STV3550 datasheet(42/144 Pages) STMICROELECTRONICS

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STV3550

Graphics Functional Description

Note:

The Palettep[31:0] value is not the address of the first byte of the first color in the palette. It is the

address of the first byte of the first color loaded in the OSD CLUT.

The address of the first byte (first pixel) in the Top Field block which will be displayed in the OSD

region is defined in bits Topp[31:0].

The address of the first byte (first pixel) in the Bottom Field block which will be displayed in the

OSD region is defined in bits Bottomp[31:0].

Note:

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).

The address of the next OSD specification in the SDRAM is defined in bits OSDp[31:0]. If the

current OSD specification is the last one displayed on the TV screen, the Stop Linked List (SLL) bit

must be set.

OSD Region Positions

The top position of the current OSD region is specified in bits Y_top[10:0] which define the vertical

start of the OSD region on the screen. This value is given as a number of TV lines. The top line

specified in the first word of an OSD region specification must be greater than or equal to 3.

The bottom position of the current OSD region is specified in bits Y_bottom[10:0] which define the

vertical end of the OSD region on the screen. This value is given as a number of TV lines.

The left position of the current OSD region is specified in bits X_left[11:0] which define the

horizontal start of the OSD region on the screen. This value is given as a number of pixel clock

periods.

The right position of the current OSD region is specified in bits X_right[11:0] which define the

horizontal end of the OSD region on the screen. This value is given as a number of pixel clock

periods.

Note:

An OSD region must be at the same position (same TV line) in both Interlaced and Progressive

mode. In Progressive or Non-Interlaced mode, the Y_top and Y_bottom positions are programmed

the same way. This means that the number of TV lines displayed for an OSD region in Progressive

mode is never an odd number. An OSD region will always have (Y_bottom -Y_top)*2 TV lines

displayed.

In Interlaced mode, the same number of TV lines is displayed in both fields. Value “Y_bottom -

Y_top” is field-based.

OSD Region Characteristics

The total number of pixels to be displayed in the top or bottom field for the current OSD region is

given in bits TPND[21:0]. The number of pixels in the Top Field block is the same as in the Bottom

Field block. This is not the number of pixels programmed in the Top and Bottom Field blocks.

The pitch value which will be added to the Topp[31:0] or Bottomp[31:0] pointers in order to load the

next pixels is defined in bits Pitch[12:0]. This value represents the maximum number of pixels which

will be displayed in a TV line.

The number of pixels displayed in a single TV scan line is given in bits PNDL[11:0]. This value is

the same for all TV scan lines in a given OSD region.

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