4.15 JTAG Emulation
The following sequence should be followed for proper functioning of JTAG:
1. Power the board by connecting the Type-C USB connector with 5 V at 3A.
2. Connect the micro-B USB cable for JTAG emulation into J20 once after powering the board (Hot Plug).
The AM243x LaunchPad includes the necessary circuitry for XDS110 emulation. The XDS110 class on-board
emulation is used to support testing of software builds. The connection for the emulator uses a USB 2.0 micro-B
connection (J20) and the circuit acts as a powered USB peripheral device. The VBUS power from the connector
is used to power the emulation circuit such that the connection to the emulator is not lost when power to the
LaunchPad is removed. Voltage translation buffers are used to isolate the XDS110 circuit from the rest of the
LaunchPad.
An ESD protection diode (TPDE02B04DQAR) is provided on the USB signals to steer ESD current pulses to
VCC or GND. The ESD protection diode protects against ESD pulses up to ±2.5 kV Human-Body Model (HBM)
as specified in ANSI/ESDA/JEDEC JS-001 and provides ±12 kV contact discharge as well as ±15 kV air-gap
discharge as specified in IEC 61000-4-2.
Figure 4-26. JTAG Interface
Figure 4-27. Micro-B USB Connection for JTAG
Hardware Description
SPRUJ12B – AUGUST 2021 – REVISED OCTOBER 2022
AM243x LaunchPad™ Development Kit User's Guide
43
Copyright © 2022 Texas Instruments Incorporated
