3.5.1 JTAG on Module Connector
The PL and the PS JTAG interfaces are connected into one single chain available on the module connector.
The PS_JTAG pins are used by the Zynq Ultrascale+ TAP controller - the controller has full functionality only
after the PS boot is complete. In order to enable the ARM DAP controller, special commands must be sent
to the Zynq Ultrascale+ TAP.
The MPSoC device and the flash devices can be configured via JTAG from Xilinx SDK or Xilinx Vivado Hard-
ware Manager - for this operation, the ARM DAP must be enabled.
Signal Name Module Connector Pin PS Dedicated Pin Resistor
JTAG_TCK A-123 PS_JTAG_TCK 10 kΩ pull-up to VCC_CFG_MIO
JTAG_TMS A-119 PS_JTAG_TMS 10 kΩ pull-up to VCC_CFG_MIO
JTAG_TDI A-117 PS_JTAG_TDI 10 kΩ pull-up to VCC_CFG_MIO
JTAG_TDO A-121 PS_JTAG_TDO 10 kΩ pull-up to VCC_CFG_MIO
Table 38: JTAG Interface - PL and PS Access and Debug
3.5.2 External Connectivity
JTAG signals can be connected directly on the base board to a JTAG connector. No pull-up/pull-down re-
sistors are necessary. The VREF pin of the programmer must be connected to VCC_CFG_MIO.
It is recommended to add 22 Ω series termination resistors between the module and the JTAG header, close
to the source. Please refer to the Enclustra Module Pin Connection Guidelines for details on JTAG interface.
3.6 eMMC Boot Mode
In the eMMC boot mode, the PS boots from the eMMC flash located on the module. The flash device is
connected to the PS MIO pins 13-22 for 8-bit data transfer mode.
3.7 QSPI Boot Mode
In the QSPI boot mode, the PS boots from the QSPI flash located on the module. The flash device is
connected to the PS MIO pins 0-5.
3.8 SD Card Boot Mode
In the SD card boot mode the PS boots from the SD card located on the base board. There are two SD
card boot modes available on the Mercury XU5 SoC module. Please note that the SD boot mode with level
shifter is currently not supported.
The SD boot mode with level shifter is used with Ultra High Speed (UHS) SD cards. The controller will start
the communication at 3.3 V and afterwards it will command the card to drop from 3.3 V operation to 1.8
V operation. For this mode, an external SD 3.0 compliant level shifter is required. This boot mode may be
supported in the future by Enclustra modules and base boards.
D-0000-445-001 52 / 64 Version 07, 25.07.2019
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