Datasheet

TVP7002
SLES206C –MAY 2007–REVISED APRIL 2013 www.ti.com
Embedded Syncs
Standard embedded syncs insert SAV and EAV codes into the data stream on the rising and falling edges of
AVID. These codes contain the V and F bits that also define vertical timing. Table 7 gives the format of the SAV
and EAV codes.
H = 1 always indicates EAV. H = 0 always indicates SAV. The alignment of V and F to the line and field counter
varies depending on the standard. The P bits are protection bits:
P3 = V xor H
P2 = F xor H
P1 = F xor V
P0 = F xor V xor H
Table 7. EAV and SAV Sequence
Y9 (MSB) Y8 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
Preamble 1 1 1 1 1 1 1 1 1 1
Preamble 0 0 0 0 0 0 0 0 0 0
Preamble 0 0 0 0 0 0 0 0 0 0
Status 1 F V H P3 P2 P1 P0 0 0
The pixel locations where SAV/EAV embedded sync codes are inserted can be programmed using the AVID
Start Pixel and AVID Stop Pixel I
2
C registers. The AVID start location is determined from the HSYNC interval,
horizontal back porch interval (H
bp
) and a digital process delay factor (P
DELAY
) required for compensation of
internal TVP7002 delays. An additional four bytes must be added to the active pixel interval between AVID start
and AVID stop to accommodate embedded sync insertion.
AVID Start Pixel = P
DELAY
+ HSYNC + H
bp
AVID Stop Pixel = AVID Start Pixel + Active Pixels + 4
NOTE
Some AVID Stop Pixel calculations will exceed the HPLL-Feedback Register setting, or
total pixels per line. When this occurs, subtract total pixels per line from AVID Stop Pixel.
NOTE
P
DELAY
is typically 27 pixels but may vary slightly depending on other TVP7002 settings
such as the Sync-on-Green Threshold setting (I
2
C register 10h) and the SOG LPF setting
(I
2
C register 1Ah).
The line numbers where the embedded V-bit and F-bit occur are controlled by I
2
C registers 44h to 49h, which
define the vertical blanking interval and field start positions. See Table 8 for typical embedded syncs settings.
Table 8. Typical Embedded Sync Settings
VBLK VBLK VBLK VBLK F-bit F-bit
Output
AVID Start Pixel AVID Stop Pixel Field 0 Field 1 Field O Field 1 Field 0 Field 1
Input Format Format
Start Line Start Line Duration Duration Start Line Start Line
REG 15h
REG 41h REG 40h REG 43h REG 42h REG 44h REG 45h REG 46h REG 47h REG 48h REG 49h
480i60Hz 47h 00h 95h 00h 0Fh 01h 01h 13h 13h 02h 01h
480p60Hz 47h 00h 93h 00h 0Dh 09h 09h 2Dh 2Dh 00h 00h
720p60Hz 47h 01h 47h 06h 4Bh 05h 05h 1Eh 1Eh 00h 00h
1080i60Hz 47h 01h 07h 08h 8Bh 02h 02h 16h 17h 00h 00h
1080p60Hz 47h 01h 07h 08h 8Bh 04h 04h 2Dh 2Dh 00h 00h
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