SMJ320C80 Datasheet, PDF (150/157 Pages) Texas Instruments – DIGITAL SIGNAL PROCESSOR

SMJ320C80
DIGITAL SIGNAL PROCESSOR
SGUS025A – AUGUST 1998 – REVISED JUNE 2002
emulator-interface connection (continued)
For multiprocessor applications, the following conditions are recommended:
D To reduce timing skew, buffer TMS, TDI, TDO, and TCK through the same physical package.
D If buffering is used, 4.7-kΩ resistors are recommended for TMS, TDI, and TCK, which should be pulled
high (3.3 V).
D Buffering EMU0 and EMU1 is recommended highly to provide isolation. The buffers need not be in the
same physical package as TMS, TCK, TDI, or TDO. Pullups to 3.3 V are required and should provide
a signal rise time of less than 10 µs. A 4.7-kΩ resistor is suggested for most applications.
D To ensure high-quality signals, special printed wire board (PWB) routing and use of termination resistors
may be required. The emulator provides fixed series termination (33 Ω) on TMS and TDI, and optional
parallel terminators (180-Ω pullup and 270-Ω pulldown) on TCKRET and TDO.
3.3 V
3.3 V
T34
EMU0
J35
EMU1
L33
TRST
N33
TMS
H34
TDI
P32
TDO
E35
TCK
’C80
T34
EMU0
J35
EMU1
L33
TRST
N33
TMS
H34
TDI
P32
TDO
E35
TCK
3.3 V
13
5
EMU0
PD
14
EMU1
2
4
TRST GND
1
6
TMS
GND
3
8
TDI
GND
7
10
TDO
GND
11
12
TCK
GND
9
TCKRET
Emulator
Header
’C80
Figure 127. Emulation Header Connections – Multiprocessor Applications
150
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