GS1559 Gennum Corp., GS1559 Datasheet - Page 47

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

Table 4-6: Host Interface Description for SMPTE 352M Payload Identifier Registers
4.10.4 Automatic Video Standard and Data Format Detection
4.10.4.1 Video Standard Indication
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 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.
The video standard codes reported in the VD_STD[4:0] bits of the
VIDEO_STANDARD register represent the SMPTE standards as shown in
Table
In addition to the 5-bit video standard code word, the VIDEO_STANDARD register
also contains two status bits. The STD_LOCK bit will be set HIGH whenever the
flywheel has achieved full synchronization. The INT_PROG bit will be set LOW if
the detected video standard is progressive and HIGH if the detected video
standard is interlaced.
The VD_STD[4:0], STD_LOCK and INT_PROG bits of the VIDEO_STANDARD
register will default to zero after device reset. The VD_STD[4:0] and INT_PROG
bits 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. The
STD_LOCK bit will retain its previous value if the input is removed.
30572 - 4
Name
SMPTE352M
Byte 4
SMPTE352M
Byte 3
SMPTE352M
Byte 2
SMPTE352M
Byte 1
4-9.
4-7).
July 2005
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.
(Table
4-8). These line and sample count
GS1559 Data Sheet
R/W
R
R
R
R
Default
47 of 74
0
0
0
0