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GS3470 Datasheet(PDF) 62 Page - Semtech Corporation

Part # GS3470
Description  3G, HD, SD SDI Receiver
PDF  169 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS3470 Datasheet(HTML) 62 Page - Semtech Corporation

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GS3470
Final Data Sheet
Rev.8
PDS-060500
September 2017
62 of 169
Semtech
www.semtech.com
The GS3470 automatically extracts the SMPTE ST 352 payload identifier present in the
input data stream. For SD, HD, and 3G Level A, the bytes are written to
VIDEO_FORMAT_352_X_1. For 3G Level B, they are also written to
VIDEO_FORMAT_352_X_2.
The device also indicates the version of the payload packet in VERSION_352M (bit-7 of
byte 1) of the VIDEO_FORMAT_352_X_X register as per SMPTE 352M. When the SMPTE
ST 352 packet is formatted as a “version 1” packet, the VERSION_352M bit is set LOW,
when the packet is formatted as a “version 2” packet, this bit is set HIGH.
The VIDEO_FORMAT_352_X_1 and VIDEO_FORMAT_352_X_2 registers are only
updated if checksum errors are not present.
By default (at power up or after system reset), the VIDEO_FORMAT_352_X_1 and
VIDEO_FORMAT_352_X_2 bits are set to 0, indicating an undefined format.
4.17.2.1 Extension for UHD Multi-Link 3G Identification
UHD formats that are transported in multi-link 3G formats will have a link identifier
present in bits [7:4] of byte 4 of the 352M packet. This information is saved to 4 bits in
the VID_STD_DS[2:1] register.
Table 4-13: SMPTE ST 352 Packet Data
Bit Name
Bit
Name
Description
R/W
Default
VIDEO_FORMAT_352_A_[2:1]
Address: 828h, 82Ch
15:8
SMPTE ST 352
Byte 2
Data is available in this register when
Video Payload Identification Packets are
detected in the data stream.
R0
7:0
SMPTE ST 352
Byte 1
R0
VIDEO_FORMAT_352_B_[2:1]
Address: 829h, 82Dh
15:8
SMPTE ST 352
Byte 4
R0
7:0
SMPTE ST 352
Byte 3
R0
VIDEO_FORMAT_352_C_[2:1]
Address: 82Ah, 82Eh
15:8
SMPTE ST 352
Byte 2
R0
7:0
SMPTE ST 352
Byte 1
R0
VIDEO_FORMAT_352_D_[2:1]
Address: 82Bh, 82Fh
15:8
SMPTE ST 352
Byte 4
R0
7:0
SMPTE ST 352
Byte 3
R0



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