Samsung S3C6400X User Manual page 387

S3C6400X RISC MICROPROCESSOR
The RGB_HSYNC and RGB_VSYNC signal is configured by VSYNC, VBPD, VFPD, HSYNC, HBPD, HFPD,
HOZVAL and LINEVAL. For more information refer to the Figure 14-8.
The frame rate is RGB_VSYNC signal frequency. The frame rate is related with the field of VSYNC, VBPD, VFPD,
LINEVAL, HSYNC, HBPD, HFPD, HOZVAL, CLKVAL registers. Most LCD driver requires their own adequate
frame rate. The frame rate is calculated as follows;
Frame Rate = 1/ [ { (VSPW+1) + (VBPD+1) + (LIINEVAL + 1) + (VFPD+1) } x {(HSPW+1) + (HBPD +1)
+ (HFPD+1) + (HOZVAL + 1) } x { ( CLKVAL+1 ) / ( Frequency of Clock source ) } ]
I80 CPU Interface Controller
VTIME_I80 controls Display Controller for cpu style LDI, and has the following functions.
Generation of I80 Interface Control Signals
CPU Style LDI Command Control
Timing Control for VDMA and VDPRCS
Output Control Signal Generation
SYS_CS0, SYS_CS1, SYS_WE and SYS_RS control signals are generated by VTIME_I80. (For more information
refer to Figure 14-9 for Timing Diagram). Their timing parameters, LCD_CS_SETUP, LCD_WR_SETUP,
LCD_WR_ACT, LCD_WR_HOLD can be set through I80IFCONA0 and I80IFCONA1 SFRs.
Partial Display Control
Although partial display is a main feature of cpu-style LDI, VTIME_I80 does not support this function in H/W logic.
However, this function can be implemented by SFR setting (LINEVAL, HOZVAL, OSD_LeftTopX_F,
OSD_LeftTopY_F, OSD_RightBotX_F, OSD_RightBotY_F, PAGEWIDTH, OFFSIZE).
LDI Command Control
LDI can receive command and data. Command refers to index for the selection of SFR in LDI. In control signal for
command and data, only SYS_RS signal has different operation. Generally, SYS_RS is polarity of '1' for
command issue and vice versa.
Display Controller has two kinds of command control. One is auto command and the other is normal command.
Auto command is issued automatically (i.e. without S/W control) at a predefined rate (rate = 2,4, 6 ..30. Rate = 4
means auto command are send to LDI at the end of every 4-image-frames). Normal command is issued by S/W
control.
Setting of Commands
Auto Command
For example, if 0x1(index), 0x32, 0x2(index), 0x8f, 0x4(index), 0x99 required to sent to LDI at every 10 frames,
the following steps are recommended
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
DISPLAY CONTROLLER
14-25