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| 型號： | DSPCOMMANDUM |
| 英文描述： | Universal Command Converter for DSP User＇s Manual |
| 中文描述： | 通用命令轉(zhuǎn)換為數(shù)字信號處理器用戶手冊 |
| 文件頁數(shù)： | 41/70頁 |
| 文件大小： | 550K |
| 代理商： | DSPCOMMANDUM |
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Host Computer Hardware
Motorola
Functional Description
3-9
Figure 3-7. Fan Out of TCK at Source
Either configuration above is equally valid. The choice will depend on practical
considerations related to each project, or a combination could be used.
JTAG signal TMS may also need some consideration. Although TMS is not subject to the
strict requirements as TCK, it is still important that TMS has settled to a valid level at the
rising edge of TCK.
3.1.8 Resetting Target DSP Devices.
The RESET signal and TRST signals from the command converter are typically connected
to all target devices on a JTAG chain. RESET and TRST are asserted by the ADS
command FORCE R. All devices on the JTAG chain handling the specified command
converter device are reset. Execution control is established immediately after deassertion
of TRST before any instructions are executed. The sequence of events is illustrated in
Figure 3-8. Because all targets on the JTAG chain are connected to the same RESET
signal, all devices enter reset. The JTAG controller is still active after deassertion of TRST
during reset, and while RESET is held low, the JTAG instruction DEBUG_REQ is
clocked in. When RESET is deasserted, the device is immediately in Debug mode, with no
instructions executed since releasing RESET.
Figure 3-8. Reset JTAG Device with RESET Signal
TCK
TCK
TCK
TCK
TCK
TCK
TCK
TCK
TCK
TCK
TCK
TCK
TCK
1
TCK
2
TCK
n
AA1951
RESET
INSTRUCTION
REGISTER
DEBUG_REQ
1
2
3
1
2
3
COMMAND CONVERTER
ASSERTS RESET. ALL
TARGETS ENTER RESET.
JTAG INSTRUCTION
DEBUG_REQUEST IS
LOADED.
COMMAND CONVERTER
RELEASES RESET. TARGETS
EXIT RESET IN DEBUG MODE.
AA1969
1
TRST
JTAG RESET
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