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STV9937 bảng dữ liệu(PDF) 26 Page - STMicroelectronics

tên linh kiện STV9937
Giải thích chi tiết về linh kiện  120-MHz On-Screen Display for Monitors including PictureBooSTTM and 4 True Independent Window Displays
PDF  49 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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RAM Specification
STV9937
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5
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
3 Blocks
1 Block
Window 1
Window 2
Window 3
Window 4
Displayable
Windows



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