Core Hang Conditions - Analog Devices ADSP-21262 EZ-KIT Lite Manual

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Core Hang Conditions

Certain peripheral devices, such as host ports, DMA, and link ports, can
hold off the execution of processor instructions. This is known as a hung
condition and commonly occurs when reading from an empty port or
writing to a full port. If an attempt to halt the processor is made during
one of these conditions, the EZ-KIT Lite may encounter a core hang.
Normally, a core hang can be cleared by the board using a special
clear/abort bit. However, there are cases in which it is desirable or possible
not to clear the core hang. Sometimes it is desirable to wait for the core
hang to clear itself, such as when waiting for a host processor to read or
write data. In other cases, it is not possible to clear the core hang, and a
DSP reset must occur to continue the debugging session.
Table 2-7 describes the EZ-KIT Lite's core hang operations.
Table 2-7. Core Hang Operations
Option Description
Abort Abort the hung operation. This causes the offending instruction to be
aborted in the pipeline.
Retry Allows you to remedy the hung operation. For example, if a host proces-
sor is holding off the DSP, you can cause the host to clear the hung condi-
tion.
Ignore Performs a software reset on the target board.
Clear Aborts the hung operation. This causes the offending instruction to be
aborted in the pipeline.
Acknowledge Allows you to remedy the hung operation. For example, if a host proces-
sor is holding off the DSP, you can cause the host to clear the hung condi-
tion.
Reset Performs a software reset on the target board.
ADSP-21262 EZ-KIT Lite Evaluation System Manual
Using EZ-KIT Lite
2-11