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4.6.1 Raw Mode RGB Output Support
The raw data display mode has a special pixel count feature that allows the FPCOUNT increment rate to
be set. FPCOUNT increments only when INCPIX samples have been sent out. This option allows proper
tracking of the display pixels when sending out sequential RGB samples. (INCPIX would be set to three in
this case, to indicate that a single pixel is represented by three output samples.)
Sequential RGB samples output are also supported through a special FIFO unpacking mode. When the
8-bit raw 3/4 unpacking is selected (RGBX bit in VDCTL), three output bytes are selected from each word
and the fourth byte is ignored. This allows the video port to correctly output data formatted as 24-bit RGB
(or RGB ) words in memory.
4.6.2 Raw Data FIFO Unpacking
Display data is always packed into the FIFOs in 64-bit words and must be unpacked before being sent to
the display data pipeline. By default, data is unpacked from right to left .
The 8-bit raw mode uses a single data FIFO. Samples are unpacked as shown in
VCLKOUT
VDOUT[9−2]
63
Raw 15
Raw 7
Raw FIFO
Figure 4-22
shows the 16-bit raw mode. Samples are unpacked from each word of the FIFO.
VCLKOUT
VDOUT[19−12]/VDOUT[9−2]
63
Raw 11
Raw 7
Raw 3
Raw FIFO
In 8-bit raw 3/4 mode, three samples are unpacked from the FIFO and the remaining byte is ignored. This
is shown in
Figure
VCLKOUT
VDOUT[9−2]
63
Raw FIFO
SPRUEM1 – May 2007
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Figure 4-21. 8-Bit Raw FIFO Unpacking
Raw 0
Raw 1
Raw 2
5655
4847
4039
Raw 14
Raw 13
Raw 6
Raw 5
Figure 4-22. 16-Bit Raw FIFO Unpacking
Raw 0
Raw 1
Raw 2
Raw 3
4847
Raw 10
Raw 6
Raw 2
4-23.
Figure 4-23. 8-Bit Raw FIFO Unpacking
Raw 0
Raw 1
Raw 2
(R0)
(G0)
(B0)
5655
4847
4039
Raw 11 (B3)
Raw 10 (G3)
Raw 5 (B1)
Raw 4 (G1)
Raw 3
Raw 4
Raw 5
Raw 6
Raw 7
32
31
2423
Raw 12
Raw 11
Raw 10
Raw 4
Raw 3
Raw 2
Little-Endian Unpacking
Raw 4
Raw 5
Raw 6
Raw 7
32
31
Raw 9
Raw 5
Raw 1
Little-Endian Unpacking
Raw 3
Raw 4
Raw 5
Raw 6
Raw 7
(R1)
(G1)
(B1)
(R2)
(G2)
32
31
2423
Raw 9 (R3)
Raw 8 (B2)
Raw 3 (R1)
Raw 2 (B0)
Little-Endian Unpacking
Raw Data Display Mode
Figure
4-21.
Raw 8
Raw 9
Raw 10
Raw 11
1615
8 7
Raw 9
Raw 8
Raw 1
Raw 0
Raw 8
Raw 9
Raw 10
Raw 11
1615
Raw 8
Raw 4
Raw 0
Raw 8
Raw 9
Raw 10
Raw 11
(B2)
(R3)
(G3)
(B3)
1615
8 7
Raw 7 (G2)
Raw 6 (R2)
Raw 1 (G0)
Raw 0 (R0)
Video Display Port
0
0
0
107
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