12 Digital Audio Interface; Structure Of The Dai - Analog Devices ADSP-21261 SHARC Hardware Reference Manual

12 DIGITAL AUDIO INTERFACE

The Digital Audio Interface (DAI) is comprised of a group of peripherals
and the signal routing unit (SRU). The inputs and outputs of the periph-
erals are not directly connected to external pins. Rather, the SRU connects
the peripherals to a set of pins and to each other, based on a set of config-
uration registers. This allows the peripherals to be interconnected to suit a
wide variety of systems. It also allows the ADSP-2126x processor to
include an arbitrary number and variety of peripherals while retaining
high levels of compatibility without increasing pin count.

Structure of the DAI

The DAI incorporates a set of peripherals and a very flexible routing (con-
nection) system permitting a large combination of signal flows. A set of
DAI-specific registers make such design, connectivity, and functionality
variations possible. All routing related to peripheral states for the DAI
interface is specified using DAI registers. For more information on pin
states, refer to
The function of the DAI in the ADSP-2126x processors can be compared
with the SPORTs' communication with the core. SPORTs communicate
with the core directly, just as the DAI communicates directly with the
core. The DAI, however, makes use of the SRU to communicate with the
core.
The DAI may be used to connect any combination of inputs to any com-
bination of outputs. This function is performed by the SRU via
memory-mapped registers.
ADSP-2126x SHARC Processor Hardware Reference
Figure 12-5 on page 12-8.
12-1