ETAS
Technical Data
XETK-S21.0B
-
User
Guide
40
7.8.2
JTAG Timing Parameters
7.8.3
Debugger Arbitration Timing Diagram
7.8.4
Debugger Arbitration Timing Parameters
Parameter
Symbol
Value [ns]
Comment
JTAG Clock Period
(ETK --> Target)
t
tck
50
20 MHz Nexus JTAG
Clock Frequency
25
40 MHz Nexus JTAG
Clock Frequency
20
50 MHz Nexus JTAG
Clock Frequency
TMS/TDI Set-Up Time
(ETK --> Target)
t
setup
7 (min.)
Minimum 5 ns required
for microcontroller
TMS/TDI Hold Time
(ETK --> Target)
t
hold
7 (min.)
Minimum 5 ns required
for microcontroller
TDO clock-to-out time
(Target --> ETK)
t
do_min
2.25 (min.) Minimum 2.25 ns
required by microcontrol
-
ler specification
t
do_max
16 (max)
Maximum 16 ns by
microcontroller specifica
-
tion
Parameter
Value [ns]
d_tck (Debugger --> XETK)
9
d_tdi (Debugger --> XETK)
9
d_tms (Debugger --> XETK)
9
d_trst (Debugger --> XETK)
9
d_tdo (XETK --> Debugger)
9
