Analog Devices Blackfin ADSP-BF537 Hardware Reference Manual page 348

Functional Description
VERTICAL
BLANKING
FIELD 1
ACTIVE VIDEO
VERTICAL
BLANKING
FIELD 2
ACTIVE VIDEO
EAV SAV
VERTICAL
BLANKING
FIELD 1
ACTIVE VIDEO
VERTICAL
BLANKING
FIELD 2
ACTIVE VIDEO
VERTICAL
BLANKING
EAV SAV
Figure 7-3. Typical Video Frame Partitioning for NTSC/PAL Systems for
ITU-R BT.656-4
The SAV and EAV codes are shown in more detail in
there is a defined preamble of three bytes (0xFF, 0x00, 0x00), followed by
the XY status word, which, aside from the
and (horizontal blanking) bits, contains four protection bits for sin-
H
gle-bit error detection and correction. Note
change as part of EAV sequences (that is, transition from
The bit definitions are as follows:
• for field 1
F = 0
• for field 2
F = 1
7-8
LINE #
1
LINE 4
FI ELD 1
20
264
LINE 266
FI ELD 2
283
525
LINE 3
1 LINE 1
FI ELD 1
23
311
LINE 313
336
FI ELD 2
624
625
LINE 625
ADSP-BF537 Blackfin Processor Hardware Reference
F V
LINE
NUMBER
1 1
1-3,
266-282
4-19, 0 1
264-265
20-263 0 0
283-525 1 0
F V
LINE
NUMBER
0 1
1-22,
311-312
23-310 0 0
313-335, 1 1
624-625
336-623 1 0
Table 7-3. Note
(field), (vertical blanking)
F V
and are only allowed to
F V
H = 0
H H
(EAV) (SAV)
1 0
1 0
1 0
1 0
H H
(EAV) (SAV)
1 0
1 0
1 0
1 0
to ).
H = 1