Analog Devices SHARC ADSP-21375, Руководство пользователя

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System Architecture
2-6 ADSP-21375 EZ-KIT Lite Evaluation System Manual
The DPI pins connect to the SPI flash memory, the SPI interface 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 the DPI
pins 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
using the signal elsewhere on the board.
All of the DPI signals are available externally via the expansion interface
connectors (
J1–3
), as well as the 0.1” spaced header
P3
. The pinout of
these connectors can be found in “ADSP-21375 EZ-KIT Lite Schematic”
on page B-1 .
FLAG Pins
The processor has four general-purpose IO flag pins. Table 2-1 describes
the flag connections.
For information on how to disable a push button from driving its corre-
sponding processor flag pin, see
“Push Button Enable Switch (SW7)” on
page 2-13 .
Table 2-1. IO FLAG Pins
FLAG Pin EZ-KIT Lite Function
FLAG0
Push button (
SW2
) input
FLAG1
Push button (
SW2
) input
FLAG2
SDRAM chip select
FLAG3 LED8