GS9091B Datasheet, PDF (41/71 Pages) Gennum Corporation – GenLINX II 270Mb/s Deserializer for SDI and DVB-ASI

3.9.6.1 Data Format Indication
The GS9091B can extract the data format being carried on the serial digital interface (i.e.
SDTI, SDI, or DVB-ASI). This information is represented by bits 0 to 3 of the
DATA_FORMAT register (Table 3-7).
DATA_FORMAT[3:0] register codes are shown in Table 3-10.
The DATA_FORMAT[3:0] register defaults to Fh (undefined) after a system reset. The
register will also be set to its default value if the device is not locked (LOCKED = LOW),
or if both SMPTE_BYPASS and DVB_ASI pins are LOW.
Table 3-10: Data Format Register Codes
Data Format[3:0]
0h
1h
2h
3h
4h
5h
6h
7h
8h ~ Eh
Fh
Data Format
Applicable Standards
SDTI DVCPRO - No ECC
SDTI DVCPRO - ECC
SDTI DVCAM
SDTI CP
Other SDTI fixed block size
Other SDTI variable block size
SDI
DVB-ASI
Reserved
Unknown data format
SMPTE 321M
SMPTE 321M
SMPTE 322M
SMPTE 326M
–
–
–
–
–
–
3.9.7 Error Detection and Indication
The GS9091B contains a number of error detection functions to enhance operation of
the device when operating in SMPTE mode. These functions, except lock error detection,
will not be available in DVB-ASI mode (Section 3.7) or Data-Through mode (Section 3.8).
The ERROR_STATUS register is at address 01h (Table 3-11). All bits, except the
LOCK_ERR bit, will be cleared at the start of each video field or when read by the host
interface, whichever condition occurs first.
All bits, with the exception of the LOCK_ERR, will also be cleared if a change in the video
standard is detected, if the device loses lock to the input data stream (LOCKED = LOW),
or if the SMPTE_BYPASS pin is asserted LOW.
The ERROR_STATUS register, including the LOCK_ERR bit, will be set LOW during a
system reset (RESET = LOW).
GS9091B GenLINX® II 270Mb/s Deserializer for SDI
and DVB-ASI
Data Sheet
38910 - 2
July 2008
41 of 71
Proprietary & Confidential