S3C44B0X

Manufacturer Part NumberS3C44B0X
DescriptionBGA
ManufacturerSamsung
S3C44B0X datasheets
 


Specifications of S3C44B0X

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LCD CONTROLLER
Gray Level Selection Guide
S3C2400X01LCD controller can generate 16 gray level using FRC(frame rate control). The FRC characteristics may
cause unexpected patterns in gray level. These unwanted erronous patterns may be shown in fast response LCD or
at lower frame rates.
Because the quality of LCD gray levels depends on LCD's own characteristics, the user has to select the good gray
levels after viewing all gray levels on user's own LCD.
Please select the gray level quality through the following procedures.
1. Get the latest dithering pattern register value from SAMSUNG.
2. Display 16gray bar in LCD.
3. Change the frame rate into an optimal value.
4. Change the VM alternating period to get the best quality.
5. As viewing 16 gray bars, select the good gray levels, which is displayed well on your LCD.
6. Use only the good gray levels for quality.
LCD Refresh Bus Bandwidth Calculation Guide
S3C2400X01LCD controller can supports various LCD display size. To select suitable LCD display size(for the flicker
free LCD system application), the user have to consider the LCD refresh bus bandwidth determined by LCD display
size, bit per pixel(bpp), frame rate, memory bus width, memory type and so on.
LCD Data Rate(Byte/s) = bpp x (Horizontal display size) x (Vertical display size) x (Frame rate) /8
LCD DMA Burst Count(Times/s) = LCD Data Rate(Byte/s) /16(Byte) ; LCD DMA using 4words(16Byte) burst
Pdma means LCD DMA access period. In other words, the value of Pdma is the period of four-beat burst(4-words
burst) for video data fetch. So, Pdma is determined by memory type and memory setting.
Eventually, LCD System Load is determined by LCD DMA Burst Count and Pdma.
LCD System Load = LCD DMA Burst Count x Pdma
Example 3 :
640 x 480, 8bpp, 60 frame/sec, 16-bit data bus width, SDRAM(Trp=2HCLK / Trcd=2HCLK / CL=2HCLK) and HCLK
frequency is 60 MHz
LCD Data Rate = 8
640
480
LCD DMA Burst Count = 18.432 / 16 = 1.152M/s
Pdma = (Trp+Trcd+CL+(2
4)+1)
LCD System Load = 1.152
250 = 0.288
System Bus Occupation Rate = (0.288/1)
15-36
60 / 8 = 18.432Mbyte/s
(1/60MHz) = 0.250ms
100 = 28.8%
S3C2400 RISC MICROPROCESSOR