ZR36060PQC datasheet(7/46 Pages) ETC

7 / 46 page

Integrated JPEG CODEC

• End-of-image, EOI (0xFFD9). This marker follows the last

byte of the compressed data.

1.2.2.2 Optional markers and marker segments

The ZR36060 supports the following optional markers and

segments:

• Application specific, APPn (0xFFE0-0xFFEF). The standard

allows up to 16 different APP markers in a single image bit-

stream. The ZR36060 can insert one APP marker in

compression. A ZR36060 APP marker can have a segment

length of up to 62 bytes. In decompression, if the image bit-

stream contains a single APP marker with a segment length

of 62 bytes or fewer, the host can retrieve it after the

ZR36060 has finished decompressing the image; if the seg-

ment is longer, the data is lost. If there are multiple APP

segments, only the last one can be retrieved.

• Comment, COM (0xFFFE). The restriction on the length (62

bytes) is the same as for the APP marker.

• Define restart interval, DRI (0xFFDD). Defines that restarts

are to be used, and the size in MCUs of the restart interval.

• Define quantization tables, DQT (0xFFDB). Specifies the

quantization tables used to compress the image.

• Define Huffman tables, DHT (0xFFC4). Specifies the Huff-

man tables used to compress the image.

• Restart, RSTm (0xFFD0-0xFFD7). Marks the beginning of a

restart interval in the compressed data.

Note that when quantization and Huffman tables are loaded into

the ZR36060 by the host controller, they are specified in exactly

the same format as is used in the marker segments.

In compression, the ZR36060 inserts optional marker segments,

if programmed to do so, into the compressed data bitstream in a

fixed order: APP, COM, DRI, DQT, DHT. These appear immedi-

ately after SOI, before SOF. In decompression, they can appear

in any order or position allowed by the JPEG standard.

1.2.3 Motion JPEG

The JPEG standard defines a method for compression of a

single (“still”) image. It does not have any provision for motion

video, and the term “motion JPEG” simply means that each field

of a video sequence is compressed as a separate JPEG image

bitstream. The ZR36060 includes features that make this proce-

dure straightforward.

1.3 Notational Conventions

The following notational conventions are used in this data sheet:

External signals: bold capital letters (e.g.,

COMP)

Active-low mark: overbar (e.g.,

RESET)

Buses: XXmsb_index:lsb_index (e.g.,

UV7:0)

• R - read only

• W - write only

• RW - read-write (data written can be read back)

Numbers: numbers with no prefix or suffix are decimal (e.g., 365,

23.19). Hexadecimal numbers are indicated with a ‘0x’ prefix

(e.g., 0xB000, 0x3). Binary numbers are indicated with a ‘b’ suffix

(e.g., 010b, 0000110100011b).

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