參數(shù)資料
型號: STK6005
廠商: Electronic Theatre Controls, Inc.
英文描述: converting PC / Mac video images for a TFT-LCD display monitor
中文描述: 轉(zhuǎn)換電腦/蘋果的視頻圖像的TFT液晶顯示屏
文件頁數(shù): 15/36頁
文件大?。?/td> 391K
代理商: STK6005
15
STK6005
HSR = horizontal input display resolution / output display resolution * 32768
VSR = vertical input display resolution / output display resolution * 32768
This chip provides 6 advanced filters to get a high quality-scaling image for requirements on different
sharpness. Set EnFilt flag to 1 to enable scaling function using the filter defined by FiltType register.
5.8 Operating Mode
STK6005 uses internal line buffers to perform the scaling function. Since there is no external frame buffer
serving as a frame rate converter, the output vertical frequency is always equal to the input vertical frequency
during normal operation. The period of PCLK should be programmed as close as the formula listed below to
avoid over-run / under-run conditions of internal line-buffers.
Period of PCLK = Period of VCLK * RateH * RateV
where
RateH = total pixels of an input line / total pixels of an output line
RateV = total input lines / total output lines
= total input display lines / total output display lines
STK6005 provides three operating modes to synchronize the input and output display timing:
1. Free-run mode:
EnSyncH {0x3D[7]} = 0
EnSyncV {0x3D[6]} = 0
In this mode, there is no timing relationship between the input and output timing. Registers PHT and
PVT control the output horizontal period and vertical period respectively. For this mode, even if no input
signal comes, the output timing can also be generated automatically. This mode is used when there is no
valid input or used for testing purpose.
2. Synchronization to Input V-Sync:
EnSyncH {0x3D[7]} = 0
EnSyncV {0x3D[6]} = 1
In this mode, the input vertical timing has impacted on the output vertical timing. The input V-Sync
leading edge will generate a locking event to lock the output display timing. Therefore, the output vertical
period will keep the same as the input vertical period. The latency between the input V-Sync leading edge
and the locking event can be programmed through registers DlyLine and DlyPxl. The output horizontal
period is set by PHT. The PVT value should be set to maximum (0x7FF) value for this mode. For the
advantage of this mode, all output horizontal periods are equal. For the disadvantage of this mode, when
some errors occur in the real output video clock (PCLK) and in the ideal output video clock (VCLK *
RateH * RateV), the buffer overrun or underrun may happen internally due to the accumulation of errors.
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