3.4.5 JTAG
The GP EVM includes XDS110 class embedded JTAG emulation through the micro B connector J28. It also
has an optional TI20 pin (J25) connector to support external JTAG emulation. When an external emulator is
connected, internal emulation circuitry will be disabled.
The design includes the footprint for a MIPI60 (J33) connector with connections for JTAG and trace capabilities.
The trace pins are pinmuxed with GPMC signals which, by default, are connected to HSE connector on the
processor board. Resistor networks are used to steer these signals to either the HSE connector or to the MIPI60
connector. The MIPI60 is not installed as delivered.
Resistor options are provided to connect these signals to the HSE or Trace connector as mentioned in the
.
The pinout of TI20 pin connector and MIPI60 pin connector are given in
respectively.
Table 3-13. Selection of HSE Connector and JTAG TRACE Functionality
Signals Selected
Mount
Un Mount
HSE Connector
(default)
RA1
RA2
RA3
RA4
RA5
RA6
R390
R391
R393
R392
JTAG Trace signals to J33
RA2
RA1
RA4
RA3
RA6
RA5
R391
R390
R392
R393
Table 3-14. TI20 Pin Connector (J25) Pin-Out
Pin No.
Signal
Pin No.
Signal
1
JTAG_CTI_TMS
11
JTAG_CTI_TCK
2
JTAG_TRSTN
12
DGND
3
JTAG_CTI_TDI
13
JTAG_EMU0
4
JTAG_TDIS
14
JTAG_EMU1
5
VCC_3V3_SYS
15
JTAG_EMU_RSTN
6
NC
16
DGND
7
JTAG_TDO
17
NC
8
SEL_XDS110_INV
18
NC
9
JTAG_CTI_RTCK
19
NC
10
DGND
20
DGND
System Description
SPRUIX0B – FEBRUARY 2021 – REVISED MARCH 2021
AM64x GP EVM User's Guide
21
Copyright © 2021 Texas Instruments Incorporated