Analog Devices ADSP-21261 SHARC Hardware Reference Manual page 528

Signal Routing Unit
compatible such that almost any output-to-input patch makes functional
sense.
Inputs to
peripherals in DAI
(signal sinks)
Outputs from
peripherals in DAI
(signal sources)
Figure 12-3. Group A as a Patch Bay
The SRU contains six groups that are named sequentially A through F.
Each group routes a unique set of signals with a specific purpose. For
example, Group A routes clock signals, Group B routes serial data signals,
and Group C routes frame sync signals. Together, the SRU's six groups
include all of the inputs and outputs of the DAI peripherals, a number of
additional signals from the core, and all of the connections to the DAI
pins.
Each input and output in each group is given a unique mnemonic. In the
few cases where a signal appears in more than one group, the mnemonic is
slightly different to distinguish between the connections. The convention
is to begin the name with an identifier for the peripheral that the signal is
coming to/from followed by the signal's function. A number is included if
the DAI contains more than one peripheral type (for example, serial ports)
or if the peripheral has more than one signal that performs this function
12-6
SRU: GROUP A
ADSP-2126x SHARC Processor Hardware Reference