ZR36016 Просмотр технического описания (PDF) - Zoran Corporation

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ZR36016

INTEGRATED COLOR SPACE / RASTER-TO-BLOCK CONVERTER

Zoran Corporation 

Integrated Color Space / Raster-To-Block Converter

Decimation/Interpolation Filter Processing

Table 14 is a summary of the decimation and interpolation

modes supported with the various compressed image formats.

Table 15 shows the specific choices for each format as selected

in the MODE field of the Mode Register. HORZ, VERT and

CKRT are bits in Setup Register 1 that select the horizontal and

vertical half-size decimation or interpolation and the clock fre-

quency ratio. Horizontal decimation/interpolation operates on all

color components for 4:2:2, 4:4:4 and 4:4:4:4 formats but the Y

component only for 4:1:1(H4V1) and clearly for 4:0:0. There is

no additional decimation/interpolation supported for 4:1:1

(H2V2). For half-size horizontal decimation/interpolation, filter-

ing may be selected with the HRFL bit. Vertical decimation is a

simple dropping of alternate lines and interpolation is done by

replicating lines.

In compression the decimation is done only on the active

window area and only after decimation is the data stored in the

strip buffer. In expansion, any interpolation is done after reading

data out of the strip buffer. Vertical interpolation is done by

reading out the same line twice. The window area in expansion

is specified after interpolation. Note carefully the minimum

window areas for the different formats in Table 15.

Transfers with the ZR36050 are always at the SYSCLK clock

rate, but as shown in the table, the PXCLK rate can sometimes

be at one-half or one-quarter this rate. There is a choice of

PXCLK to SYSCLK rate ratio for half-size horizontal, by the

CKRT bit. Note, however, that the maximum PXCLK rate is

limited to 15 MHz when color space conversion is used, so

selecting a higher PXCLK to SYSCLK ratio generally implies

reducing the frequency of SYSCLK rather than increasing the

frequency of PXCLK.

Note that in Table 15 the Compressed Format and Resolution is

after decimation in compression or before interpolation in expan-

sion. The ZR36050 Image Format is as defined by the Mode

Register, before decimation in compression or after interpolation

in expansion.

Table 14: Operational Decimation/Interpolation

Modes

ZR36050 Image

Format

4:2:2

Decimation./Interpolation [1]

Full-Screen

x

Horizontal

Half-Screen

x

Vertical

Half-Screen

x

Quarter-

Screen

x

4:1:1 (H4V1)

x

x

x

x

4:1:1 (H2V2)

x

X

X

X

4:4:4

x

x

x

x

4:4:4:4

x

x

x

x

4:0:0

x

x

x

x

1. x = Compressed picture size supported; X = size not supported in this im-

age format.

14

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