GS1559-CBE2 Gennum Corp., GS1559-CBE2 Datasheet - Page 47

• Manufacturer Part Number: GS1559-CBE2
• Description: HD-LINX II Multi-Rate Deserializer with Loop-Through Cable Driver
• Manufacturer: Gennum Corp.

4.10.3 SMPTE 352M Payload Identifier
Table 4-6: Host Interface Description for SMPTE 352M Payload Identifier Registers
4.10.4 Automatic Video Standard and Data Format Detection
Register Name
VIDEO_FORMAT_OUT_B
Address: 00Dh
VIDEO_FORMAT_OUT_A
Address: 00Ch
Bit
15-8
7-0
15-8
7-0
The GS1559 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
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.
The GS1559 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
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
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.
Proprietary and Confidential
Name
SMPTE352M
Byte 4
SMPTE352M
Byte 3
SMPTE352M
Byte 2
SMPTE352M
Byte 1
4-7).
Description
Data will be available in this register when Video
Payload Identification Packets are detected in the
data stream.
Data will be available in this register when Video
Payload Identification Packets are detected in the
data stream.
Data will be available in this register when Video
Payload Identification Packets are detected in the
data stream.
Data will be available in this register when Video
Payload Identification Packets are detected in the
data stream.
30572 - 1
(Table
GS1559 Preliminary Data Sheet
4-8). These line and sample count
November 2004
(Table
4-6).
R/W
R
R
R
R
Default
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0
0
0
0