ZR36060PQC datasheet(13/46 Pages) ETC

13 / 46 page

Integrated JPEG CODEC

the ZR36060 counts Hstart pixels qualified by PVALID, and then

samples pixels qualified by PVALID until Hend.

The polarity of PVALID is programmable by means of the

PValPol parameter.

3.4 Video Scaling

The ZR36060 incorporates a scaler, that can scale the video in

the active area, horizontally and vertically, by simple ratios. It can

down-scale the video before it is compressed, and up-scale it

after it is decompressed. The result is to permit straightforward

implementation of “half screen area” and “quarter screen area”

compression.

The horizontal down- and up-scaling are accompanied by filter-

ing. Note that this filtering can not be disabled.

3.4.1 Horizontal down-scaling in compression

This is specified by the 2-bit HScale parameter. There are three

possible configurations:

HScale = 00b or 11b: No down-scaling

HScale = 01b: 2:1 decimation, with a 3-tap filter

HScale = 10b: 4:1 decimation, with a 5-tap filter

3.4.2 Vertical down-scaling in compression

This is specified by the 1-bit

VScale parameter:

VScale = 0b: No down-scaling

VScale = 1b:2:1 decimation, by line dropping

In the case of 2:1 vertical scaling, the second, fourth,...etc. lines

of the active area of the video field are dropped before the video

is compressed.

3.4.3 Horizontal up-scaling in decompression

As in compression, this is specified by

HScale:

HScale = 00b or 11b: No up-scaling

HScale = 01b: 2:1 interpolation

HScale = 10b: 4:1 interpolation

The interpolated samples are created by weighted-averaging of

two neighboring samples.

1. HPol = 0; VCLKPol = 0 (sample when VCLK = 0); PValPol = 1 (valid when PVALID = 1).

2. “Horizontal counter” represents an internal counter used to identify the active area.

3. PVALID granularity is one VCLK, in both 8- and 16-bit video interface modes.

4. PVALID may toggle only on a pixel boundary, in this figure when VCLK=0.

Figure 9. Video Data Formats, 8 and 16 bit

VCLKx2

VCLK

Y[7:0] Input

PVALID

8-Bit Video Interface

HSYNC

Min Width

Y[7:0] Output

Horizontal Counter

16-Bit Video Interface

Y[7:0] Input

UV[7:0] Input

PVALID

Min Width

Y[7:0] Output

UV[7:0] Output

Horizontal Counter

Notes:

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