Table 4-5: Host Interface Description for Programmable Ancillary Data Type Registers (Continued)
Register Name
Bit
Name
Description
R/W
Default
ANC_TYPE4
Address: 008h
15-8
ANC_TYPE4[15:8]
Used to program the DID for ancillary data
detection at the YANC and CANC output
R/W
0
7-0
ANC_TYPE4[7:0]
Used to program the SDID for ancillary data
detection at the YANC and CANC output.
R/W
0
Should be set to zero if no SDID is present in the
ancillary data packet to be detected.
ANC_TYPE5
Address: 009h
15-8
7-0
ANC_TYPE5[15:8]
ANC_TYPE5[7:0]
Used to program the DID for ancillary data
detection at the YANC and CANC output
R/W
R/W
0
0
Used to program the SDID for ancillary data
detection at the YANC and CANC output.
Should be set to zero if no SDID is present in the
ancillary data packet to be detected.
4.10.3 SMPTE 352M Payload Identifier
The GS1559 can receive and detect the presence of the SMPTE 352M Payload Identifier
Ancillary Data Packet. This four word Payload Identifier Packet may be used to indicate
the transport mechanism, frame rate and line scanning/sampling structure.
Upon reception of this packet, the device will extract the four words describing the
video format being transported and make this information available to the Host
Interface via the four VIDEO_FORMAT_OUT registers (Table 4-6).
The VIDEO_FORMAT_OUT registers will only be updated if the received checksum is
the same as the locally calculated checksum.
These registers will be cleared to zero, indicating an undefined format, if the device loses
lock to the input data stream (LOCKED = LOW), or if the SMPTE_BYPASS pin is asserted
LOW. This is also the default setting after device reset.
The SMPTE 352M packet should be received once per field for interlaced systems and
once per frame for progressive systems. If the packet is not received for two complete
video frames, the VIDEO_FORMAT_OUT registers will be cleared to zero.
GS1559 HD-LINX™ II Multi-Rate Deserializer with
Loop-Through Cable Driver
Data Sheet
43 of 71
30572 - 8
July 2008
GENNUM [ GENNUM CORPORATION ]
