Fmc Connector Jtag Bypass - Xilinx KCU116 User Manual

X-Ref Target - Figure 3-5
System
Ctlr.
TDO
(U161)
TCK
TMS
TDI
Digilent
USB
TCK
Module
(U21)
TMS
TDI
TDO
JTAG
TDO
Con
(J8) TDI
TMS
TDK
VREF = 1.8V

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.
KCU116 Board User Guide
UG1239 (v1.2) September 28, 2018
1.8V 3.3V
U48
SPST Bus Switch
U27
J5
Connector
Level-shifted to 1.8V
1.8V 3.3V
TDO
U11
Figure 3‐5: JTAG Chain Block Diagram
www.xilinx.com
Chapter 3: Board Component Descriptions
Level-shifted to 3.3V
To FMC HPC0 J5
TCK
TMS
TDI
N.C.
FMC
HPC0
Level-shifted to 3.3V
3.3V 1.8V
TDI
U48
U1
FPGA
TDO
X18421-042618
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