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參數(shù)資料
| 型號： | ADV7321KSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 38/88頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VID ENC 6-12BIT DAC'S 64LQFP |
| 標準包裝： | 1 |
| 類型： | 視頻編碼器 |
| 應用： | EVD，DVD，SD/PS/HDTV |
| 電壓 - 電源，模擬： | 2.5V |
| 電壓 - 電源，數(shù)字： | 2.5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-LQFP |
| 供應商設備封裝： | 64-LQFP（10x10） |
| 包裝： | 托盤 |
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ADV7320/ADV7321
Rev. A | Page 43 of 88
HD TIMING RESET
A timing reset is achieved by toggling the HD timing reset control
bit [Subaddress 0x14, Bit 0] from 0 to 1. In this state, the horizontal
and vertical counters remain reset. When this bit is set back to 0,
the internal counters resume counting.
The minimum time the pin must be held high is one clock
cycle; otherwise, this reset signal might not be recognized. This
timing reset applies to the HD timing counters only.
SD REAL-TIME CONTROL, SUBCARRIER RESET,
AND TIMING RESET
[Subaddress 0x44, Bits 2 and 1]
Together with the RTC_SCR_TR pin and SD Mode Register 3
[Address 0x44, Bits 1 and 2], the ADV7320/ADV7321 can be
used in (a) timing reset mode, (b) subcarrier phase reset mode,
or (c) RTC mode.
a.
A timing reset is achieved after a low-to-high transition on
the RTC_SCR_TR pin (Pin 31). In this state, the horizontal
and vertical counters remain reset. Upon releasing this pin
(set to low), the internal counters resume counting, starting
with Field 1, and the subcarrier phase is reset.
The minimum time the pin must 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) resets the subcarrier phase to 0
on the field following the subcarrier phase reset when the
SD RTC/TR/SCR control bits at Address 0x44 are set to 01.
This reset signal must be held high for a minimum of one
clock cycle.
Because the field counter is not reset, it is recommended
that the reset signal is applied in Field 7 (PAL) or Field 3
(NTSC). The reset of the phase then occurs on the next
field, that is, Field 1, lined up correctly with the internal
counters. The field count register at Address 0x7B can be
used to identify the number of the active field.
c.
In RTC mode, the ADV7320/ADV7321 can be used to
lock to an external video source. The real-time control mode
allows the ADV7320/ADV7321 to automatically alter the
subcarrier frequency to compensate for line length varia-
tions. When the part is connected to a device, such as an
ADV7183A video decoder (see Figure 62), that outputs a
digital data stream in the RTC format, it automatically
changes to the compensated subcarrier frequency on a
line-by-line basis. This digital data stream is 67 bits wide
and the subcarrier is contained in Bits 0 to 21. Each bit is
two clock cycles long. Write 0x00 into all four subcarrier
frequency registers when this mode is used.
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
12345
67
21
313
320
DISPLAY
START OF FIELD 1
05067-036
Figure 60. Timing Reset Timing Diagram
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