ADV8003 Hardware Manual
Rev. B, August 2013
159
Sharp/Smooth
Both the sharp/smooth options for scaler interpolation are versions of the proprietary ADI algorithm. The sharp and smooth versions
allow for limited customization of the scaler function. This function can be set depending on the user preference.
Bilinear
The bilinear option uses an averaging method within a 2x2 pixel array to increase the size of the input frame. This is a cruder method of
scaling than the default proprietary ADI Algorithm. In most cases, the scaler should be left at the default setting.
pvsp_vim_scal_type[1:0]
, Primary VSP Map,
Address 0xE8E5[7:6]
This signal is used to set the VIM scaling algorithm. For up-scaling, the proprietary ADI algorithm is recommended; whereas for down-
scaling, the sharp setting is recommended.
Function
pvsp_vim_scal_type[1:0
]
Description
00
Proprietary ADI Algorithm
01
Sharp
10
Smooth
11
Bilinear
3.2.2.4.
Scaler Controls
The following register is used in the control of the VIM scaling function and should be tailored according to user requirements.
pvsp_vim_scal_overshoot_ctrl[11:0]
, Primary VSP Map,
Address 0xE8E9[7:0]; Address 0xE8EA[7:4]
This bit is used to control the overshoot in the scaling of input video. If set to a value larger than the default setting, more overshoot is
allowed.
Function
pvsp_vim_scal_oversho
ot_ctrl[11:0]
Description
0x080
Default
3.2.2.5.
Pixel Packer
At the back end of the VIM, the pixel packer converts input video to word packets suitable for writing to external memory. Refer to
for more details on where the pixel packer is located in the hardware. Depending on the format of the input video, there are four
different packing formats:
•
12-bit 4:4:4 YCbCr
•
10-bit 4:4:4 YCbCr
•
12-bit 4:2:2 YCbCr
•
8-bit 4:2:2 YCbCr
There is a trade off in the number of bits that can be stored. A higher number of bits means the video stored will be stored at a higher
quality, however, this will reduce the available DDR2 memory bandwidth for other functions such as OSD read/write.
The data format can be set by the
register. This register can be set at any time, but it may take some time
(not more than 300 ms) to become valid. This delay is related to the ADV8003 taking control of the memory format change to avoid the
display of garbage information. This information is important when calculating the field/frame buffer sizes, as explained in
Section
Summary of Contents for ADV8003
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