User's Manual
Table Of Contents
- S3C2450 User's Manual
- About this Document
- Table of Contents
- 01-Overview
- 02-SYSCON
- 1 OVERVIEW
- 2 FEATURE
- 3 BLOCK DIAGRAM
- 4 FUNCTIONAL DESCRIPTIONS
- 5 CLOCK MANAGEMENT
- 6 POWER MANAGEMENT
- 7 REGISTER DESCRIPTIONS
- 8 INDIVIDUAL REGISTER DESCRIPTIONS
- 8.1 CLOCK SOURCE CONTROL REGISTERS (LOCKCON0, LOCKCON1, OSCSET, MPLLCON, AND EPLLCON)
- 8.2 CLOCK CONTROL REGISTER (CLKSRC, CLKDIV, HCLKCON, PCLKCON, AND SCLKCON)
- 8.3 POWER MANAGEMENT REGISTERS (PWRMODE AND PWRCFG)
- 8.4 RESET CONTROL REGISTERS (SWRST AND RSTCON)
- 8.5 CONTROL OF RETENTION PAD(I/O) WHEN NORMAL MODE AND WAKE-UP FROM SLEEP MODE.
- 8.6 SYSTEM CONTROLLER STATUS REGISTERS (WKUPSTAT AND RSTSTAT)
- 8.7 BUS CONFIGURATION REGISTER (BUSPRI0, BUSPRI1, AND BUSMISC)
- 8.8 INFORMATION REGISTER 0,1,2,3
- 8.9 USB PHY CONTROL REGISTER (PHYCTRL)
- 8.10 USB PHY POWER CONTROL REGISTER (PHYPWR)
- 8.11 USB RESET CONTROL REGISTER (URSTCON)
- 8.12 USB CLOCK CONTROL REGISTER (UCLKCON)
- 03-MATRIX & EBI
- 04-Bus Priority
- 05-SMC
- 1 OVERVIEW
- 2 FEATURE
- 3 BLOCK DIAGRAM
- 4 SPECIAL REGISTERS
- 4.1 BANK IDLE CYCLE CONTROL REGISTERS 0-5
- 4.2 BANK READ WAIT STATE CONTROL REGISTERS 0-5
- 4.3 BANK WRITE WAIT STATE CONTROL REGISTERS 0-5
- 4.4 BANK OUTPUT ENABLE ASSERTION DELAY CONTROL REGISTERS 0-5
- 4.5 BANK WRITE ENABLE ASSERTION DELAY CONTROL REGISTERS 0-5
- 4.6 BANK CONTROL REGISTERS 0-5
- 4.7 BANK ONENAND TYPE SELECTION REGISTER
- 4.8 SMC STATUS REGISTER
- 4.9 SMC CONTROL REGISTER
- 06-DRAMC
- 1 OVERVIEW
- 2 BLOCK DIAGRAM
- 3 MOBILE DRAM INITIALIZATION SEQUENCE
- 3.1 MOBILE DRAM(SDRAM OR MOBILE DDR) INITIALIZATION SEQUENCE
- 3.2 DDR2 INITIALIZATION SEQUENCE
- 3.3 MOBILE DRAM CONFIGURATION REGISTER
- 3.4 MOBILE DRAM CONTROL REGISTER
- 3.5 MOBILE DRAM TIMMING CONTROL REGISTER
- 3.6 MOBILE DRAM (EXTENDED ) MODE REGISTER SET REGISTER
- 3.7 MOBILE DRAM REFRESH CONTROL REGISTER
- 3.8 MOBILE DRAM WRITE BUFFER TIME OUT REGISTER
- 07-Nand Flash
- 1 OVERVIEW
- 2 FEATURES
- 3 BLOCK DIAGRAM
- 4 BOOT LOADER FUNCTION
- 5 GPC5/6/7 PIN CONFIGURATION TABLE IN IROM BOOT MODE
- 6 NAND FLASH MEMORY TIMING
- 7 NAND FLASH ACCESS
- 8 DATA REGISTER CONFIGURATION
- 9 STEPPINGSTONE (8KB IN 64KB SRAM)
- 10 1BIT / 4BIT / 8BIT ECC (ERROR CORRECTION CODE)
- 11 MEMORY MAPPING(NAND BOOT AND OTHER BOOT)
- 12 NAND FLASH MEMORY CONFIGURATION
- 13 NAND FLASH CONTROLLER SPECIAL REGISTERS
- 13.1 NAND FLASH CONTROLLER REGISTER MAP
- 13.2 NAND FLASH CONFIGURATION REGISTER
- 13.3 CONTROL REGISTER
- 13.4 COMMAND REGISTER
- 13.5 ADDRESS REGISTER
- 13.6 DATA REGISTER
- 13.7 MAIN DATA AREA ECC REGISTER
- 13.8 SPARE AREA ECC REGISTER
