Interpolated Control (VIC) Port Reference Guide

Capture Line Boundary Conditions
3-43Video Capture PortSPRU629
In Figure 3–28 (8-bit Y/C mode), the line length is not a doubleword. When the
condition HCOUNT = VCXSTOP occurs, the FIFO location is written even
though 8 bytes have not been received. The next capture line then begins in
the next FIFO location at byte 0. This operation extends to all capture modes.
In the case of TSI and raw data modes, there are no lines. In these modes, a
final write at the end of the packet must be performed when the packet data
count equals the 24-bit combined value of VCXCOUNT and VCYCOUNT.
Figure 3–28. Capture Line Boundary Example
Y FIFO
Cb FIFO
Y 74 Y 76 YDEFY73 Y 75 Y 77 YDEF
VDOUT[9–2]
VCLKOUT
63 56 55 48 47 4039 32
Y 5
Y 4
Y 7 Y 6
Y 69 Y 68
Y 71 Y 70
Y 77 Y 76
Cb 37 Cb 36
Cb 38
Little-Endian Packing
YDEF YDEFYDEF YDEF
Cb 36 Cb 37 Cb 38 CbDEFCr 36 Cr 37 Cr 38 CrDEF
VDOUT[19–12]
CbDEF CbDEFCrDEF CrDEF
Y 72
31 2423 16 15 8 7 0
Y 1
Y 0Y 3 Y 2
Y 65 Y 64Y 67 Y 66
Y 73 Y 72Y 75 Y 74
31 24
23 1615 87 0
Cb 33 Cb 32Cb 35 Cb 34
63 56 55 48 47 4039 32
IPCOUNT = IMGHSIZE(78)
Cb 5 Cb 4
Cb 7 Cb 6
Cb 1 Cb 0Cb 3 Cb 2
Cr FIFO
Cr 37 Cr 36
Cr 38
31 24 23 1615 8 7 0
Cr 33 Cr 32Cr 35 Cr 34
63 56 55 48 47 4039 32
Cr 5 Cr 4
Cr 7 Cr 6
Cr 1 Cr 0Cr 3 Cr 2
Y FIFO
Cb FIFO
63 56 55 48 47 4039 32
Y 5Y 4 Y 7Y 6
Y 69Y 68 Y 71Y 70
Y 77Y 76
Cb 37Cb 36 Cb 38
Big-Endian Packing
31 2423 16 15 8 7 0
Y 1Y 0
Y 3Y 2
Y 65Y 64
Y 67Y 66
Y 73Y 72
Y 75Y 74
31 24 23 1615 8 7 0
Cb 33Cb 32
Cb 35Cb 34
63 56 55 48 47 4039 32
Cb 5Cb 4 Cb 7Cb 6
Cb 1Cb 0
Cb 3Cb 2
Cr FIFO
31 24 23 1615 8 7 063 56 55 48 47 4039 32
Cr 37Cr 36 Cr 38
Cr 33Cr 32
Cr 35Cr 34
Cr 5Cr 4 Cr 7Cr 6
Cr 1Cr 0
Cr 3Cr 2
Line n
Line n+1
Line n
Line n+1
Line n
Line n+1
Line n
Line n+1
Line n
Line n+1
Line n
Line n+1