STV3550 datasheet(40/144 Pages) STMICROELECTRONICS

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STV3550

Graphics Functional Description

(or OSD specification) stored in the SDRAM is defined in bits FSA[31:0] in the First Specification

Address register.

Each block (Header, Palette and Bitmap Data) defines one field of one OSD region and must be

contiguous. Each block and its first bitmap pixel address must be aligned on a 32-bit boundary in

the SDRAM.

The line numbers used to define the top and bottom lines of an OSD region are the internal (field)

line numbers illustrated in Figure 29. The same OSD specification may be used for both fields in a

single frame.

Field Storage Formats

OSD planes can be stored in a field-based format with an OSD top field and an OSD bottom field,

or using a frame-based format.

If the bitmap is stored in frame-based format, it can be read as top and bottom fields using the Pitch

function. Using pointers Topp[31:0] and Bottomp[31:0], the top field block and the bottom field block

can be the same (e.g. it can be used for Simple Character mode). In this case, the data in the Top

Field is the same as in the Bottom Field.

Figure 29: Linked List Structure for OSD Data

OSD1

Decoded Image

OSD1 Bottom Field Block

Header 1

STOP, if Stop Linked Lists bit is set.

OSDp[31:0]

Bottomp[31:0]

Bottomp[31:0]: Bottom Field Block Pointer of the current OSD region

OSDp[29:0]: Next OSD region specification pointer

Palette

Topp[31:0]

Topp[31:0]: Top Field Block Pointer of the current OSD region

First Specification Address register

Palettep[31:0]

Bottomp[31:0]

Topp[31:0]

Header 3

Header 2

OSD1 Top Field Block

OSD2 Bottom Field Block

OSD2 Top Field Block

OSD3 Bottom Field Block

OSD3 Top Field Block

OSD2

OSD3

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