GS9062-CFE3 datasheet(26/46 Pages) GENNUM

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GS9062 Data Sheet

22209 - 7

February 2007

26 of 46

3.5 Data-Through Mode

The GS9062 may be configured by the application layer to operate as a simple

parallel-to-serial converter. In this mode, the device presents data to the output

buffer without performing any scrambling or encoding.

Data-through mode is enabled only when both the SMPTE_BYPASS and

DVB_ASI pins are set LOW.

3.6 Additional Processing Functions

The GS9062 contains an additional data processing block which is available in

SMPTE mode only, SMPTE Mode on page 23.

3.6.1 Input Data Blank

The video input data may be 'blanked' by the GS9062. In this mode, all input video

data except TRS words are set to the appropriate blanking levels by the device.

Both the horizontal and vertical ancillary data spaces will also be set to blanking

levels.

This function is enabled by setting the BLANK pin LOW.

3.6.2 Automatic Video Standard Detection

The GS9062 can detect the input video standard by using the timing parameters

extracted from the received TRS ID words or supplied H, V, and F timing signals

Internal Flywheel on page 23. This information is presented to the host interface

via the VIDEO_STANDARD register (Table 3-2).

Total samples per line, active samples per line, total lines per field/frame and active

lines per field/frame are also calculated and presented to the host interface via the

RASTER_STRUCTURE registers (Table 3-3). These line and sample count

registers are updated once per frame at the end of line 12. This is in addition to the

information contained in the VIDEO_STANDARD register.

After device reset, the four RASTER_STRUCTURE registers default to zero.

Table 3-2: Host Interface Description for Video Standard Register

Bit

Name

Description

R/W

Default

VIDEO_STANDARD

Address: 04h

Not Used

14–10

VD_STD[4:0]

Video Data Standard (see Table 3-4)R

Not Used

STD_LOCK

Standard Lock: Set HIGH when flywheel has

achieved full synchronization.

7–0

Not Used

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