GS9060 datasheet(39/61 Pages) GENNUM

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GS9060 Data Sheet

22208 - 8

January 2007

39 of 61

3.10.3 SMPTE 352M Payload Identifier

The GS9060 can receive and detect the presence of the SMPTE 352M payload

identifier ancillary data packet. This four word payload identifier packet may be

used to indicate the transport mechanism, frame rate and line scanning / sampling

structure.

Upon reception of this packet, the device will extract the four words describing the

video format being transported and make this information available to the host

interface via the four VIDEO_FORMAT_OUT registers (Table 3-5).

The VIDEO_FORMAT_OUT registers will only be updated if the received

checksum is the same as the locally calculated checksum.

These registers will be cleared to zero, indicating an undefined format, if the device

loses lock to the input data stream (LOCKED = LOW), or if the SMPTE_BYPASS

pin is asserted LOW. This is also the default setting after device reset.

The SMPTE 352M packet should be received once per field for interlaced systems

and once per frame for progressive systems. If the packet is not received for two

complete video frames, the VIDEO_FORMAT_OUT registers will be cleared to

zero.

3.10.4 Automatic Video Standard and Data Format Detection

The GS9060 can independently detect the input video standard and data format by

using the timing parameters extracted from the received TRS ID words. This

information is presented to the host interface via the VIDEO_STANDARD register

(Table 3-6).

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 3-7). 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 3-5: Host Interface Description for SMPTE 352M Payload Identifier Registers

Bit

Name

Description

R/W

Default

VIDEO_FORMAT_OUT_B

Address: 0Dh

15-8

SMPTE352M

Byte 4

Data will be available in this register when Video

Payload Identification Packets are detected in the

data stream.

7-0

SMPTE352M

Byte 3

Data will be available in this register when Video

Payload Identification Packets are detected in the

data stream.

VIDEO_FORMAT_OUT_A

Address: 0Ch

15-8

SMPTE352M

Byte 2

Data will be available in this register when Video

Payload Identification Packets are detected in the

data stream.

7-0

SMPTE352M

Byte 1

Data will be available in this register when Video

Payload Identification Packets are detected in the

data stream.

GS9060 Datasheet(PDF) 39 Page - Gennum Corporation

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