ADSP-21368 SHARC Processor Hardware Reference 4-43
Digital Audio/Digital Peripheral Interfaces
Group E Connections—Interrupts and Miscellaneous
Signals
Group E connections, shown in Table 4-8 on page 4-45, are slightly dif-
ferent from the others in that the inputs and outputs being routed vary
considerably in function. This group routes control signals (interrupts and
miscellaneous signals) and provides a means of connecting signals between
groups. Signals with names such as
MISCxy appear as inputs in group E,
but do not directly feed any peripheral. Rather, they reappear as outputs
in group D and group F. The registers for this group are shown in
Figure 4-35 and Figure 4-36.
Additional connections among groups D, E, and F provide a surprising
amount of utility. Since group D routes signals off chip and group F dic-
tates pin direction, these few signal paths enable an enormous number of
possible uses and connections for DAI pins. A few examples include:
• One pin’s input can be patched to another pin’s output, allowing
board-level routing under software control.
• A pin input can be patched to another pin’s enable, allowing an
off-chip signal to gate an output from the processor.
• Any of the DAI pins can be used as interrupt sources or gen-
eral-purpose I/O (GPIO) signals.
• Many types of bidirectional signaling may be created by routing an
output of the PCG to a pin enable.
The SRUs enable many possible functional changes, both internally and
externally. Used creatively, the SRUs allow system designers to radically
change functionality at run time, and to potentially reuse circuit boards
across many products.
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