![](http://datasheet.mmic.net.cn/390000/TSB42AA4I_datasheet_16839080/TSB42AA4I_86.png)
521
default, the value of these registers is 0x0000 0000. All other bytes of the inserted H0 DIF block header are
0xFF.
ceLynx automatically increments the ID0 DIF sequence number when the H0 block is automatically inserted.
This sequence number is updated with every new sequence. The sequence counter is incremented every
25
th
packet. It rolls over when it reaches its maximum count, which is 9 (NTSC) and 11 (PAL). The next frame
begins with the ID0 counter at zero.
Byte Position
H0
FF_FF_FF_
H0R3
H0R4
H0R5
H0R6
H0R7
ID0
ID1
ID2
ID
FF
0 1 2 3
79
7 8
Figure 523. H0 DIF Block Header for DV Transmit
When transmitting DV data in the header0 insert mode, ceLynx is not capable of resetting the ID1 DIF
sequence number to 0 when the source stops and resumes its data transmission in the middle of the frame.
The DIF sequence number starts its counter from the value conserved when the data source stops. As a
result, ceLynx inserts the time stamp where the DIF sequence is offset. Use the following steps to correctly
transmit DV data in the header0 insert mode.
1.
2.
3.
4.
Source turned off within a frame.
Wait until the TX buffer signals an empty.
Reset the TXDP.
Resume data transmission with a new frame.
5.5.3.1
HDDV (618833)
ceLynx supports HDDV data in minimal form. ceLynx supports a H
0,0
and H
0,1
insertion mode. This mode
is a simple derivative of the H
0
insertion mode. The H
0
data is inserted into both the H
0,0
and H
0,1
data
locations. The customer has the option of disabling this feature.
ceLynx supports the extended data length as defined by 61883-3 for HD-DVCR data. Both PAL and NTSC
systems are supported. Time stamping is supported as it is for the standard DV modes.
The burst DV algorithm is not supported for this data type. No hardware smoothing function inserts empty
packets. Empty packets are only inserted when a complete packet is not available in the buffer.
ceLynx also supports H0 DIF block insertion for HD-DVCR format. It inserts a 160-byte H0 DIF block. The
first eight bytes of the H0 DIF block can be programmed by the host port in internal registers TXDP(N)H3
and TXDP(N)H4. The rest of the 160-byte header are all 0xFF. The ID0 sequence number is also
automatically incremented for every new sequence whenever ceLynx automatically inserts the H0 DIF block
header.
HDDV has been verified in design simulation only.
5.5.3.2
DV Format (IEC 61883-2) Burst Input
A burst input is defined as an input method that is limited only by the fullness of the transmit buffer. This
method is commonly used when the application level hardware or software does not know how fast to input