Spectrum Digital XDS560R Installation Manual page 34

Distributor of Spectrum Digital Inc: Excellent Integrated System Limited
Datasheet of 702570 - TARGET ADAPTER CBL 20P CTI JTAG
Contact us: sales@integrated-circuit.com Website: www.integrated-circuit.com
The CBT device could be used to limit the number of devices that the driving
EMU0-EMU1 signal is loaded with; thereby limiting the amount of capacitance loading
that is seen by the driving EMU0-EMU1 signal.
Using this solution would require the user to have a manual jumper selection to enable
which bank of devices that emulator would able to establish HSRTDX communication
with.
Figure 3-9 shows a possible solution to minimize the loading effects of having too many
target devices connected on the EMU0/EMU1 signals.
Please refer to Section 3.5 for recommended connections of the JTAG signals.
Bank En0
Bank En1
GND
Vcc I/O
Emulation Header
5
TVD
EMU0
EMU1
4
TRST
GND
TMS
6
GND
TDI
8
GND
TDO
10
GND
TCK
12
GND
TCK_RET
GND
Figure 3-9, Bank Selection of EMU Signals
VCC
1
2
3
HDR 3x1
SN74CBT3125
1
1OE
VCC
2
1A 1B
4
13
2OE
2B
14 5
2A 3B
2
10
3OA 4B
1
9
3A GND
3
13
7 4OE
12
11 4A
9
Spectrum Digital, Inc
VCC
Target Device
(4 or more)
EMU0
EMU1
TRST
TMS
+5V
TDI
TDO
TCK
14
3
Target Device
6
(4 or more)
8
EMU0
11
EMU1
7
TRST
TMS
TDI
VCC
TDO
TCK
GND
3-15