F
VP_PCLK
* bits_per_pixel = F
TxByteClkHS
* NDL * 8
dss-310
(HSA
DISPC
+ HFP
DISPC
+ PPL + HBP
DISPC
) * T
VP_PCLK
= (4/NDL + HFP
DSI
+ (WC + 6)/NDL + HBP
DSI
)* T
TxByteClkHS
dss-303
HFP
DSI
= ((HFP
DISPC
* bits_per_pixel) / (NDL * 8)) - (2 / NDL)
dss-309
REGN = (F
/ F ) – 1
DSI_PLL_REFCLK
int
REGN = 12
REGM = (REGN+1)*F
/ (2 *
)
CLKIN4DDR
F
DSI_PLL_REFCLK
REGM = 150
dss-318
Frame rate = F
/ (HSA
+ HFP
+ PPL + HBP
) *
DISPC
VP_PCLK
DISPC
DISPC
DISPC
DISPC
DISPC
(VSA
+ VFP
+ LPP+ VBP
)
Frame rate = 12,5 MHz / (540 ) * (646 )
Frame rate = 35,83 frame/sec
dss-323
T
= T
/ 16 = T
/ ((REGM3 + 1) * LCD * PCD)
CLKIN4DDR
TxByteClkHS
VP_PCLK
((REGM3 + 1) * LCD * PCD) = 16 * 3
dss-315
Public Version
Display Subsystem Use Cases and Tips
www.ti.com
To synchronize DISPC and DSI Protocol Engine, users should follow the ratio T between TxByteClkHS
and VP_PCLK as listed in
Table 7-83. Ratio R
Number of data lanes
Pixel format
Ratio R
1
16-bits pixel
1/2
1
18-bits pixel
4/9
1
24-bits pixel
1/3
2
16-bits pixel
1
2
18-bits pixel
8/9
2
24-bits pixel
2/3
All cases are covered by:
Equation 3
(26)
Equation 4
(27)
Example
The desired performances are:
•
Clock lane at 150 MHz
•
RGB24-888
•
1-data lane
•
LCD size 480*640 with HSA
_DISP
= HFP
_DISP
= HBP
_DISP
=20, VSA
_DISP
= VFP
_DISP
= VBP
_DISP
=2
Step 1.
Determine REGM and REGN
To obtain correct stability, Fint must be kept between 0.75 MHz and 2.1 MHz. In this case, Fint is
maintained at 2 MHz. For more information, see the DSI PLL programming model.
Where DSS2_ALWON_FCLK= 26 MHz is used as a reference clock for F
DSI_PLL_REFCLK
Step 2.
Determine VP_PCLK and TxByteClkHS clocks.
TxByteClkHS frequency is equal to 37.5 MHz. With ratio R equal to 1/3, VP_PCLK frequency is equal
to 12,5 MHz. The frame rate can be estimated by:
Step 3.
Determine LCD, PCD and REGM3
1794
Display Subsystem
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
Страница 174: ...174 List of Tables SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 692: ...692 MPU Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1084: ...1084 IVA2 2 Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1990: ...1990 2D 3D Graphics Accelerator SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2334: ...2334 Memory Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2700: ...2700 Memory Management Units SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3462: ...3462 MMC SD SDIO Card Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3508: ...3508 General Purpose Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3584: ...3584 Initialization SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3648: ...3648 Debug and Emulation SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...