參數(shù)資料
型號: ZR36067
廠商: Zoran Corporation
英文描述: PCI Adapter Intended for Multimedia Applications on PCI Systems(PCI(外圍部件互連)適配器(用于PCI系統(tǒng)的多媒體))
中文描述: PCI適配器預定在PCI系統(tǒng)的多媒體應用(個PCI(外圍部件互連)適配器(用于的PCI系統(tǒng)的多媒體))
文件頁數(shù): 47/48頁
文件大小: 580K
代理商: ZR36067
47
AV PCI CONTROLLER
Calculating the Horizontal Parameters:
X and We denote two temporary variables:
X = ceil (VidWinWid*64/Wa)
We = floor (VidWinWid*64/X)
HorDcm = 64 - X
hcrop1 = 2*floor((Wa-We)/4)
hcrop2 = Wa - We - hcrop1
HStart and Hend are then calculated from hcrop1 and hcrop2.
In the example:
X = ceil(597*64/720) = 54
We = floor(597*64/54) = 707
HorDcm= 64 - 54 = 10
hcrop1 = 2*floor((720-707)/4) = 6
hcrop2 = 720-707 - 6 = 7
HStart = HStart’ + hcrop1 = 122 + 6 = 128
HEnd = HEnd’ - hcrop2 = 841 - 7 = 834
(834 - 128 + 1 = 707)
The ZR36067 will actually sample-in 707 pixels from every line.
The first 6 and the last 7 active pixels will be cut out.
Calculating the Vertical Parameters
(Regardless of DispMod!)
Y and He denote two temporary variables:
Y = ceil (VidWinHt*64*2/Ha)
He = floor (VidWinHt*64/Y)
VerDcm = 64 - Y
vcrop1 = floor((Ha/2 - He)/2)
vcrop2 = Ha/2 - He - vcrop1
VStart and VEnd are then calculated from vcrop1 and vcrop2.
In the example:
Y = ceil(199*64*2/480) = 54
He = floor(199*64/54) = 235
VerDcm= 64 - 54 = 10
vcrop1 = floor(((480/2) - 235) / 2) = 2
vcrop2 = (480/2) - 235 - 2 = 3
VStart = VStart’ + vcrop1 = 10 + 2 = 12
VEnd = VEnd’ - vcrop2 = 249 - 3 = 246
(246 - 12 + 1 = 235)
The ZR36067 will actually sample-in 235 lines from every field.
The first 2 and the last 3 active lines of every field will be cut out.
Figure 17. Input Image Parameters
H
VSYNC
floor or ceil (Ht/s)
VStart
VEnd’
VStart’
VEnd
H
H
H
H
hcrop1
hcrop2
v
v
Wa
Ha/2
Total size of one input field
Active portion of one input field
The effective portion taken by the ZR36120 according to the
programmed parameters. (The effective portion can be the
entire active field or any partial sub-section of it).
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