TMS320F28075PZP datasheet(55/192 Pages) TI

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7.9.5 Emulation/JTAG

The JTAG port has five dedicated pins: TRST, TMS, TDI, TDO, and TCK. The TRST signal should always be

pulled down through a 2.2-kΩ pulldown resistor on the board. This MCU does not support the EMU0 and EMU1

signals that are present on 14-pin and 20-pin emulation headers. These signals should always be pulled up at

the emulation header through a pair of board pullup resistors ranging from 2.2 kΩ to 4.7 kΩ (depending on the

drive strength of the debugger ports). Typically, a 2.2-kΩ value is used.

See Figure 7-9 to see how the 14-pin JTAG header connects to the MCU’s JTAG port signals. Figure 7-10 shows

how to connect to the 20-pin header. The 20-pin JTAG header terminals EMU2, EMU3, and EMU4 are not used

and should be grounded.

The PD (Power Detect) terminal of the JTAG debug probe header should be connected to the board 3.3-V

supply. Header GND terminals should be connected to board ground. TDIS (Cable Disconnect Sense) should

also be connected to board ground. The JTAG clock should be looped from the header TCK output terminal back

to the RTCK input terminal of the header (to sense clock continuity by the JTAG debug probe). Header terminal

RESET is an open-drain output from the JTAG debug probe header that enables board components to be reset

through JTAG debug probe commands (available only through the 20-pin header).

Typically, no buffers are needed on the JTAG signals when the distance between the MCU target and the JTAG

header is smaller than 6 inches (15.24 cm), and no other devices are present on the JTAG chain. Otherwise,

each signal should be buffered. Additionally, for most JTAG debug probe operations at 10 MHz, no series

resistors are needed on the JTAG signals. However, if high emulation speeds are expected (35 MHz or so), 22-Ω

resistors should be placed in series on each JTAG signal.

For more information about hardware breakpoints and watchpoints, see Hardware Breakpoints and Watchpoints

for C28x in CCS.

For more information about JTAG emulation, see the XDS Target Connection Guide.

TMS

TDI

TDO

RTCK

TCK

EMU0

TRST

TDIS

GND

KEY

GND

EMU1

GND

TCK

TDO

TDI

TMS

TRST

GND

3.3 V

100 W

2.2 kW

4.7 kW

3.3 V

Distance between the header and the target

should be less than 6 inches (15.24 cm).

MCU

Figure 7-9. Connecting to the 14-Pin JTAG Header

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TMS320F28076, TMS320F28075

SPRS902J – OCTOBER 2014 – REVISED FEBRUARY 2021

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TMS320F28075PZP Datasheet(PDF) 55 Page - Texas Instruments

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