- 13.9 PROGRMMABLE BLOCK ADDRESS REGISTER
- 13.10 NFCON STATUS REGISTER
- 13.11 ECC0/1 ERROR STATUS REGISTER
- 13.12 MAIN DATA AREA ECC0 STATUS REGISTER
- 13.13 SPARE AREA ECC STATUS REGISTER
- 13.14 4-BIT ECC ERROR PATTEN REGISTER
- 13.15 ECC 0/1/2 FOR 8BIT ECC STATUS REGISTER
- 13.16 8BIT ECC MAIN DATA ECC 0/1/2/3 STATUS REGISTER
- 13.17 8BIT ECC ERROR PATTERN REGISTER
- 08-CF controller
- 1 OVERVIEW
- 2 INDIVIDUAL REGISTER DESCRIPTIONS
- 2.1 MUX_REG REGISTER
- 2.2 PCCARD CONFIGURATION & STATUS REGISTER
- 2.3 PCCARD INTERRUPT MASK & SOURCE REGISTER
- 2.4 PCCARD_ATTR REGISTER
- 2.5 PCCARD_I/O REGISTER
- 2.6 PCCARD_COMM REGISTER
- 2.7 ATA_CONTROL REGISTER
- 2.8 ATA_STATUS REGISTER
- 2.9 ATA_COMMAND REGISTER
- 2.10 ATA_SWRST REGISTER
- 2.11 ATA_IRQ REGISTER
- 2.12 ATA_IRQ_MASK REGISTER
- 2.13 ATA_CFG REGISTER
- 2.14 ATA_PIO_TIME REGISTER
- 2.15 ATA_XFR_NUM REGISTER
- 2.16 ATA_XFR_CNT REGISTER
- 2.17 ATA_TBUF_START REGISTER
- 2.18 ATA_TBUF_SIZE REGISTER
- 2.19 ATA_SBUF_START REGISTER
- 2.20 ATA_SBUF_SIZE REGISTER
- 2.21 ATA_CADDR_TBUF REGISTER
- 2.22 ATA_CADDR_SBUF REGISTER
- 2.23 ATA_PIO_DTR REGISTER
- 2.24 ATA_PIO_FED REGISTER
- 2.25 ATA_PIO_SCR REGISTER
- 2.26 ATA_PIO_LLR REGISTER
- 2.27 ATA_PIO_LMR REGISTER
- 2.28 ATA_PIO_LMR REGISTER
- 2.29 ATA_PIO_DVR REGISTER
- 2.30 ATA_PIO_CSD REGISTER
- 2.31 ATA_PIO_DAD REGISTER
- 2.32 ATA_PIO_RDATA REGISTER
- 2.33 BUS_FIFO_STATUS REGISTER
- 2.34 ATA_FIFO_STATUS REGISTER
- 09-DMA controller
- 1 OVERVIEW
- 2 DMA REQUEST SOURCES
- 3 DMA OPERATION
- 4 DMA SPECIAL REGISTERS
- 4.1 DMA INITIAL SOURCE REGISTER (DISRC)
- 4.2 DMA INITIAL SOURCE CONTROL REGISTER (DISRCC)
- 4.3 DMA INITIAL DESTINATION REGISTER (DIDST)
- 4.4 DMA INITIAL DESTINATION CONTROL REGISTER (DIDSTC)
- 4.5 DMA CONTROL REGISTER (DCON)
- 4.6 DMA STATUS REGISTER (DSTAT)
- 4.7 DMA CURRENT SOURCE REGISTER (DCSRC)
- 4.8 CURRENT DESTINATION REGISTER (DCDST)
- 4.9 DMA MASK TRIGGER REGISTER (DMASKTRIG)
- 4.10 DMA REQUESET SELECTION REGISTER (DMAREQSEL)
- 10-Interrupt controller
- 1 OVERVIEW
- 2 INTERRUPT CONTROLLER SPECIAL REGISTERS
- 2.1 SOURCE PENDING (SRCPND) REGISTER
- 2.2 INTERRUPT MODE (INTMOD) REGISTER
- 2.3 INTERRUPT MASK (INTMSK) REGISTER
- 2.4 INTERRUPT PENDING (INTPND) REGISTER
- 2.5 INTERRUPT OFFSET (INTOFFSET) REGISTER
- 2.6 SUB SOURCE PENDING (SUBSRCPND) REGISTER
- 2.7 INTERRUPT SUB MASK (INTSUBMSK) REGISTER
- 2.8 PRIORITY MODE REGISTER (PRIORITY_MODE)
- 2.9 PRIORITY UPDATE REGISTER (PRIORITY_UPDATE)
- 11-IOport
- 1 OVERVIEW
- 2 PORT CONTROL DESCRIPTIONS
- 3 I/O PORT CONTROL REGISTER
- 3.1 PORT A CONTROL REGISTERS (GPACON, GPADAT)
