TMS320AV7110 datasheet(42/131 Pages) TI

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DSP

TMS320AV7110

Revision 3.1

10/08/99 22:18

Page 42

FIFO

Analogue

CVBS

CLUT and

Window Attributes

Video

Component Latch

OSD

Component Latch

Analogue

RGB

Digital

Y / C

Blending

Output

Channel Selection

Display

Control

OSD

Data

Video

Decoder

Window

Selection

X position

Y position

Ch0

Ch1

Ch2

Figure 12. OSD Module Block Diagram

8.1.2 OSD data storage

The OSD data has variable size. In the bitmap mode, each pixel can be 1, 2, 4, or 8 bits wide. In the

graphics YCrCb 4:4:4 or CCIR 601 YCrCb 4:2:2 modes, it takes 8-bit per components, and the

components are arranged according to 4:4:4 (Cb/Y/Cr/Cb/Y/Cr …) or 4:2:2 (Cb/Y/Cr/Y …) format. In

the case where RGB graphics data needs to be used as OSD, the application should perform software

conversion to Y/Cr/Cb before storing it. The OSD data is always packed into 32-bit words and left

justified. Starting from the upper left corner of the OSD window, all data is packed into adjacent 32-bit

words. The dedicated bitBLT hardware expedites the packing and unpacking of OSD data. This allows

the ARM to access individual pixels using an internal shifter within the OSD module.

Table 17 shows the fraction of a full size OSD window (720 x 576) supported by the available SDRAM

OSD space. This assumes that the decoded B picture is in normal display mode (non letterbox).

Table 17. SDRAM OSD Window Size

Decoder Options

Fraction of a full-size OSD window supported

internal

display sync

Video Input Buffer split

SDRAM

DRAM

storage

OSD window resolution (bits/pel)

356,376

Full-res

0.06

0.18

0.36

0.72

Half-res

0.21

0.63

1.26

2.51

YES

356,376

Full-res

0.12

0.36

0.72

1.44

Half-res

0.27

0.81

1.62

3.24

YES

225,304

131,072

Full-res

0.27

0.81

1.62

3.24

Half-res

0.38

1.13

2.25

4.50

YES

159,768

196,608

Full-res

0.28

0.83

1.67

3.34

Half-res

0.43

1.28

2.57

5.14

8.2 Setting Up an OSD Window

An OSD window is defined by its attributes. Besides storing OSD data for a window into SDRAM, the

application program also needs to update window attributes and other setup in the OSD module as

described in the following subsections.

8.2.1 CAM Memory

The CAM memory contains X and Y locations of the upper left and lower right corners of each

window. The application program needs to set up the CAM and enable selected OSD windows. The

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