Spi Interface; Flag Pins - Analog Devices ADSP-21262 EZ-KIT Lite Manual

System Architecture

SPI Interface

FLAG Pins

3-6
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The DSP's serial peripheral interconnect (SPI) interface is connected to an
SPI Flash memory, the CS8416 SPDIF receiver, and the AD1835A audio
codec. The pin is used as a memory select for accessing the SPI
FLAG0
Flash memory, and the
FLAG3
configuration registers.
All of the SPI signals are available externally via the expansion interface
connectors ( ), as well as the 0.1' spaced header
J3–1
these connectors can be found in
The DSP has four general-purpose IO
connection of each flag.
Table 3-1. IO FLAG Pins
FLAG Pin EZ-KIT Lite Function
SPI Flash chip select
FLAG0
Push button (
FLAG1
Push button (
FLAG2
AD1835A SPI interface chip select
FLAG3
For information on how to disable the push buttons from driving the cor-
responding DSP flag pin, see section
on page 3-10.
The signals are available externally via the expansion interface con-
FLAG
nectors ( ). The pinout of these connectors can be found in
J3–1
"Schematics" on page B-1.
ADSP-21262 EZ-KIT Lite Evaluation System Manual
pin is used for accessing the AD1835A's
"Schematics" on page
pins. Table 3-1
FLAG
) input
SW1
) input
SW2
"Push Button Enable Switch (SW9)"
. The pinout of
P2
B-1.
describes the