 |
전자부품 데이터시트 검색엔진 |
|
|
전자부품 데이터시트 검색엔진 |
|
ADV7312 데이터시트(PDF) 36 Page - Analog Devices |
|
||||||||||||||||||||||||||||||
ADV7312 데이터시트(HTML) 36 Page - Analog Devices |
|
|
36 / 84 page  REV. 0 –36– ADV7312 SD Real-Time Control, Subcarrier Reset, and Timing Reset [Subaddress 44h, Bit 2, 1] Together with the RTC_SCR_TR pin and SD Mode Register 3 [Address 44h, Bit 1, 2], the ADV7312 can be used in (a) timing reset mode, (b) subcarrier phase reset mode, or (c) RTC mode. a. A timing reset is achieved in a low-to-high transition on the RTC_SCR_TR pin (Pin 31). In this state, the horizontal and vertical counters will remain reset. On releasing this pin (set to low), the internal counters will commence counting again, the field count will start on Field 1, and the subcarrier phase will be reset. The minimum time the pin has to be held high is one clock cycle; otherwise, this reset signal might not be recognized. This timing reset applies to the SD timing counters only. b. In subcarrier phase reset, a low-to-high transition on the RTC_SCR_TR pin (Pin 31) will reset the subcarrier phase to zero on the field following the subcarrier phase reset when the SD RTC/TR/SCR control bits at Address 44h are set to 01. DISPLAY NO TIMING RESET APPLIED TIMING RESET APPLIED START OF FIELD 4 OR 8 FSC PHASE = FIELD 4 OR 8 FSC PHASE = FIELD 1 TIMING RESET PULSE 307 310 307 1 2 3 4 5 6 7 21 313 320 DISPLAY START OF FIELD 1 Figure 29. Timing Reset Timing Diagram NO FSC RESET APPLIED FSC PHASE = FIELD 4 OR 8 307 310 313 320 DISPLAY START OF FIELD 4 OR 8 FSC RESET APPLIED FSC RESET PULSE FSC PHASE = FIELD 1 307 310 313 320 DISPLAY START OF FIELD 4 OR 8 Figure 30. Subcarrier Reset Timing Diagram This reset signal will have to be held high for a minimum of one clock cycle. Since the field counter is not reset, it is recommended that the reset signal be applied in Field 7 [PAL] or Field 3 [NTSC]. The reset of the phase will then occur on the next field, i.e., Field 1, being lined up correctly with the internal counters. The field count register at Address 7Bh can be used to iden- tify the number of the active field. c. In RTC mode, the ADV7312 can be used to lock to an external video source. The real-time control mode allows the ADV7312 to automatically alter the subcarrier frequency to compensate for line length variations. When the part is con- nected to a device that outputs a digital data stream in the RTC format, such as an ADV7183A video decoder (see Figure 31), the part will automatically change to the com- pensated subcarrier frequency on a line by line basis. This digital data stream is 67 bits wide and the subcarrier is con- tained in Bits 0 to 21. Each bit is two clock cycles long. 00h should be written into all four subcarrier frequency registers when this mode is used. |
유사한 부품 번호 - ADV7312_15 |
|
유사한 설명 - ADV7312_15 |
|
|
링크 URL |
| 개인정보취급방침 |
| ALLDATASHEET.CO.KR |
| ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Korean ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
