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參數(shù)資料
| 型號： | AK8850 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | NTSC Digital Video Decoder |
| 中文描述： | NTSC制式數(shù)字視頻解碼器 |
| 文件頁數(shù)： | 55/99頁 |
| 文件大?。?/td> | 1757K |
| 代理商： | AK8850 |
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ASAHI KASEI
[AK8850]
READ OPERATION OF VBID DATA
To read the VBID data, write “1” to the VBIDRQ-bit. The AK8850 is put into a wait state while VBID data decodes.
Received WSS data is decodecd and after the decoding is complete, ”1” is sent back to VBID-bit of the [ STATUS 2
REGISTER ]. The VBID-bit is usually at “1” after a reset ( it becomes “0” by writing “1” at VBIDRQ-bit ).
The decoded 13-bit data is then written into the [ VBID 1.2 REGISTER ] as shown.
Data in the [ VBID 1.2 REGISTER ] is remains until it is over-written.
* [ VBID 1 REGISTER ]
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
VBID7
VBID8
VBID9
VBID10
VBID11
VBID12
VBID13
VBID14
* [ VBID 2 REGISTER ]
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Reserved
VBID1
VBID2
VBID3
VBID4
VBID5
VBID6
READ OPERATION OF WSS DATA
To read WSS data, write “1” to the WSSRQ-bit, The AK8850 is placed into a wait state while the WSS data decodes.
Received WSS data is decoded and after the decoding is complete, ”1” is sent back to WSS-bit of the [ STATUS 2
REGISTER ].WSS-bit is usually at “1” right after the reset ( it becomes “0” by writing “1” at WSSRQ-bit ).
Then the decoded data is written into the [ WSS 1 REGISTER ] and [ WSS 2 & ASPECT DATA REGISTER ] as shown.
Data in the [ WSS 1 REGISTER ] and [ WSS 2 & ASPECT DATA REGISTER ] is remains until it is over-written.
* [ WSS 1 REGISTER ]
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
Bit 0
G2-7
G2-6
G2-5
G2-4
G1-3
G1-2
G1-1
G1-0
* [ WSS 2 & ASPECT DATA REGISTER]
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
ASPECT
Reserved
G4-13
G4-12
G4-11
G3-10
G3-9
G3-8
7-4-12 VIDEO ASPECT SIGNAL
This command detects the Video Aspect signal ( refer to the following diagram ) that is superimposed on Line 16 and Line
279 of the Composite signal. The Aspect signal detection is performed by making a decode request which is set by the
[ REQUEST VBI INFO REGISTER ].
After the decoding is completed, a decode complete notification is generated. The decode data is written into the
Aspect-bit of the [ WSS 2 & ASPECT DATA REGISTER ].Aspect-bit data remains until it is over-written.
Video Aspect Signal Outline
Input signal : Composite signal only ( at NTSC / YC input only )
Line : 16 Line and 279 Line
th
Level : 70 +/- 25 IRE
Rising Edge Point : 12.5 +/- 3.2 microsec from HSYNC rising edge ( at 50 % point )
Falling Edge Point : 58.9 +/- 3.2 microsec from HSYNC falling edge ( at 50 % point)
Aspect Bit :
Wide at “1”
Normal at “0”
50%
70+/-25 IRE
12.5+/-3.2usec
58.9+/-3.2usec
Rev.0
59
2003/01
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