參數(shù)資料
型號： STK6005F
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)： 16/36頁
文件大小： 391K
代理商： STK6005F
16
STK6005
3. Synchronization to Input V-Sync and H-Sync:
EnSyncH {0x3D[7]} = 1
EnSyncV {0x3D[6]} = x
In this mode, the input timing also has impacted on the output horizontal and vertical timings. The
input V-Sync leading edge will also generate a lock event to lock the output display timing. Therefore, the
output vertical period will keep the same as the input vertical period. But the output horizontal period is
gained by (EmPHT / 16) cycles of input VCLK to keep output horizontal timing tracking to input
horizontal timing. The register EmPHT should be set to the value of input horizontal period (in pixels) *
RateV * 16, where the RateV = total input lines / total output lines. The register value of PHT will be
ignored. The register value of PVT should be set to maximum (0x7FF) value for this mode. For the
advantage of this mode, even when some errors result in the real output video clock (PCLK) and in the
ideal output video clock (VCLK * RateH * RateV), the buffer overrun or underrun will not happen
internally due to the accumulation of errors. For the disadvantage of this mode, each output horizontal
period may be somewhat different.
5.9 Contrast and Brightness Control
STK6005 can adjust the contrast and brightness of output pixels after scaling operation. Registers GainR,
GainG, and GainB adjust the contrast of red, green, and blue respectively for output pixels. Registers
DC_R, DC_G, DC_B adjust the brightness for output pixels. Gain registers are those with an 8-bit
unsigned value and DC registers are those in a 2’s complement format. The adjustment formula is listed
below:
Red (out) = Red(in) * GainR / 128 + DC_R
Green (out) = Green(in) * GainG / 128 + DC_G
Blue (out) = Blue(in) * GainB / 128 + DC_B
5.10 Gamma Correlation
STK6005 provides an 8-to-10 bits of the color look-up table for each color channel intended for Gamma
correction. A 10-bit output results in an improved color depth control. The 10-bit output is then
dithered down to 8 or 6 bits per color for display output. The Gamma look-up table (LUT) is user-
programmable to provide an arbitrary transfer function.
Before the Gamma LUT is programmed, the Gamma correction function should be disabled first and
then decides which Gamma LUTs of colors is to be programmed. The Gamma LUT will be written at the
same time if the GmaWE flag for respective color is set to 1. The programming steps are shown as below:
1. Disable Gamma correction function (set EnGamma flag to 0).
2. Set respective GmaWE flag of each color to 1 to enable programming.
3. Write start programming address into uWrGmaA register.
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