General-Purpose Ppi Modes - Analog Devices ADSP-BF506F Hardware Reference Manual

Functional Description
occur from the start of a frame until it decodes the end-of-frame condition
(transition from
processed is compared against the value in
match, the
FT_ERR
if an SAV transition is missed, the current field will only have
rows, but resynchronization will reoccur at the start of the next frame.
1
Upon completing reception of an entire field, the field status bit is toggled
in the
PPI_STATUS
can discern which field was just read in.

General-Purpose PPI Modes

The general-purpose PPI modes are intended to suit a wide variety of data
capture and transmission applications.
modes. If a particular mode shows a given
used, this implies that the pin is available for its alternate, multiplexed
functions.
Table 20-3. General-Purpose PPI Modes
GP PPI Mode
RX mode, 0 frame syncs, external
trigger
RX mode, 0 frame syncs, internal
trigger
RX mode, 1 external frame sync
RX mode, 2 or 3 external frame syncs Input
RX mode, 2 or 3 internal frame syncs Output
TX mode, 0 frame syncs
TX mode, 1 external frame sync
20-12
= 1 to = 0). At this time, the actual number of lines
F F
bit in the
PPI_STATUS
register. This way, an interrupt service routine (ISR)
PPI_FS1
Direction
Input
Not used
Input
Not used
Input
ADSP-BF50x Blackfin Processor Hardware Reference
. If there is a mis-
PPI_FRAME
register is asserted. For instance,
Table 20-3 summarizes these
frame sync not being
PPI_FSx
PPI_FS2 PPI_FS3
Direction Direction
Not used Not used
Not used Not used
Not used Not used
Input Input (if
used)
Output Output (if
used)
Not used Not used
Not used Not used
NUM_ROWS –
Data
Direction
Input
Input
Input
Input
Input
Output
Output