Video Port/VCXO Interpolated Control (VIC) Port User's Guide
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4.6.1 Raw Mode RGB Output Support
4.6.2 Raw Data FIFO Unpacking
Raw FIFO
VDOUT[9−2]
VCLKOUT
63 5655 4847 4039 32
Raw 5 Raw 4Raw 7 Raw 6
Raw 13 Raw 12Raw 15 Raw 14
Little-Endian Unpacking
31 2423 1615 8 7 0
Raw 1 Raw 0Raw 3 Raw 2
Raw 9 Raw 8Raw 11 Raw 10
Raw FIFO
VDOUT[19−12]/VDOUT[9−2]
VCLKOUT
63 4847 32
Raw 2Raw 3
Raw 6Raw 7
Little-Endian Unpacking
31 1615 0
Raw 0Raw 1
Raw 4Raw 5
Raw 10Raw 11 Raw 8Raw 9
Raw FIFO
VDOUT[9−2]
VCLKOUT
63 5655 4847 4039 32
Raw 8 (B2)
Raw 2 (B0)
Raw 7 (G2)
Little-Endian Unpacking
31 2423 1615 8 7 0
Raw 1 (G0) Raw 0 (R0)
Raw 6 (R2)Raw 11 (B3)
Raw 5 (B1)
Raw 10 (G3)
Raw 4 (G1) Raw 3 (R1)
Raw 9 (R3)
Raw Data Display Mode
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 α ) words in memory.
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 Figure 4-21 .
Figure 4-21. 8-Bit Raw FIFO Unpacking
Figure 4-22 shows the 16-bit raw mode. Samples are unpacked from each word of the FIFO.
Figure 4-22. 16-Bit Raw FIFO Unpacking
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 4-23 .
Figure 4-23. 8-Bit Raw FIFO Unpacking
SPRUEM1 – May 2007 Video Display Port 107
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