ADM-XRC-9R1 User Manual
V1.7 - 16th Sept 2020
3.3 JTAG Interface
3.3.1 On-board Interface
A JTAG boundary scan chain is connected to header U12. This allows the connection of the Xilinx JTAG cable for
FPGA debug using the Xilinx ChipScope tools.
:
Target FPGA
XCZU27DR
FFVE1156
CPLD
XC2C64A
CPG56
VREF (3.3V)
HDR_TDI
HDR_TDO
Buffer
3.3V
En#
XMC
Con
(Pn5)
Header
U12
XMC_TDI
XMC_TDO
XMC_JTAG_EN#
SW1-6
Figure 3 : JTAG Boundary Scan Chain
If the boundary scan chain is connected to the interface at the XMC connector (SW1-X is ON), Header U12
should not be used.
3.3.2 XMC Interface
The JTAG interface on the XMC connector is normally unused and XMC_TDI connected directly to XMC_TDO.
The interface can be connected to the on-board interface (through level-translators) by switching SW1-X ON.
See
3.3.3 JTAG Voltages
The on-board JTAG scan chain uses 3.3V. The Vcc supply provided on U12 to the JTAG cable is +3.3V and is
protected by a poly fuse rated at 350mA.
The JTAG signals at the XMC interface use 3.3V signals and are connected through level translators to the
on-board scan chain.
Page 9
Functional Description
ad-ug-1353_v1_7.pdf