Spectrum Digital, Inc
2-5
2.4 Buffering Signals Between the Emulator and the Target System
It is extremely important to provide high-quality signals between the emulator and
the ‘C3x on the target system. In many cases, the signal must be buffered to produce
a high-quality signal. The need for signal buffering and placement of the emulation
header can be divided into three categories:
__
No signal buffering. In this situation, the distance between the header and
the ‘C3x should be no more than 2 inches.
__
Buffered emulation signals. In this situation, the distance between the
emulation header and the ‘C3x is greater than 2 inches but less than 6 inches.
The transmission signals ---H3 and EMU3--- are buffered through the same
package.
H3
EMU3
EMU2
EMU1
EMU0
TMS320C3x
2 Inches or less
3
1
5
9
11
H3
EMU3
EMU2
EMU1
EMU0
+5V
GND
GND
GND
GND
GND
GND
GND
Header
Emulator
12
10
8
6
4
2
7
PD
H3
EMU3
EMU2
EMU1
EMU0
TMS320C3x
2 Inches or less
3
1
5
9
11
H3
EMU3
EMU2
EMU1
EMU0
+5V
GND
GND
GND
GND
GND
GND
GND
Header
Emulator
12
10
8
6
4
2
7
PD
