Using A Target System Clock - Spectrum Digital XDS560R Installation Manual

Distributor of Spectrum Digital Inc: Excellent Integrated System Limited
Datasheet of 702570 - TARGET ADAPTER CBL 20P CTI JTAG
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Spectrum Digital, Inc
3.5.2 Using a Target-System Clock
Figure 3-7 shows an application with the system test clock generated in the target
system. In this application, the TCK signal is left unconnected.
Vcc I/O
GND
Note: When the TMS/TDI lines are buffered, pull-up resistors should be used to hold the buffer inputs at a known level when
the emulator cable is not connected.
A benefit to having the target system generate the test clock, there may be other
devices in your system that require a test clock when the emulator is not connected.
The system test clock also serves this purpose.
3-12
Emulation Header
5
13
TVD
EMU0
14
EMU1
2
4
TRST
GND
1
TMS
6
GND
3
TDI
8
GND
7
TDO
10
GND
11
TCK
12
GND
9
TCK_RET
Greater than 6 Inches
Figure 3-7, Target System Generated Test Clock
Vcc I/O
Target Device
EMU0
EMU1
TRST
TMS
TDI
TDO
TCK
System test
Clock
XDS560R JTAG Emulator Installation Guide