Specifications

CM-X300 CoM
30 CM-X300 Reference Guide Rev 1.31 30-Dec-2010
bandwidth needed exceeds the total available memory bus bandwidth, visible video
artifacts may be seen on the LCD panel.
Bandwidth BusMemory SystemBandwidth LCD Bandwidth BusMemory Needed Total 
The number of pixel clocks to send one line of pixels is calculated using the following
equation:
1) (ELW 1) (PPL1) (BLW 1) (HSW
Line
sPixelClock

Or:
4ELWPPLBLWHSW
Line
sPixelClock

where:
 HSW = Horizontal Sync Width
 BLW = Beginning of Line Width
 PPL = Pixels Per Line (Frame width -1)
 ELW = End of Line width
The number of line clocks (HSYNC clocks) needed to send one frame is calculated using
the following equation:
EFW1) (LPPBFW1) (VSW
Frame
LineClocks

Or:
2EFWLPPBFWVSW
Frame
LineClocks

where:
 VSW = Vertical Sync Width
 BFW = Beginning of Frame Width
 LPP = Lines Per Page (Frame height – 1)
 EFW = End of Frame Width
The number of pixel clocks to send one frame is calculated using the following equation:
Line
sPixelClock
Frame
LineClocks
Frame
sPixelClock

substituting:
4)PPLELWBLW(HSW 2)EFWLPPBFW(VSW
Frame
sPixelClock

Because LPP = Height – 1 and PPL = Width – 1, the following equation applies:
3)WidthELWBLW(HSW 1)EFWHeightBFWVSW(
Frame
sPixelClock

The refresh rate, which is the number of frames per second that the LCD controller is
fetching from memory and sending to the LCD panel, can be calculated using the following
equation:






Frame
Clocks Pixel
FrequencyClock Pixel
= RateRefresh