Analog Devices ADSP-21369 EZ-KIT Lite, Руководство пользователя

Страница: 44 / 95

System Architecture
2-6 ADSP-21369 EZ-KIT Lite Evaluation System Manual
The DPI pins are connected to the SPI flash memory, SPI of the
AD1835A codec, a UART, a 20-pin header, and five LEDs.
Figure 2-3
illustrates the EZ-KIT Lite’s connections to the DPI.
To use the DPI for a different purpose, disable any signal driving a DPI
pin with a switch (see
“UART Enable Switch (SW5)” on page 2-12 ). Any
DPI pin connected to a LED can be used without having to disconnect
the pin. You can, however, see the respective LED turn
ON
and
OFF
when
the signal is used elsewhere on the board.
All of the DPI signals are available externally via the expansion interface
connectors (
J1—3
) and 0.1” spaced header (
P3
). The pinout of the connec-
tors can be found in “ADSP-21369 EZ-KIT Lite Schematic” on page B-1 .
FLAG Pins
The processor has four general-purpose I/O flag pins. Table 2-1 describes
the flag pin connections.
For information on how to disable a push button from driving its corre-
sponding flag pin, see
“Push Button Enable Switch (SW7)” on page 2-13 .
The
FLAG
signals are available externally via the expansion interface con-
nectors (
J1—3
). The pinout of the connectors can be found in
“ADSP-21369 EZ-KIT Lite Schematic” on page B-1 .
Table 2-1. I/O FLAG Pins
Processor FLAG Pin EZ-KIT Lite Function
FLAG0
Push button (
SW2
) input
FLAG1
Push button (
SW2
) input
FLAG2
SDRAM chip select
FLAG3 LED8