3.6 JTAG Emulation
The Common processor board includes XDS110 class on board emulation through the micro B connector J3. It
also has an option to support external emulation through MIPI 60 pin header (J16). When an external emulator is
connected, XDS110 emulation circuitry path will be disconnected automatically.
MUX
2:1
(x2)
R
A
S
B2
B1
JTAG_MUX_SEL
VCC_3V3_XDS
SOC_TDI,
SOC_TMS
SOC_TMK,
SOC_TRST#,
SOC_TDO
SOC_EMU0
SOC_EMU1
EXT_MIPI_TDI,
EXT_MIPI_TMS,
EXT_MIPI_TCK,
EXT_MIPI_TRST
EXT_MIPI_TDO,
EXT_MIPI_EMU0,
EXT_MIPI_EMU1
(ExternalJTAG)
XDS110_TDI,
XDS110_TMS,
XDS110_TCK,
XDS110_TRST
XDS110_TDO,
XDS110_EMU0,
XDS110_EMU1
(OnboardJTAG)
Figure 3-8. JTAG Mux
Table 3-11. JTAG 1:2 Mux selection
Condition MUX_SEL Function
XDS110 Powered via USB HIGH A<->B2 port [On Board EMU]
External Emulator attached LOW A<->B1 port [EXTERNAL EMU]
www.ti.com EVM User Setup/Configuration
SPRUIS4D – MAY 2020 – REVISED MARCH 2022
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Jacinto7 J721E/DRA829/TDA4VM Evaluation Module (EVM) 23
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