three clock sources for the XC7Z020 SoC. Table 1-11 lists the
source devices for each clock.
Table 1-10: Switch SW10 JTAG Configuration Option Settings
Configuration Source
DIP Switch SW10[1:2]
Switch 1
(1)
JTAG_SEL_1 Switch 2
(1)
JTAG_SEL_2
None
00
Digilent USB-to-JTAG interface U23
01
Cable connector J2
(2)
10
JTAG header J58
11
Notes:
1. 0 = open, 1 = closed
2. Default switch setting
Table 1-11: ZC702 Board Clock Sources
Clock Name
Clock
Source
Description
System Clock U43
SiT9102 2.5V LVDS 200
MHz fixed-frequency oscillator (SiTime). See System
Clock.
User Clock U28
Si570 3.3V LVDS I2C programmable oscillator, 156.250
MHz default (Silicon
Labs). See Programmable User Clock.
PS Clock U65
SIT8103 1.8V single-ended CMOS 33.3333
MHz fixed frequency oscillator
(SiTime). See Processing System Clock Source.
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Xilinx ZC702 Specifications

General

Brand	Xilinx
Model	ZC702
Category	Motherboard
Language	English