GS9090A_10 Datasheet, PDF (39/73 Pages) Gennum Corporation – GenLINX III 270Mb/s Deserializer

3.9.6.1 Video Standard Indication
As well as detecting the video standard, the GS9090A 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),
which may be read via the host interface. 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 GS9090A 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 (DVB-ASI Functionality on page 29) or
Data-Through mode (Data-Through functionality on page 30).
The device maintains an error status register at address 01h called ERROR_STATUS.
Each type of error has a specific flag or bit in this register that is set HIGH whenever that
error is detected (Table 3-11).
All bits in the ERROR_STATUS register, 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, or under the following conditions:
• LOCKED is asserted LOW
• SMPTE_BYPASS is asserted LOW in Manual mode
GS9090A GenLINX® III 270Mb/s Deserializer
Data Sheet
34714 - 7
May 2010
39 of 73