NOTE: Transparent mode addresses the needs of embedded systems
designers who require the DSP to boot and/or relinquish control of its
busses on power up.
If the target does not respond to the reset and does not assert /EBG (i.e.
bus not granted), or if no target is connected, the transparent mode is
entered. In transparent mode the emulation enable (/EE) pin is pulled low
disabling the emulation function. This means the EZ-ICE probe is ignored
by the target and can be inserted into a live target with out interfering with
target code execution. The FLASH code will still respond to the host
program and is capable of interrupting the target.
This behavior is particularly useful in debugging a real-time stand-alone
system. For example, if the target is stuck in an erroneous infinite loop, the
EZ-ICE can be used to discover the condition under which this behavior is
occurring.
3.6.5 Emulator Space
Following the establishment of communications between the EZ-ICE board
and VisualDSP, the EZ-ICE board enters emulator space. This means that
the DSP is processing an emulator interrupt. When the DSP is processing
an emulator interrupt:
?
?
?
Valid memory strobes to the target stop
Target /BR and /RESET are ignored
No execution of user code from internal memory occurs
NOTE : If the DSP has encountered an invalid opcode, the core processor
will lockup. When this happens, the emulator will not be able to
communicate with the DSP. This will occur if an invalid opcode is read
from a non-existent memory location, or read/write timing specifications for
external memory are not followed.
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