ZR36057PQC Просмотр технического описания (PDF) - Zoran Corporation

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ZR36057PQC

ENHANCED PCI BUS MULTIMEDIA CONTROLLER

Zoran Corporation 

Enhanced PCI Bus Multimedia Controller

VSYNC

VStart’ VEnd’ VStart VEnd

floor or ceil (Ht/s)

hcrop1

Wa

Ha/2

hcrop2

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).

Figure 17. Input Image Parameters

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 ZR36057 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 ZR36057 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.

47

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