欢迎访问ic37.com |
会员登录 免费注册
发布采购

BT861KRF 参数 Datasheet PDF下载

BT861KRF图片预览
型号: BT861KRF
PDF下载: 下载PDF文件 查看货源
内容描述: 多端口的YCrCb到NTSC / PAL / SECAM数字视频编码器 [Multiport YCrCb to NTSC / PAL / SECAM Digital Video Encoder]
分类和应用: 商用集成电路编码器
文件页数/大小: 111 页 / 1232 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
 浏览型号BT861KRF的Datasheet PDF文件第55页浏览型号BT861KRF的Datasheet PDF文件第56页浏览型号BT861KRF的Datasheet PDF文件第57页浏览型号BT861KRF的Datasheet PDF文件第58页浏览型号BT861KRF的Datasheet PDF文件第60页浏览型号BT861KRF的Datasheet PDF文件第61页浏览型号BT861KRF的Datasheet PDF文件第62页浏览型号BT861KRF的Datasheet PDF文件第63页  
Bt860/861  
3.0 Digital Processing and Functionality  
3.2 Effects  
Multiport YCrCb to NTSC/PAL /SECAM  
CRC data is not calculated and must be provided by the user. Figure 3-19  
illustrates a typical CGMS signal. Note that bit 1 is closest to the HSYNC pulse  
and bit 20 is farthest. The amplitude of the CGMS pulses are 70 IRE when high,  
and 0 IRE when low. For further CGMS details, see specifications  
EIA-J CPR-1202, EIA-J CPR-1204, and IEC 61880.  
Figure 3-19. CGMS Waveform  
V
IRE  
100  
1.0  
Bit No.  
1
Reference  
2
3
.. .. .. 20  
0.786  
70  
0.286  
0
0
2.235 µs ± 50 ns  
–40  
11.2 µs ± 0.3 µs  
49.1 µs ± 0.44 µs  
Line 20/283  
861_003  
3.2.18 Closed Captioning and Extended Data Services  
The Bt860/861 can produce Closed Captioning (CC) and Extended Data Services  
(XDS) waveforms for NTSC and PAL on the lines specified by CC_SEL (49[3:0])  
and XDS_SEL (49[7:4]), as listed in Table 3-12. Two bytes of CC data are entered  
using registers CCB1 (42[7:0]) and CCB2(43[7:0]), and two bytes of XDS data are  
entered using registers XDSB1 (40[7:0]) and XDSB2 (41[7:0]). The data registers  
are double buffered to prevent accidental overwriting of the data. To enable CC, set  
register bit ECC (48[0]) high, and to enable XDS, set register bit EXDS (48[1])  
high. To prevent writing partial data sequences, data is not latched until the second  
byte of the two-byte data sequence (CCB2 or XDSB2) is written. Therefore, data  
must be written in the order Byte 1, then Byte 2.  
Table 3-12. Closed Captioning and Extended Data Services Control Bits  
0x49  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
XDS_SEL  
CC_SEL  
525 Line  
625 Line  
285  
336  
284  
335  
283  
334  
282  
333  
22  
24  
21  
23  
20  
22  
19  
21  
D860DSA  
Conexant  
3-29  
 复制成功!