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參數(shù)資料
| 型號： | SMJ320C50GFA |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | DIGITAL SIGNAL PROCESSOR |
| 中文描述： | 數(shù)字信號處理器 |
| 文件頁數(shù)： | 19/54頁 |
| 文件大?。?/td> | 614K |
| 代理商： | SMJ320C50GFA |
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SM320VC33, SMJ320VC33
DIGITAL SIGNAL PROCESSOR
SGUS034E - FEBRUARY 2001 - REVISED OCTOBER 2002
19
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251-1443
JTAG emulation
Though the 320VC33 contains a JTAG debug port which allows multiple JTAG enabled chips to be
daisy-chained, boundary scan of the pins is not supported. If the pin scan path is selected, it will be routed
through a null register with a length of one. For additional information concerning the emulation interface, see
JTAG/MPSD Emulation Technical Reference
(literature number SPDU079).
designing a target system emulator connector (14-pin header)
JTAG target devices support emulation through a dedicated emulation port. This port is a superset of the test
access port standard and is accessed by the emulator. To communicate with the emulator,
the target system
must have a 14-pin header
(two rows of seven pins) with the connections that are shown in Figure 11. Table 7
describes the emulation signals.
TDO
7
8
GND
TMS
1
2
TRST
TDI
3
4
GND
TCK_RET
9
11
10
12
GND
GND
TCK
Header Dimensions:
Pin-to-pin spacing, 0.100 in. (X,Y)
Pin width, 0.025-in. square post
Pin length, 0.235-in. nominal
PD (V
CC
)
5
6
no pin (key)
EMU0
13
14
EMU1
While the corresponding female position on the cable connector is plugged to prevent improper
connection, the cable lead for
pin 6 is present in the cable and is grounded, as shown in the
schematics and wiring diagrams in this document.
Figure 11. 14-Pin Header Signals and Header Dimensions
Table 7. 14-Pin Header Signal Descriptions
SIGNAL
DESCRIPTION
EMULATOR
STATE
TARGET
STATE
TMS
Test mode select
O
I
TDI
Test data input
O
I
TDO
Test data output
I
O
TCK
Test clock. TCK is a 10.368-MHz clock source from the emulation cable pod.
This signal can be used to drive the system test clock
O
I
TRST
§
EMU0
EMU1
Test reset
O
I
Emulation pin 0
I
I/O
Emulation pin 1
I
I/O
PD(V
CC
)
Presence detect. Indicates that the emulation cable is connected and that the
target is powered up. PD should be tied to V
CC
in the target system.
Test clock return. Test clock input to the emulator. May be a buffered or unbuf-
fered version of TCK.
I
O
TCK_RET
I
O
GND
Ground
I = input; O = output
Use 1-50K pullups for TMS, EMU0 and EMU1.
§
Use 1-50K pulldown for TRST. Do not use pullup resistors on TRST: it has an internal pulldown device. In a low-noise environment, TRST can
be left floating. In a high-noise environment, an additional pulldown resistor may be needed. (The size of this resistor should be based on electrical
current considerations.)
EMU0 and EMU1 are I/O drivers configured as open-drain (open-collector) drivers. They are used as bidirectional signals for emulation global
start and stop.
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