Xilinx KCU116 - FMC Connector JTAG Bypass

KCU116 Board User Guide 27
UG1239 (v1.2) September 28, 2018 www.xilinx.com
Chapter3: Board Component Descriptions
FMC Connector JTAG Bypass
When an FMC is attached to the KCU116 board, it is automatically added to the JTAG chain
through an 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 the FMC is
attached to J5. Switch U27 adds an attached HPC FMC to the FPGAs JTAG chain as
determined by the FMC_HSPC0_PRSNT_M2C_B signal. The attached FMC card must
implement a TDI-to-TDO connection through a device or bypass jumper to ensure that the
JTAG chain connects to the FPGA U1.
X-Ref Target - Figure 3-5
Figure3‐5: JTAG Chain Block Diagram
System
Ctlr.
(U161)
TDO
TCK
TMS
TDI
Digilent
USB
Module
(U21)
TCK
TMS
TDI
TDO
JTAG
Con
(J8)
TDO
TDI
TMS
TDK
FPGA
TCK
TMS
TDI
TDO
U1
1.8V 3.3V
To FMC HPC0 J5
Level-shifted to 3.3V
U48
1.8V 3.3V
U11
FMC
HPC0
Connector
J5
N.C.
SPST Bus Switch
U27
Level-shifted to 1.8V
3.3V 1.8V
U48
Level-shifted to 3.3V
TDO TDI
VREF = 1.8V
X18421-042618
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