CXD3526GG 查看數據表（PDF） - Sony Semiconductor

零件编号

产品描述 (功能)

生产厂家

CXD3526GG

Digital Signal Driver/Timing Generator

Sony Semiconductor 

CXD3526GG

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 serial 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 odd 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

Vertical blanking period

Gamma RAM access

0

—

Yes

1

Vertical blanking period

Yes

1

Outside vertical blanking period

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

Vertical blanking period

Color shading RAM access

0

—

Yes

1

Vertical blanking period

Yes

1

Outside vertical blanking period

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 EEPROM transfer count register ROM_TRAN to fit within the vertical blanking period.

Furthermore, the vertical blanking period for gamma is set using GAM_H1, GAM_H2, GAM_V1 and GAM_V2,

while the vertical blanking period for color shading 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.

– 17 –

Share Link: