Programming Examples - Analog Devices ADSP-BF506F Hardware Reference Manual

Programming Examples

However, the PPI still automatically reinitializes to count to the value pro-
grammed in
PPI_FRAME

In ITU-R 656 modes, a frame start detect happens on the falling
edge of
In RX mode with three external frame syncs, a frame start detect
refers to a condition where a
assertion of
of field 1. Note that
asserted, not when
synchronize to the start of the very first frame after the PPI is
enabled. It is subsequently ignored.
When using RX mode with three external frame syncs, and only
two syncs are needed, configure the PPI for 3-frame-sync operation
and provide an external pull-down to
PPI Lines Per Frame Register (PPI_FRAME)
15 14 13 12 11 10
0 0 0 0
Figure 20-17. PPI Lines Per Frame Register
Programming Examples
The PPI can be configured to receive data from a video source in several
RX modes. The following programming examples
Listing 20-5) describe the ITU-R 656 entire field input mode.
20-34
, and data transfer continues.
, the field indicator. This occurs at the start of field 1.
F
while
PPI_FS1
PPI_FS3
PPI_FS2
9 8 7 6 5
0 0 0 0 0 0 0
ADSP-BF50x Blackfin Processor Hardware Reference
assertion is followed by an
PPI_FS2
is low. This occurs at the start
PPI_FS3
only needs to be low when
asserts. Also,
PPI_FS3
for the
GND
4 3 2 1 0
Reset = 0x0000
0 0 0 0 0
PPI_FRAME[15:0]
Holds the number of lines
expected per frame of data
(Listing 20-1
is
PPI_FS1
is only used to
pin.
PPI_FS3
through