参数资料
型号: ADV7184BSTZ
厂商: Analog Devices Inc
文件页数: 75/112页
文件大小: 0K
描述: IC DECODER VID SDTV MULTI 80LQFP
标准包装: 1
类型: 视频解码器
应用: 投影仪,录音机,安全
电压 - 电源,模拟: 3.15 V ~ 3.45 V
电压 - 电源,数字: 1.65 V ~ 2 V
安装类型: 表面贴装
封装/外壳: 80-LQFP
供应商设备封装: 80-LQFP(14x14)
包装: 托盘
ADV7184
Rev. A | Page 65 of 112
CGMS and WSS
The CGMS and WSS data packets convey the same type of
information for different video standards. WSS is for PAL and
CGMS is for NTSC; therefore, the CGMS and WSS readback
registers are shared. WSS is biphase coded, and the VDP performs
a biphase decoding to produce the 14 raw WSS bits in the CGMS/
WSS readback I2C registers and to set the CGMS_WSS_AVL bit.
CGMS_WSS_CLEAR, CGMS/WSS Clear, Address 0x78 [2],
User Sub Map, Write Only, Self-Clearing
1—Reinitializes the CGMS/WSS readback registers.
CGMS_WSS_AVL CGMS/WSS, Available Bit,
Address 0x78 [2], User Sub Map, Read Only
0—CGMS/WSS was not detected.
1—CGMS/WSS was detected.
VDP_CGMS_WSS_DATA_0 [3:0], Address 0x7D [3:0]
VDP_CGMS_WSS_DATA_1 [7:0], Address 0x7E [7:0]
VDP_CGMS_WSS_DATA_2 [7:0], Address 0x7F [7:0]
These read-only bits, located in the user sub map, hold the
decoded CGMS or WSS data.
Refer to Figure 39 and Figure 40 for the I2C to WSS and CGMS
bit mapping.
CC
Two bytes of decoded closed caption data are available in the
I2C registers. The field information of the decoded CC data can
be obtained from the CC_EVEN_FIELD bit (Register 0x78).
CC_CLEAR, Closed Captioning Clear, Address 0x78 [0],
User Sub Map, Write Only, Self-Clearing
1—Reinitializes the CC readback registers.
CC_AVL, Closed Captioning Available, Address 0x78 [0],
User Sub Map, Read Only
0—Closed captioning was not detected.
1—Closed captioning was detected.
CC_EVEN_FIELD, Address 0x78 [1], User Sub Map,
Read Only
Identifies the field from which the CC data was decoded.
0—Closed captioning was detected on an odd field.
1—Closed captioning was detected on an even field.
VDP_CCAP_DATA_0, Address 0x79 [7:0], User Sub Map,
Read Only
Decoded Byte 1 of CC data.
VDP_CCAP_DATA_1, Address 0x7A [7:0], User Sub Map,
Read Only
Decoded Byte 2 of CC data.
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