Usb Jtag Module - Xilinx AC701 User Manual

USB JTAG Module

[Figure
JTAG configuration is provided through a Digilent onboard USB-to-JTAG configuration logic
module (U26) where a host computer accesses the AC701 board JTAG chain through a standard-A
plug (host side) to micro-B plug (AC701 board side) USB cable.
A 2-mm JTAG header (J4) 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 AC701 board is illustrated in
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 SW1.
X-Ref Target - Figure 1-8
USB
Module
(U26)
or
JTAG
Connector
(J4)
TDO
TDI
When an FMC card is attached to the AC701 board, it is automatically added to the JTAG chain
through electronically controlled single-pole single-throw (SPST) switch U27. The SPST switch is
in a normally closed state and transitions to an open state when an FMC card is attached. Switch
U27 adds an attached FMC HPC mezzanine card to the FPGAs JTAG chain as determined by the
FMC_HPC_PRSNT_M2C_B signal. The attached FMC card must implement a TDI-to-TDO
connection through a device or bypass jumper in order for the JTAG chain to be completed to the
FPGA U1.
AC701 Evaluation Board
UG952 (v1.4) August 6, 2019
1-2, callout 5]
SPST Bus Switch
U27
J30
FMC HPC
Connector
Part of U19
BUFFER TDI TDO
Figure 1-8: JTAG Chain Block Diagram
www.xilinx.com
Figure 1-8. JTAG configuration is allowed at
N.C.
Part of U19
BUFFER
Feature Descriptions
U1
FPGA
TDI
TDO
UG952_c1_08_012913
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