ADSP-21368 SHARC Processor Hardware Reference 4-65
Digital Audio/Digital Peripheral Interfaces
DPI GPIO and Flags
In the DPI, the EXT_MISC signals are used for general-purpose I/O. An
interrupt controller processes these signals to generate an interrupt, for
example DPI_INT. The EXT_MISC signals can also be used to control pin
enables. Flags 4-15 can be routed using the DPI pins.
Miscellaneous Signals
In the ADSP-21367/8/9 and ADSP-2137x processors, exception applica-
tions can also configure signals to:
• Act as interrupt sources
• Act as inverted signals (forcing a signal to active low)
• Connect one pin to another
• Act as pin enables
DAI/DPI Interrupt Controller
The DAI contains a dedicated interrupt controller that signals the core
when DAI peripheral events occur.
Relationship to the Core
Generally, interrupts are classified as catastrophic or normal. Catastrophic
events include any hardware interrupts (for example, resets) and emula-
tion interrupts (under the control of the PC), math exceptions, and
“reads” of memory that do not exist. Catastrophic events are treated as
high priority events. In comparison, normal interrupts are “determinis-
tic”—specific events emanating from a source (the causes), the result of
which is the generation of an interrupt. The expiration of a timer can
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