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參數(shù)資料
| 型號： | TMS320AV411 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital NTSC/PAL Encoder(數(shù)字NTSC/PAL編碼器) |
| 中文描述： | 數(shù)字的NTSC / PAL編碼器（數(shù)字的NTSC / PAL編碼器） |
| 文件頁數(shù)： | 12/33頁 |
| 文件大小： | 634K |
| 代理商： | TMS320AV411 |
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TMS320AV410, TMS320AV411
DIGITAL NTSC/PAL ENCODER
SCSS020B – JULY 1996 – REVISED MAY 1997
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
simple serial host interface mode
When IFMOD1 is low and IFMOD0 is high, the ’AV410/411 operates in simple serial host interface mode. In this
mode, data transfer is executed via a four-line interface. A chip select (CS), serial data input (SDA), serial data
output (SOUT), and serial clock (SCL) are used to write data and read status from the device registers. Data
transfers are always most significant bit first. Figure 9 illustrates the read/write operation in simple serial host
interface mode.
A write is executed by first pulling CS low. After the falling edge of CS, the first eight bits entered on SDA should
be the address of the first register to write. Next the data is entered on SDA. The ’AV410/411 address pointer
is automatically incremented to allow successive data register writes as long as CS remains low. The status data
byte is read out on the SOUT pin simultaneous with each byte written to the ’AV410/411. To obtain status data
without performing a write, the host should perform a dummy write cycle to address 0xFF after pulling CS low.
Note that the first four bits of the status byte are always zero. See Table 2 for a description of status output.
When operating in the simple serial host interface mode, the ’AV410/411 overlay function uses the colors set
in the lookup table. When using the overlay function, the user must set these colors (via the YG, B, and R
registers) at least once after powerup.
CS
SCL
SDA
SOUT
EVEN
VBL
CST1
CST0
EVEN
VBL
CST1
CST0
HI-Z
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
Figure 9. Simple Serial Mode Read/Write
Table 2. Status Data Bit Descriptions
BIT
LOCATION
DESCRIPTION
FUNCTION
7:4
Unused
Always 0
3
Non-interlace scan field status
1 = Even field
0 = Odd field
2
Vertical blanking indicator
1 = Blanking line
0 = Active video line
1
Caption data status 1
1 = Second caption data field not available for write
0 = Second caption data field available for write
0
Caption data status 0
1 = First caption data field not available for write
0 = First caption data field available for write
P
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