參數(shù)資料
型號(hào)： CXD3531R
英文描述： Digital Signal Driver/Timing Generator
中文描述： 數(shù)字信號(hào)驅(qū)動(dòng)器/時(shí)序發(fā)生器
文件頁(yè)數(shù)： 18/30頁(yè)
文件大?。?/td> 360K
代理商： CXD3531R
– 18 –
CXD3531R
3-2. Conditions for Accessing Gamma RAM and Color Shading RAM
With this IC, there are two way to access the internal RAM: by the host I/F using the I
2
C bus and refresh/write-
back for sending/receiving data via external ROM I/F. In the case of Gamma RAM, internal RAM must be
accessed by the host I/F in 2-byte units, and memory address must be read from or written to even memory
addresses. Color shading RAM can be accessed in 1-byte units and there is no restriction on which addresses
can be read or written.
It is possible to access internal RAM from each I/F when the conditions given in the following table are
established.
GAM_ON
0
1
1
Vertical blanking period
—
Vertical blanking period
Outside vertical blanking period
Gamma RAM access
Yes
Yes
No
GAM_ON represents the setting value of the DSD register.
Gamma correction is not performed when GAM_ON is "0", and is performed when
GAM_ON is "1".
Conditions for Accessing Gamma RAM
CSC_ON
0
1
1
Vertical blanking period
—
Vertical blanking period
Outside vertical blanking period
Color shading RAM access
Yes
Yes
No
CSC_ON represents the setting value of the color shading register.
Color shading correction is not performed when CSC_ON is "0", and is performed when
CSC_ON is "1".
Conditions for Accessing Color Shading RAM
GAM_ON must be set to "0" when performing a write-back or forced refresh operation for Gamma RAM.
Similarly, CSC_ON must be set to "0" when performing a write-back or forced refresh operation for color
shading RAM.
In the case of a self-refresh operation, the start of vertical blanking period is automatically detected and
operations start automatically at that time, regardless of how GAM_ON and CSC_ON are set. Therefore, be
sure to set the external I
2
C ROM transfer count register ROM_TRAN to fit within the vertical blanking period.
Furthermore, the vertical blanking period for gamma is set using CSC_HP, CSC_VP, CSC_HNUM, CSC_VNUM,
CSC_HINT and CSC_VINT. Make all settings in accordance with the specifications of the video signal
attempting to be displayed.
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