Altera Serial Digital Interface (SDI) MegaCore Function - Manual (Page 39)

Chapter 3: Functional Description 3–9
Block Description
February 2013 Altera Corporation Serial Digital Interface (SDI) MegaCore Function
User Guide
Video Timing Flags Extraction
The TRS match module extracts the F, V, and H video timing flags from the received
data. You can use these flags for receiver format detection, or in the implementation of
a flywheel function.
The TRS match module also identifies the line number and CRC words for HD-SDI.
RP168 Switching Compliance
To meet the RP168 requirements, the transceiver must be able to recover by the end of
the switching line.
Table 3–4 lists the supported video switching type.
f
For more information about the switching line and time for different video formats,
refer to RP168.
Figure 3–5 and Figure 3–6 show the behaviors of the aligner and format blocks during
the RP168 switching.
The aligner block immediately aligns to the next TRS timing based on the user input
en_sync_switch
signal.
Table 3–4. Supported Video Switching Type
Standard/ Data Rate Format RP168 Support Switching Source
Fixed Switch (same format) Yes HD-1080i30 to HD-1080i30
Fixed Switch No HD-1080 to HD-720
Switch Fixed No HD-1080 to SD-525
Switch Switch No HD-1080 to SD-525
Figure 3–5. Aligner Block Behavior
Notes to Figure 3–5 :
(1) Mismatch in alignment.
(2) New alignment on the next TRS.
(3) Data aligned to new alignment.
(4) Zero interrupt.
tx_data
dead_time
(1)
switch
line
10200
10200
00000H
00000H
40020H 10200H
10200H 10200H
10200H
10200H
10200H
10200H
10200H
10200H
10 11 12
12H 03H alignment
align_locked/rx_status[2]
rx_data
(2)
(2)
(4)
(3)