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參數(shù)資料
| 型號： | SDA9401 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Scan Rate Converter using Embedded DRAM Technology Units |
| 中文描述： | 掃描頻率轉(zhuǎn)換器采用嵌入式DRAM技術(shù)股 |
| 文件頁數(shù)： | 33/69頁 |
| 文件大小： | 1142K |
| 代理商： | SDA9401 |
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SDA 9401
Micronas
33
Preliminary Data Sheet
mode. The figure below shows the two cases. If RMODE=1, then for each incoming V-sync signal
VIN an outgoing V-sync signal VOUT has to be generated (50 Hz interlaced to 50 Hz progressive
scan rate conversion). If RMODE=0, then during one incoming V-Sync signal, two VOUT pulses
have to be generated (50 Hz interlaced to 100 Hz interlaced scan rate conversion).
Examples for VOUT generation depending on parameter RMODE
The VOUT signal has a delay of two CLKOUT clocks to the HOUT signal or in case of interlaced a
delay of a half line plus two CLKOUT clocks.
Output write parameter
Switching from H-and-V-freerunning to H-and-V-locked mode
In H-and-V-freerunning mode, generally, the phase of the generated synchronization raster has no
correlation to the input raster. A hard switch from the H-and-V-freerunning mode to the H-and-V-
locked mode therefore would cause visible synchronization artefacts. To avoid these problems the
SDA 9400 enlarges the line and the field lengths of the output sync signals HOUT and VOUT in a
defined procedure to enable an unvisible synchronization of the freerunning output to the input.
For vertical synchronization the maximum synchronization time is 260 ms for interlaced and 520 ms
for progressive display modes. Horizontal synchronization is performed in a maximum time of 50
ms. To get the best performance it is recommended to change at first the vertical and after the
mentioned delay times the horizontal mode from free running to locked.
Parameter
Subaddress
Description
VOUTFR
1: freerun
0: locked
mode
RMODE
1: progressive
0: interlaced
14h
VOUT generator mode select
14h
Raster mode
VIN
RMODE=1
VOUT
RMODE=0
VOUT
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