STV9937 datasheet(15/49 Pages) STMICROELECTRONICS

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STV9937

Window Specifications

3.3

Window Positions in the Frame

All values are referenced to the origin coordinates (HD, VD). For more information, refer to

Figure 6 on page 13.

3.3.1

Window Horizontal Delay

The window horizontal delay defines the horizontal start position for each separate OSD window.

This value is selected by bits HDW1[6:0], HDW2[6:0], HDW3[6:0] and HDW4[6:0], respectively.

The range of the window horizontal delay is from 0 to 1524 pixels, in steps of 12 pixels each.

Window Horizontal Delay = HDWi[6:0] x 12 pixels

The total horizontal delay of a window is:

General Horizontal Delay + HDWi[6:0] x 12 pixels; or,

HD[6:0] x 6 pixels + HDWi[6:0] x 12 pixels + (50 pixels).

The default values for the window horizontal delay for each of the four OSD windows is given in

Table 8.

3.3.2

Window Vertical Delay

The window vertical delay defines the vertical start position for each separate OSD window. This

value is selected by bits VDW1[5:0], VDW2[5:0], VDW3[5:0] and VDW4[5:0], respectively.

The range of the window vertical delay is from 0 to 63 rows of characters, in steps of 1 character row

each. It is important to note that the height of each character row is defined by the row height

parameter. For more information, refer to Section 4.4: Space Lines on page 21.

Window Vertical Delay = VDWi[5:0] x Row_Height

The total vertical delay of a window is:

General Vertical Delay + VDWi[5:0] x Row_Height (in scan lines); or,

(VD[7:0] x 4 + 2) + VDWi[5:0] x Row_Height (in scan lines).

The default values for the window vertical delay for each of the four OSD windows is given in

Table 9.

Table 8: Window Horizontal Delay

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

0Ch, 11h,

16h, 1Bh

0h, 20h,

0h, 10h

HDWi[6:0]

Table 9: Window Vertical Delay

FWR

FAC

Default

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

80h

0Dh, 12h,

17h, 1Ch

0h, 0h,

Ch, Ch

VDWi[5:0]

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