Analog Devices EZ-KIT Lite ADSP-BF533, Руководство пользователя, Страница: 52 / 108

Using Video
2-12 ADSP-BF533 EZ-KIT Lite Evaluation System Manual
Using Video
The board supports video input and output applications. The ADV7171
video encoder provides up to three output channels of analog video, while
the ADV7183 video decoder provides up to three input channels of analog
video. Both the encoder and the decoder connect to the Parallel Peripheral
Interface (PPI) of the ADSP-BF533 processor. For additional information
on the video interface hardware, refer to
“PPI Interface” on page 3-5 .
For the video interface to be operational, the following basic steps must be
performed.
1. Configure the
SW3
DIP switch as required by the application. Refer
to “Video Configuration Switch (SW3)” on page 3-11 for details.
2. Remove reset to the video device. Refer to “Flash General-Purpose
IO” on page 2-7 for details.
3. If using the decoder:
D
Enable device by driving programmable flag output
PF2
to
“
0
”.
D
Select PPI clock (see Table 2-8 on page 2-8 ).
4. Program internal registers of the video device in use. Both video
encoder and decoder use a 2-wire serial interface to access internal
registers. A programmable flag
PF0
functions as a serial clock
(SCL), and
PF1
functions as a serial data (SDAT).
5. Program the ADSP-BF533 processor’s PPI interface (configuration
registers, DMA, etc.).
Example programs are included in the EZ-KIT installation directory to
demonstrate the capabilities of the video interface.