ZR36060PQC datasheet(35/46 Pages) ETC

35 / 46 page

Integrated JPEG CODEC

SUBIMG Window Registers

Address: 0x04A - 0x051

Parameters used to define the ‘sub-image window’ rectangle of the video. Master/

Slave modes do not affect these parameters.

Horizontal measures are in number of VCLKs (1 VCLK = 1 pixel, regardless of the

video bus width), from the leading edge of HSYNC.

Vertical measures are in number of HSYNCs (1 HSYNC = 1 line), from the leading

or trailing edge of VSYNC according to the FIVedge parameter.

SVstart[15:0]: Length from VSYNC edge to first subimage line measured in

number of lines. Writing N indicates that the first subimage line is line N+1. (e.g. -

SVstart = 11, to have the first subimage line on line number 12).

SVend[15:0]: Length from VSYNC edge to last subimage line measured in

number of lines. Writing N indicates that the last line is line N. (e.g. - SVend = 241,

to have the last line on line number 241).

Maximum permitted value for (SVend - SVstart) is 32768.

SHstart[9:0]: Length from HSYNC leading edge to first subimage pixel measured

in number of pixels. Writing N indicates that the first subimage pixel is pixel number

N+1. (e.g. - SHstart = 99, to have the first subimage pixel on VCLK number 100).

SHend[9:0]: Length from HSYNC leading edge to last subimage pixel measured

in number of pixels. Writing N indicates that the last subimage pixel is pixel number

N. (e.g. - SHend = 720, to have the last subimage pixel on VCLK number 720).

Maximum permitted value for (SHend - SHstart) is 1024.

8.4 JPEG Marker Segments

The following table shows the mapping of all JPEG markers in

the ZR36060 internal memory. The Value column contains

common values (hexadecimal) used when compressing/decom-

pressing YUV 4:2:2 format images. There are no default values

since all the markers are contained inside the internal RAM,

therefore the user must pre-load the correct values before oper-

ating the ZR36060.

In compression the marker segments data appears in the com-

pressed image bitstream. Inclusion of optional marker segments

is controlled by the Markers Enable register.

In decompression, the marker segments contained in the com-

pressed bitstream are automatically written by the ZR36060 into

the appropriate internal memory locations. At the end of a com-

pression, the host can read them if so desired.

The marker segments in the Internal Memory have exactly the

same syntax as the marker segments specified in the JPEG

standard. These segments are: SOF, SOS, DRI, DQT, DHT,

APP, and COM. The SOI, EOI and RST markers are supported

automatically by the ZR36060.

Before starting to compress a sequence of images, the host

must program the appropriate marker segments in the internal

memory, and issue a Load command to load them. Only the

markers actually used need to be programmed: the required

markers SOF and SOS, and whichever optional markers are

specified in the Markers Enable register. Note that the starting

location of each marker segment in the internal memory is fixed,

but the length and the content of each marker segment may

vary.

The host does not have to program any of the marker segments

in order to decompress an image bitstream that contains all the

necessary tables. If the bitstream is in the abbreviated format

and lacks one or more tables, the host must program the appro-

priate tables in the internal memory, and issue a Load command

before starting to decompress a sequence of images that use the

same tables.

0x04A

SVstart [15:8]

R/W

default

type

0x04B

SVstart [7:0]

0x04C

SVend [15:8]

0x04D

SVend [7:0]

0x04E

SHstart [9:8]

0x04F

SHstart [7:0]

0x050

SHend [9:8]

0x051

SHend [7:0]

Table 4: ZR36060 JPEG Markers

Address

Content

Value

Description

060

SOF0

Start Of Frame marker (FFC0). This

segment contains 17 bytes that

define the 3 Y,U,V components of

the MCU. Is used both in compres-

sion and decompression.

061

SOF0

062

LEN_H

Length of this segment (without the

marker)

063

LEN_L

064

Precision (8 bits)

065

Y_H

Number of lines in the active area

(must always equal Vend - Vstart)

066

Y_L

067

X_H

Number of pixels in the active area

(must always equal Hend - Hstart)

068

X_L

069

Number of Color Components (YUV

= 3 components)

06A

ID for the Y Component

06B

HY,VY

Number of appearances of Y in

MCU, horizontally and vertically

06C

TqY

Quantization table ID for Y

06D

ID for the U Component

06E

HU,VU

Number of appearances of U in

MCU, horizontally and vertically

06F

TqU

Quantization table ID for U

070

ID for the V Component

071

HV,VV

Number of appearances of V in

MCU, horizontally and vertically

072

TqV

Quantization table ID for V

...

Unused

07A

SOS

Start Of Scan marker (SOS).

Contains the Huffman table IDs to

use with each Y,U,V component in

the MCU.

07B

SOS

07C

LEN_H

Length of this segment (without the

marker)

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