Analog Devices EV-21569-SOM, Руководство пользователя

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3 Hardware Reference
This chapter describes the hardware design of the EV-21569-SOM board.
System Architecture
The Block Diagram figure shows the board configuration.
Figure 3-1: Block Diagram
The EV-21569-SOM board is designed to demonstrate the ADSP-21569 processor’s capabilities. The board has a 25
MHz input clock and runs at a max core clock frequency of 1GHz.
User I/O to the processor is provided in the form of two pushbuttons and three LEDs.
The software-controlled switches (SoftConfig) facilitate the switch multi-functionality by disconnecting the push-
buttons from their associated processor pins and reusing the pins elsewhere on the board.
Software-Controlled Switches (SoftConfig)
On the board, most of the functionality traditionally controlled by mechanical switches and jumpers is controlled by
I
2
C software-controlled switches. The mechanical switches that remain are provided for the boot mode and push
buttons. Reference any
SoftConfig*.c
file found in the installation directory for an example of how to set up
the SoftConfig feature of the board through software. The SoftConfig section of this manual serves as a reference to
any user that intends to modify an existing software example. If software provided by ADI is used, there should be
little need to reference this section.
NOTE:
Be careful when changing SoftConfig settings. When connecting extender cards, configure the settings to
avoid conflict among interfaces so multiple signals are not driven on the same pins.
Overview of SoftConfig
In order to further clarify the use of electronic single FET switches and multi-channel bus switches, an example of
each is illustrated and compared to a traditional mechanical switching solution. This is a generic example that uses
similar FET and bus switch components that are on the board.
Hardware Reference
EV-21569-SOM
®
Manual
3–1