Texas Instruments TMDSEMU560V2STM-U - Blackhawk XDS560v2 System Trace USB Emulator TMDSEMU560V2STM-U TMDSEMU560V2STM-U 데이터 시트
제품 코드
TMDSEMU560V2STM-U
Connections Between the Emulator and the Target System
3-12
3.7
Connections Between the Emulator and the Target System
It is extremely important to provide high-quality signals between the emulator
and the JTAG target system. Depending upon the situation, you must supply
the correct signal buffering, test clock inputs, and multiple processor intercon-
nections to ensure proper emulator and target system operation.
and the JTAG target system. Depending upon the situation, you must supply
the correct signal buffering, test clock inputs, and multiple processor intercon-
nections to ensure proper emulator and target system operation.
Signals applied to the EMU0 and EMU1 pins on the JTAG target device can
be either an input or an output (I/O). In general, these two pins are used as both
input and output in multiprocessor systems to handle global run/stop opera-
tions.
be either an input or an output (I/O). In general, these two pins are used as both
input and output in multiprocessor systems to handle global run/stop opera-
tions.
3.7.1
Buffering Signals
If the distance between the emulation header and the JTAG target device is
greater than six inches, the emulation signals must be buffered. If the distance
is less than six inches, no buffering is necessary. The following illustrations de-
pict these two situations.
greater than six inches, the emulation signals must be buffered. If the distance
is less than six inches, no buffering is necessary. The following illustrations de-
pict these two situations.
Figure 3−4. Unbuffered Signal Connections
EMU0
EMU1
EMU1
TRST
TMS
TDI
TDO
TCK
TCK_RET
TVD
GND
GND
GND
GND
GND
GND
GND
GND
GND
13
14
14
1
2
9
11
7
3
Emulation header
VCC I/O
VCC I/O
EMU0
EMU1
TRST
TMS
TDI
TDO
TCK
EMU1
TRST
TMS
TDI
TDO
TCK
Target device
6 inches or less
5
4
6
8
6
8
10
12
12
-
No signal buffering. In this situation, the distance between the header and
the JTAG target device should be no more than six inches.
the JTAG target device should be no more than six inches.
The EMU0 and EMU1 signals must have pull-up resistors connected to V
CC
to provide a signal rise time of less than 10
µ
s. A 4.7-k
Ω
resistor is suggested
for most applications.
Buffered transmission signals. In this situation, the distance between the
emulation header and the processor is greater than six inches. Emulation sig-
nals TMS, TDI, TDO, and TCK_RET are buffered through the same package.
emulation header and the processor is greater than six inches. Emulation sig-
nals TMS, TDI, TDO, and TCK_RET are buffered through the same package.