GS1672 datasheet(32/116 Pages) SEMTECH

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GS1672 HD/SD-SDI Serializer with Complete SMPTE

Audio & Video Support

Data Sheet

53623 - 6

July 2011

32 of 116

NOTE:

I/O processing must be enabled for the device to remap 8-bit TRS words to the

corresponding 10-bit value for transmission.

The GS1672 determines the video standard by timing the horizontal and vertical

reference information supplied at the H/HSYNC, V/VSYNC, and F/DE input pins, or

contained in the TRS ID words of the received video data. Therefore, full

synchronization to the received video standard requires at least one complete video

frame.

Once synchronization has been achieved, the GS1672 will continue to monitor the

received TRS timing or the supplied H, V, and F timing information to maintain

synchronization. The GS1672 will lose all timing information immediately following loss

of H, V and F.

The H signal timing should also be configured via the H_CONFIG bit of the internal

IOPROC register as either active line based blanking or TRS based blanking.

Active line based blanking is enabled when the H_CONFIG bit is set LOW. In this mode,

the H input should be HIGH for the entire horizontal blanking period, including the EAV

and SAV TRS words. This is the default H timing used by the device.

The timing of these signals is shown in Figure 4-2, Figure 4-3, Figure 4-4 and Figure 4-5.

Figure 4-2: H:V:F Input Timing - HD 20-bit Input Mode

Figure 4-3: H:V:F Input Timing - HD 10-bit Input Mode

Figure 4-4: H:V:F Input Timing - SD 20-bit Mode

P C LK

L U M A D A T A IN P U T

C HR OM A DA T A IN P U T

X Y Z (EAV)

000

00 0

3F F

000

00 0

3F F

000

00 0

3FF

000

00 0

3FF

X Y Z (EAV)

X Y Z (SAV)

H S I G NAL T IM IN G :

H_ C ONF IG = L O W

H _ C ONF IG = H I G H

HV F T IM IN G

AT S AV

000

00 0

3FF

3F F

00 0

000

P C LK

M U L T IP L E XED Y'Cb C r D A T A IN P U T

HV F T IM IN G

AT EAV

P C LK

00 0

000

3FF

3F F

X Y Z (EAV)

000

00 0

M U L T IP L E XED Y'Cb C r D A T A IN P U T

X Y Z (EAV)

XY Z (SAV) X Y Z (SAV)

P C LK

C H R O M A D A T A IN PU T

LU M A D A T A I N P U T

000

3F F

X Y Z (EAV)

000

3FF

00 0

H S I G NAL T IM IN G :

H_ C ONF IG = L O W

H _ C ONF IG = H I G H

X Y Z (SAV)

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