Video Port/VCXO Interpolated Control (VIC) Port User's Guide
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Cr 1
Cr 9
Cb 1
Cb 9
Y 1
Y 9
Y 17
Y 25
Cr 2
Cr FIFO
Little-Endian Packing
Cr 6
Cr 14
Cb 6
Cb 14
Y 6
Y 14
Y 22
Y 30
Cb 0
Y 23
Cr 7
Cr 15
63
Cb 7
Cb 15
63
Y 7
Y 15
Cb FIFO
Y FIFO
5556
5556
Y 31
63
VCLKINA / VCLKINB
VDIN[9−2] / VDIN[9−12]
5556
Cr 4
Cr 12
Cb 4
Cb 12
Y 4
Y 12
Y 20
Y 28
Y 2
Y 21
Cr 5
Cr 13
Cb 5
Cb 13
Y 5
Y 13
48 47
48 47
3940
40 39
Y 29
Cr 0Y 0
48 47
Cb 1
40 39
Y 1
Y 18Y 19
Cr 2
Cr 10
23
Cb 2
Cb 10
23
Y 2
Y 10
Cb 11
Cr 3
Cr 11
Cb 3
3132 24
Y 3
Y 11
3132 24
1516
1516
Y 26
23
Y 3
Y 27
Cr 1
3132
24
Y 4Cb 2
1516
Y 16
Cr 0
Cr 8
Cb 0
Cb 8
Y 0
Y 8
8 7
8 7
0
0
Y 24
Y 5
8 7 0
3.3 Y/C Video Capture Mode
3.3.1 Y/C Capture Channels
3.3.2 Y/C Timing Reference Codes
3.3.3 Y/C Image Window and Capture
Y/C Video Capture Mode
Figure 3-2. 8-Bit BT.656 FIFO Packing
The Y/C capture mode is similar to the BT.656 capture mode but captures 8-bit 4:2:2 data on separate
luma and chroma data streams. One data stream contains Y samples and the other stream contains
multiplexed Cb and Cr samples co-sited with every other Y sample. The Y samples are written into a Y
FIFO and the chroma samples are de-multiplexed and written into separate Cb and Cr FIFOs for transfer
into Y, Cb, and Cr buffers in DSP memory.
The Y/C capture mode supports HDTV standards such as SMPTE260, SMPTE296, and BT.1120 with
embedded EAV and SAV codes. It also supports SDTV YCbCr modes that use separate control signals
(sometimes called CCIR601 mode)
As with the BT.656 capture mode, data bytes where the 8 most-significant bits are all set to 1 (FFh) or are
all cleared to 0 (00h) are reserved for data identification purposes and consequentially only 254 of the
possible 256 8-bit words may be used to express signal value.
Because Y/C mode requires the entire VDATA bus, only single channel operation is supported. If the
DCHDIS bit in VPCTL is set, then Y/C mode cannot be selected. Y/C capture takes place on channel A
only. Both embedded timing references and external control inputs are supported.
Many high-resolution Y/C interface standards provide for embedded timing reference codes. These codes
are identical to those used in the BT.656 standard except that they appear on both the luma (Y) and
chroma (CbCr) data streams in parallel.
The SDTV Y/C format (CCIR601) is an interlaced format consisting of two fields just like BT.656. HDTV
Y/C formats may be interlaced or progressive scan. For interlaced capture, the capture windows are
programmed identically to BT.656 mode. For progressive scan formats, only field1 is used.
In Y/C mode, HCOUNT increments on every luma sample period (every VCLKINA rising edge) for which
capture is enabled. Once YCOUNT = YSTART, line capture begins when HCOUNT = XSTART. It
continues until HCOUNT = XSTOP. A field's capture is complete when HCOUNT = VCXSTOP and
VCOUNT = VCYSTOP.
50 Video Capture Port SPRUEM1 – May 2007
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