Pro-Video Transport Interfaces
Serial Data Transport Interface (SDTI)
SMPTE 305M and ITU-R BT.1381 define a Serial Data Transport Interface (SDTI) that enables transferring data between equipment. The physical layer uses the 270 or 360 Mbps BT.656, BT.1302, and SMPTE 259M digital component video serial interface. Figure 4.31 illustrates the signal format.
Figure 4.31. SDTI Signal Format.
A 53-word header is inserted immediately after the EAV sequence, specifying the source, destination, and data format. Table 4.30 illustrates the header contents.
Table 4.30. DVI-D Connector Signal Assignments
| Pin | Signal | Pin | Signal | Pin | Signal |
|---|---|---|---|---|---|
| 1 | D2− | 9 | D1− | 17 | D0− |
| 2 | D2 | 10 | D1 | 18 | D0 |
| 3 | shield | 11 | shield | 19 | shield |
| 4 | D4− | 12 | D3− | 20 | D5− |
| 5 | D4 | 13 | D3 | 21 | D5 |
| 6 | DDC SCL | 14 | +5V | 22 | shield |
| 7 | DDC SDA | 15 | ground | 23 | CLK |
| 8 | reserved | 16 | Hot Plug Detect | 24 | CLK− |
The payload data is defined within BT.1381 and by other application-specific standards such as SMPTE 326M. It may consist
of MPEG-2 program or transport streams, DV streams, etc., and uses either 8-bit words plus even parity and 
, or 9-bit words plus .
High Data-Rate Serial Data Transport Interface (HD-SDTI)
SMPTE 348M and ITU-R BT.1577 define a High Data-Rate Serial Data Transport Interface (HD-SDTI) that enables transferring data between equipment. The physical layer uses the 1.485 (or 1.485/1.001) Gbps SMPTE 292M digital component video serial interface.
Figure 4.32 illustrates the signal format. Two data channels are multiplexed onto the single HD-SDTI stream such that one 74.25 (or 74.25/1.001) MHz data stream occupies the Y data space and the other 74.25 (or 74.25/1.001) MHz data stream occupies the CbCr data space.
Figure 4.32. HD-SDTI Signal Format. LN=line number (two 10-bit words), CRC=line number CRC (two 10-bit words).
A 49-word header is inserted immediately after the line number CRC data, specifying the source, destination, and data format.
The payload data is defined by other application-specific standards. It may consist of MPEG-2 program or transport streams,
DV streams, etc., and uses either 8-bit words plus even parity and , or 9-bit words plus .