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| 型號： | TVP3703-170 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Video Interface PALETTE Exract(雙PLL，先進(jìn)的視頻接口調(diào)色器) |
| 中文描述： | 視頻接口調(diào)色板Exract（雙鎖相環(huán)，先進(jìn)的視頻接口調(diào)色器） |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 427K |
| 代理商： | TVP3703-170 |
TVP3703
VIDEO INTERFACE PALETTE
TRUE-COLOR CMOS RAMDAC
SLAS100 – MARCH 1996
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
direct RS access (continued)
Table 1. Direct RS Micro Port Accesses
RS(2–0)
VGA REGISTER
000
Address register (palette write)
001
Palette color value
010
Pixel mask/indirect access
011
Address register (palette read)
100
Index low byte
101
Indexed register
110
Pixel command register
111
Index high byte
indirect access
The indexed register space can also be accessed by a special mechanism of successive reads to the mask
register location 2h, as shown in Table 2. Reads from RS location 2h cause a state counter to be advanced by
one. Five successive reads of RS location 2h returns the mask register contents four times followed by the pixel
command register value.
If the indexed register space is not enabled, the next access is directed to the pixel mask (state 1 in Table 2).
States 3 to 4 require three reads from the pixel mask register and, when the pixel command register is written
to enable the indexed register space, the next access is again directed to the mask register (the next state after
state 5 is state 1).
The indirect access sequence can now enter states 6 and 7 to access the lower and higher byte of the index
register respectively. Subsequent reads or writes to location 2h access the register space pointed to by the index
register. After each indexed register access, the index register increments automatically. In this way, the entire
indexed register space can be moved as a block without the need to keep writing to the index register.
At any point in the above sequence, a read or write to any location other than 2h resets the state counter to
state 1.
On power up, the indirect access is truncated through the default setting of pixel command register bit 4 so that
the TVP3703 is identified by existing video basic input/output system (BIOS) code as a fast ATT20C490
RAMDAC.
Table 2. Indirect Access Sequence
CURRENT STATE
NEXT STATE
STATE
REGISTER MAPPED
AT RS = 2h
READ FROM
RS = 2h AND INDEX
SPACE ENABLED
READ FROM
RS = 2h AND INDEX
SPACE DISABLED
(DEFAULT)
WRITE TO
RS = 2h
READ/WRITE TO
OTHER RS LOCATION
1
Pixel mask
2
2
1
1
2
Pixel mask
3
3
1
1
3
Pixel mask
4
4
1
1
4
Pixel mask
5
5
1
1
5
Pixel command
6
1
1
1
6
Index low byte
7
7
1
7
Index high byte
8
8
8
8
1
8
Indexed register
1
Power-up state is state 1.
Increment index register after access
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| TVP3703-135 | Video Interface PALETTE Exract(雙PLL，先進(jìn)的視頻接口調(diào)色器) |
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| TVP3703FN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VIDEO INTERFACE PALETTE TRUE-COLOR CMOS RAMDAC |
| TVP4020AGFN | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| TVP4020AGFN-8 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
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