Eurotech EmbeddedDNA An0031, Руководство пользователя

Страница: 12 / 16

12 Application Note
CPU-1232 BIOS Flat Panel parameters
This is a brief description of the fields that can be modified in the BIOS Setup their default value:
Field Description
Default
Value
Disabled Disabled
Custom Custom parameters
Hitachi 800x600 (38MHz)
LG 800x600 (38MHz)
NEC 800x600 (38MHz)
Type
Sharp 800x600 (40MHz)
Disabled
640x480
800x600 Resolution
1024x768
Select the proper graphical
resolution
640x480
Dot Clock (MHz) Dot Clock Frequency in MHz 0
HSync FP
Front Porch - Horizontal Sync :
This Value must be recognized from the TFT Display Data-
Sheet.
0
HSync AT Active Time - Horizontal Sync 0
HSync BP Back Porch - Horizontal Sync 0
VSync FP Front Porch - Vertical Sync 0
VSync AT Active Time - Vertical Sync 0
VSync BP Back Porch - Vertical Sync 0
Table 5. BIOS Flat Panel Options
To insert the correct parameters, the user should refer to the information contained into the TFT-LCD
datasheet to which you want to connect.
Sometimes, when running CRT and TFT video at the same time, the image shown on the CRT could appear
rescaled and shifted. This happens because the parameters inserted for the TFT interface also modifies the
CRT visualization.
Defining CPU-1232 BIOS Parameters
As previously mentioned, to enter the proper parameters into the Flat Panel BIOS settings, the user should
refer to the TFT-LCD datasheet.
In Table 6 is shown an example of a timing table referring to a 640x480 TFT-LCD.