User's Manual l MBa335x UM 0202 l © 2018, TQ-Systems GmbH
Page 38
4.2.12
JTAG & EMU
N
P
1
0
k
1
0
k
N
P
1
0
k
Illustration 35:
Block diagram JTAG
The JTAG interface is routed to a 20-pin header (X24). The pull-ups/downs required for the signals TDI, TMS, TRST# and TCK are
assembled on the MBa335x and can partly be reconfigured. All signals use 3.3 V as a reference. The JTAG interface has no ESD
protection.
The TQMa335x can be reset via JTAG. PWRONRST_IN# is used as reset input for the TQMa335x by default. The configuration can
be changed according to Table 69.
Table 69:
Reset source for JTAG-Reset
Option
R431
R432
JTAGRST# at WARMRST#
0 Ω
NP
JTAGRST# at PWRONRST_IN# (default assembly)
NP
0 Ω
In addition to the JTAG signals at X24 five EMU signals are available at X25. These signals are partially multiplexed with other
functions, e.g. the MCASP (audio) interface. Table 70 to Table 72 show the assembly options. EMU0 and EMU1 define the JTAG
mode.
Table 70:
Reset source for EMU.2
Option
R406
R407
MCASP0_FSR at MCASP0.FSR (default assembly)
0 Ω
NP
MCASP0_FSR at EMU.2
NP
0 Ω
Table 71:
Reset source for EMU.4
Option
R408
R409
MCASP0_AXR3 at MCASP0.AXR3 (default assembly)
0 Ω
NP
MCASP0_AXR3 at EMU.4
NP
0 Ω
Table 72:
Reset source for EMU.3
Option
R410
R411
MCASP0_AXR1 at MCASP0.AXR1 (default assembly)
0 Ω
NP
MCASP0_FSR at EMU.3
NP
0 Ω
