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Signal description (JTAG communication)
Below shows description of I/O signal from target side during JTAG communication
(”I/O” means input and output direction from view of probe side.)
Signal
Name
JTAG
Mode
Meaning
I/O
Type
IO1
TCK
TCK output of JTAG
O
A
IO2
TDI
Transmitted data output of JTAG
O(I/O)
A
IO3
TDO
Received data input of JTAG
I(I/O)
A
IO4
TMS
TMS output of JTAG
O(I/O)
A
IO5
nTRST nTRES output of JTAG
O(I/O)
A
IO6
TAUX2
I/O terminal (definition varies according to definition program)
I/O
A
IO7
TAUX3
I/O terminal (definition varies according to definition program)
I/O
A
IO8
TAUX4
I/O terminal (definition varies according to definition program)
I/O
B
IO9
TMODE
I/O terminal (definition varies according to definition program)
I/O
B
IO10
/TICS
I/O terminal (definition varies according to definition program)
I/O
B
VCC
5V output (MAX 100mA)
O
C
/TRES
Re-set output of negative logic (open collector output) (*1)
O
D
WDT
Watchdog timer output (open collector output) (*1)
O
D
TVccd
User power input (driver power for I/F)
I
E
PROBE SELECT
Terminal selection signal of target probe
I
F
GND
GND
－
－
*1 /TRES, WDT
are open collector signal with 1MΩ pull down.
Please note that no voltage output to target side.
