STV9937 datasheet(26/49 Pages) STMICROELECTRONICS

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RAM Specification

STV9937

26/49

RAM Specification

5.1

Character Coding

Each character to display is coded with 12 bits in the RAM with the following addressing method:

●

Character Code: Bits RC[8:0] are used to address the ROM Code

●

Color Code: Bits CB[2:0] are used to select 1 of the 8 color-boxes in the color shop of the

corresponding OSD window.

5.2

Window Memory Allocation

The 4 OSD windows can be distributed differently. But the displayable windows will always contain

a total of 20 blocks (1 block consists of 32 characters).

5.3

Memory Size Allocation

The total number of characters or spaces is up to 640 with a maximum window size of 16 rows of 32

characters.

The character codes of each window are allocated to a specific memory space. This memory space

is programmable for each window. The window size must be less than or equal to its memory

allocation. Any window size can be modified within its specific memory space, the other windows

are not affected by this operation.

Table 28: Character Coding

FWR

FAC

Bit 11

Bit 10

Bit 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

See Table 3

CB[2:0]

RC[8:0]

Figure 12: Window Memory Space

Window 0

Color-boxes

10 Blocks

4 Blocks

3 Blocks

1 Block

Window 1

Window 2

Window 3

Window 4

Displayable

Windows

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