tm1300 NXP Semiconductors, tm1300 Datasheet - Page 109

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.8.3
The End Active Video (EAV) and Start Active Video
(SAV) codes are issued at the start of each video line.
EAV and SAV codes have a fixed format: a 3-byte pre-
amble of 0xFF, 0x00, 0x00 followed by the SAV or EAV
code byte. The EAV and SAV code byte format is shown
in
define the start and end of the horizontal blanking inter-
val, and they also indicate the current field number and
the vertical blanking interval.
The SAV and EAV codes have a 4-bit protection field to
ensure valid codes. The EVO generates these protection
Figure 7-9. Interlaced timing—NTSC analog sync. signals.
Figure 7-10. CCIR 656 pixel timing.
Figure 7-11. CCIR 656 line timing.
Figure 7-12. Format of SAV and EAV timing codes.
VO_DATA[0:7]
Figure 7-12
Video
Lines
Vertical
Sync
VO_CLK
E
SAV and EAV Codes
1 1 1 1 1 1 1 1
Blanking
for reference. The EAV and SAV codes
1
Byte 0
Blanking
S
U0
Line i
19 20
1/2 Line Interlace Offset
SAV, EAV Codes
Y0
0 0 0 0 0 0 0 0
Timing reference code
Field 1
Active Video
One Line
Preamble
Active Video
Line Scan @ 27 MHz = 13.5 Mpix/sec
V0
Y1
0 0 0 0 0 0 0 0
V = 1 during field blanking
E
One Frame
F = 0 during Field 1
F = 1 during Field 2
262 263
Blanking
U2
bits as part of the SAV and EAV codes as defined by
CCIR 656. There are 8 possible valid SAV and EAV
codes shown with their correct protection bits in
Table
codes and inserts them into the video out data stream
according to the CCIR 656 specification under all condi-
tions, whether it is generating or receiving horizontal and
frame timing information.
7.8.4
SAV and EAV codes are identified by a 3-byte preamble
of 0xFF, 0x00 and 0x00. This combination must be
PRODUCT SPECIFICATION
V = 0 elsewhere
7-2. The EVO generates SAV and EAV sync
Blanking
S
Y2
Video Clipping
1 F V H P P P P
Line i+1
Field 2
V2
Active Video
282
YUV 4:2:2 pixels
Active Video
Y3
H = 0 for SAV
H = 1 for EAV
Enhanced Video Out
Protection bits
(error correction)
U4
E
525 1
Y4
7-5