Xilinx KC705 User Manual

KC705 Evaluation Board 26
UG810 (v1.8) March 20, 2018 www.xilinx.com
Chapter 1: KC705 Evaluation Board Features
USB JTAG Module
[Figure 1-2, callout 6]
JTAG configuration is provided through a Digilent onboard USB-to-JTAG configuration
logic module (U59) where a host computer accesses the KC705 board JTAG chain through a
standard-A plug (host side) to micro-B plug (KC705 board side) USB cable.
A 2-mm JTAG header (J60) is also provided in parallel for access by Xilinx® download cables
such as the Platform Cable USB II and the Parallel Cable IV.
The JTAG chain of the KC705 board is illustrated in Figure 1-8. JTAG configuration is allowed
at any time regardless of FPGA mode pin settings. JTAG initiated configuration takes
priority over the configuration method selected through the FPGA mode pin settings at
SW13.
When an FMC card is attached to the KC705 board, it is automatically added to the JTAG
chain through electronically controlled single-pole single-throw (SPST) switches U76 and
U77. The SPST switches are in a normally closed state and transition to an open state when
an FMC mezzanine card is attached. Switch U76 adds an attached FMC HPC mezzanine card
to the FPGAs JTAG chain as determined by the FMC_HPC_PRSNT_M2C_B signal. Switch U77
adds an attached FMC HPC mezzanine card to the FPGAs JTAG chain as determined by the
FMC_LPC_PRSNT_M2C_B signal. The attached FMC card must implement a TDI-to-TDO
connection via a device or bypass jumper for the JTAG chain to be completed to the FPGA
U1.
The JTAG connectivity on the KC705 board allows a host computer to download bitstreams
to the FPGA using the Xilinx software. In addition, the JTAG connector allows debug tools or
a software debugger to access the FPGA. The Xilinx software tool can also indirectly
program the Linear BPI or the Quad SPI flash memory. To accomplish this, the software
X-Ref Target - Fig ure 1-8
Figure 1-8: JTAG Chain Block Diagram
UG810_c1_08_031214
2.5V3.3V
FMC HPC
Connector
TDI
TDO
J22
USB
Module
or
JTAG
Connector
(J60)
TDO
TDI
U1
Kintex-7
FPGA
TDI
TDO
SN74AVC1T45
Voltage
Translator
TDI TDO
U102
FMC LPC
Connector
TDI
TDO
J2
SPST Bus Switch
U76
N.C. N.C.
SPST Bus Switch
U77
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Xilinx KC705 Specifications

General

Brand	Xilinx
Model	KC705
Category	Motherboard
Language	English