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System Introduction 1-19
1.4.10 Video Memory
Table 1-15 Video RAM Configuration
Item Specification
DRAM or VRAM DRAM(EDO type)
Fixed or upgradeable Fixed
Memory size/configuration 1MB (256K x 16 x 2pcs)
Memory speed 60ns
Memory voltage 3.3V
Memory package TSOP
1.4.11 Video
Table 1-16 Video Hardware Specification
Item Specification
Video chip C&T65550B
Working voltage C&T65550B: 3.3V
C&T65550XX: 3.3V/5V (“XX” represents codes other than “A” (i.e. “B1”))
Video Chip substitutability Yes
During power-on, system supplies 5V to video chip and read its register to determine
whether the video chip is 5V or 3.3V/5V type. If 5V video chip is detected, system
maintains video voltage at 5V; if 3.3V/5V video chip is detected, system switches
video voltage to 3.3V.
1.4.11.1 External CRT Resolution Support
Table 1-17 Supported External CRT Resolutions
Resolution x Color on
External CRT
CRT Refresh Rate Simultaneous on
TFT LCD
Simultaneous on
STN LCD
CRT only Simultaneous SVGA SVGA
640x480x16 60,75,85 60 Y Y
640x480x256 60,75,85 60 Y Y
640x480x65,536 60,75,85 60 Y Y
640x480x16,777,216 60,75,85 60 Y N
800x600x16 56,60,75 60 Y Y
800x600x256 56,60,75 60 Y Y
800x600x65,536 56,60 60 Y N
1024x768x16 60,75,86I 60 Y Y
Table 1-17 Supported External CRT Resolutions (Continued)
Resolution x Color on
External CRT
CRT Refresh Rate Simultaneous on
TFT LCD
Simultaneous on
STN LCD
1024x768x256 60,75,86I 60 Y Y