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| 型號： | GS9090-CNE3 |
| 廠商： | Gennum Corporation |
| 英文描述： | GS9090 GenLINX-R III 270Mb/s Deserializer for SDI and DVB-ASI |
| 中文描述： | GS9090 GenLINX - R的第三270Mb / s的SDI和DVB解串器，意大利航天局 |
| 文件頁數(shù)： | 37/70頁 |
| 文件大小： | 696K |
| 代理商： | GS9090-CNE3 |
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GS9090 Data Sheet
28201 - 1
July 2005
37 of 70
3.9.6 Automatic Video Standard and Data Format Detection
The GS9090 can independently detect the input video standard and data format by
using the timing parameters extracted from the received TRS ID words. Total
samples per line, active samples per line, total lines per field/frame, and active lines
per field/frame are all calculated and presented to the host interface via the
RASTER_STRUCTURE registers (
Table 3-9
).
Also associated with the RASTER_STRUCTURE registers is the status bit,
STD_LOCK. The GS9090 will set STD_LOCK HIGH when the flywheel has
achieved full synchronization to the received video standard. STD_LOCK is stored
in the DATA_FORMAT register (
Table 3-7
).
The four RASTER_STRUCTURE registers, as well as the STD_LOCK status bit
will default to zero after a device reset. They will also default to zero if the device
loses lock to the input data stream (LOCKED = LOW), or if the SMPTE_BYPASS
pin is asserted LOW.
Table 3-8: Host Interface Description for SMPTE 352M Payload Identifier Registers
Register Name
Bit
Name
Description
R/W
Default
VIDEO_FORMAT_OUT_B
Address: 10h
15-8
SMPTE 352M Byte 4
Data will be available in this register when
Video Payload Identification Packets are
detected in the data stream.
R
0
7-0
SMPTE 352M Byte 3
Data will be available in this register when
Video Payload Identification Packets are
detected in the data stream.
R
0
VIDEO_FORMAT_OUT_A
Address: 0Fh
15-8
SMPTE 352M Byte 2
Data will be available in this register when
Video Payload Identification Packets are
detected in the data stream.
R
0
7-0
SMPTE 352M Byte 1
Data will be available in this register when
Video Payload Identification Packets are
detected in the data stream.
R
0
Table 3-9: Host Interface Description for Raster Structure Registers
Register Name
Bit
Name
Description
R/W
Default
RASTER_STRUCTURE1
Address: 11h
15-11
–
Not Used
–
–
10-0
RASTER_STRUCTURE1[10:0]
Total Lines Per Frame
R
0
RASTER_STRUCTURE2
Address: 12h
15-13
–
Not Used
–
–
12-0
RASTER_STRUCTURE2[12:0]
Total Words Per Line
R
0
RASTER_STRUCTURE3
Address: 13h
15-13
–
Not Used
–
–
12-0
RASTER_STRUCTURE3[12:0]
Words Per Active Line
R
0
RASTER_STRUCTURE4
Address: 14h
15-11
–
Not Used
–
–
10-0
RASTER_STRUCTURE4[10:0]
Active Lines Per Field
R
0
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