ADV7189B_15 datasheet(21/104 Pages) AD

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ADV7189B

Rev. B | Page 21 of 104

SYNC PROCESSING

The ADV7189B extracts syncs embedded in the video data

stream. There is currently no support for external HS/VS

inputs. The sync extraction has been optimized to support

imperfect video sources such as VCRs with head switches. The

actual algorithm used employs a coarse detection based on a

threshold crossing followed by a more detailed detection using

an adaptive interpolation algorithm. The raw sync information

is sent to a line-length measurement and prediction block. The

output of this is then used to drive the digital resampling

section to ensure that the ADV7189B outputs 720 active pixels

per line.

The sync processing on the ADV7189B also includes the

following specialized postprocessing blocks that filter and

condition the raw sync information retrieved from the

digitized analog video.

•

Vsync Processor. This block provides extra filtering of

the detected Vsyncs to give improved vertical lock.

•

Hsync Processor. The Hsync processor is designed to filter

incoming Hsyncs that are corrupted by noise, providing

much improved performance for video signals with stable

time base but poor SNR.

VBI DATA RECOVERY

The ADV7189B can retrieve the following information from

the input video:

•

Wide-screen signaling (WSS)

•

Copy generation management system (CGMS)

•

Closed captioning (CC)

•

Macrovision protection presence

•

EDTV data

•

Gemstar-compatible data slicing

The ADV7189B is also capable of automatically detecting

the incoming video standard with respect to

•

Color subcarrier frequency

•

Field rate

•

Line rate

The ADV7189B can configure itself to support PAL-BGHID,

PAL-M/N, PAL-combination N, NTSC-M, NTSC-J, SECAM

50 Hz/60 Hz, NTSC4.43, and PAL60.

GENERAL SETUP

Video Standard Selection

The VID_SEL[3:0] register allows the user to force the digital

core into a specific video standard. Under normal circumstances,

this should not be necessary. The VID_SEL[3:0] bits default to

an autodetection mode that supports PAL, NTSC, SECAM, and

variants thereof. The following section provides more informa-

tion on the autodetection system.

Autodetection of SD Modes

To guide the autodetect system of the ADV7189B, individ-

ual enable bits are provided for each of the supported video

standards. Setting the relevant bit to 0 inhibits the standard

from being detected automatically. Instead, the system picks

the closest of the remaining enabled standards. The results of

the autodetection can be read back via the status registers. See

the

168H

Global Status Registers section for more information.

VID_SEL[3:0] Address 0x00[7:4]

Table 18. VID_SEL Function

VID_SEL[3:0]

Description

0000 (default)

Autodetect (PAL BGHID) <–> NTSC J (no

pedestal), SECAM.

0001

Autodetect (PAL BGHID) <–> NTSC M

(pedestal), SECAM.

0010

Autodetect (PAL N) (pedestal) <–> NTSC J (no

pedestal), SECAM.

0011

Autodetect (PAL N) (pedestal) <–> NTSC M

(pedestal), SECAM.

0100

NTSC J (1).

0101

NTSC M (1).

0110

PAL 60.

0111

NTSC 4.43 (1).

1000

PAL BGHID.

1001

PAL N[= PAL BGHID (with pedestal)].

1010

PAL M (without pedestal).

1011

PAL M.

1100

PAL Combination N.

1101

PAL Combination N (with pedestal).

1110

SECAM.

1111

SECAM (with pedestal).

AD_SEC525_EN Enable Autodetection of SECAM 525

Line Video, Address 0x07[7]

Setting AD_SEC525_EN to 0 (default), disables the

autodetection of a 525-line system with a SECAM style,

FM-modulated color component.

Setting AD_SEC525_EN to 1 enables the detection.

AD_SECAM_EN Enable Autodetection of SECAM,

Address 0x07[6]

Setting AD_SECAM_EN to 0 disables the autodetection of

SECAM.

Setting AD_SECAM_EN to 1 (default) enables the detection.

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