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19
JTCK
JTMS
TAP
state
JTDI
JTDO
Figure 19.4.3 IR Path Sequence
JTDI input is sampled at rise
of JTCK in "Shift-IR" state.
Don't Care
LSB value
High impedance
1
JTDO is output at fall of
JTCK in "Shift-IR" state.
Instruction code is set in the parallel output
stage at fall of JTCK in "Update-IR" state.
Instruction code (6 bits)
MSB value
0
0
0
1
Shift output from the
instruction register is
fixed to b'110001.
19-9
19.4 Basic Operation of JTAG
Don't Care
High impedance
1
Finished storing instruction
code in the instruction
register's shift register stage.
JTAG
Ver.0.10
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