Datasheet

System Architecture
2-2 Blackfin A-V EZ-Extender Manual
System Architecture
A block diagram of the Blackfin A-V EZ-Extender is shown in Figure 2-1.
Not shown in the diagram is the analog audio interface, which is a simple
connection between the serial port of the processor and the AD1836A
audio codec. The audio interface connects directly to
SPORT0 of the expan-
sion interface.
In Figure 2-1, unidirectional buffers are show as triangle symbols, while
bidirectional buffers are shown as two overlapping triangles. For both
types of buffers, the output-enable signal comes out of the top and is
active
LOW. For the bidirectional buffers, a second signal for the direction is
shown. When this net is pulled HIGH, the buffer is driving in the direction
of the arrow in the center, when
LOW, the buffer is driving in the opposite
direction.
L
Before applying power to the system, follow the steps in “A-V
EZ-Extender Setup” on page 1-1.
Video interfaces can be split into two main signal sets:
VID_IN and
VID_OUT. Both signal sets consist of a 16-bit data bus, two frame sync sig-
nals, and data clock.
VID_IN connects to the video decoder and all of the
camera interfaces.
VID_IN connects only to the PPI0 of the EZ-KIT Lite.
VID_OUT connects to the video encoder and the flat panel display interface.
On the expansion interface, VID_OUT connects to either the PPI0 or PPI1 of
the EZ-KIT Lite.
Table 2-1 summarizes the signals coming and going on the expansion
interface connectors.