- 3.2 PORT B CONTROL REGISTERS (GPBCON, GPBDAT, GPBUDP, GPBSEL)
- 3.3 PORT C CONTROL REGISTERS (GPCCON, GPCDAT, GPCUDP)
- 3.4 PORT D CONTROL REGISTERS (GPDCON, GPDDAT, GPDUDP)
- 3.5 PORT E CONTROL REGISTERS (GPECON, GPEDAT, GPEUDP, GPESEL)
- 3.6 PORT F CONTROL REGISTERS (GPFCON, GPFDAT, GPFUDP)
- 3.7 PORT G CONTROL REGISTERS (GPGCON, GPGDAT, GPGUDP)
- 3.8 PORT H CONTROL REGISTERS (GPHCON, GPHDAT, GPHUDP)
- 3.9 PORT J CONTROL REGISTERS (GPJCON, GPJDAT, GPJUDP, GPJSEL)
- 3.10 PORT K CONTROL REGISTERS (GPKCON, GPKDAT, GPKUDP)
- 3.11 PORT L CONTROL REGISTERS (GPLCON, GPLDAT, GPLUDP, GPLSEL)
- 3.12 PORT M CONTROL REGISTERS (GPMCON, GPMDAT, GPMUDP)
- 3.13 MISCELLANEOUS CONTROL REGISTER (MISCCR)
- 3.14 DCLK CONTROL REGISTERS (DCLKCON)
- 3.15 EXTINTn (External Interrupt Control Register n)
- 3.16 EINTFLTn (External Interrupt Filter Register n)
- 3.17 EINTMASK (External Interrupt Mask Register)
- 3.18 EINTPEND (External Interrupt Pending Register)
- 3.19 GSTATUSn (General Status Registers)
- 3.20 DSCn (Drive Strength Control)
- 3.21 PDDMCON (Power Down SDRAM Control Register)
- 3.22 PDSMCON (Power Down SRAM Control Register)
- 4 GPIO ALIVE & SLEEP PART
- 12-Watchdog
- 13-PWM Timer
- 1 OVERVIEW
- 2 PWM TIMER OPERATION
- 3 PWM TIMER CONTROL REGISTERS
- 3.1 TIMER CONFIGURATION REGISTER0 (TCFG0)
- 3.2 TIMER CONFIGURATION REGISTER1 (TCFG1)
- 3.3 TIMER CONTROL (TCON) REGISTER
- 3.4 TIMER 0 COUNT BUFFER REGISTER & COMPARE BUFFER REGISTER (TCNTB0/TCMPB0)
- 3.5 TIMER 0 COUNT OBSERVATION REGISTER (TCNTO0)
- 3.6 TIMER 1 COUNT BUFFER REGISTER & COMPARE BUFFER REGISTER (TCNTB1/TCMPB1)
- 3.7 TIMER 1 COUNT OBSERVATION REGISTER (TCNTO1)
- 3.8 TIMER 2 COUNT BUFFER REGISTER & COMPARE BUFFER REGISTER (TCNTB2/TCMPB2)
- 3.9 TIMER 2 COUNT OBSERVATION REGISTER (TCNTO2)
- 3.10 TIMER 3 COUNT BUFFER REGISTER & COMPARE BUFFER REGISTER (TCNTB3/TCMPB3)
- 3.11 TIMER 3 COUNT OBSERVATION REGISTER (TCNTO3)
- 3.12 TIMER 4 COUNT BUFFER REGISTER (TCNTB4)
- 3.13 TIMER 4 COUNT OBSERVATION REGISTER (TCNTO4)
- 14-RTC
- 15-UART
- 1 OVERVIEW
- 2 BLOCK DIAGRAM
- 3 UART SPECIAL REGISTERS
- 3.1 UART LINE CONTROL REGISTER
- 3.2 UART CONTROL REGISTER
- 3.3 UART FIFO CONTROL REGISTER
- 3.4 UART MODEM CONTROL REGISTER
- 3.5 UART TX/RX STATUS REGISTER
- 3.6 UART ERROR STATUS REGISTER
- 3.7 UART FIFO STATUS REGISTER
- 3.8 UART MODEM STATUS REGISTER
- 3.9 UART TRANSMIT BUFFER REGISTER (HOLDING REGISTER & FIFO REGISTER)
- 3.10 UART RECEIVE BUFFER REGISTER (HOLDING REGISTER & FIFO REGISTER)
- 3.11 UART BAUD RATE DIVISOR REGISTER
- 3.12 UART DIVIDING SLOT REGISTER
- 16-USB HOST Controller
- 17-USB 2.0 Device
- 1 OVERVIEW
- 2 BLOCK DIAGRAM
- 3 TO ACTIVATE USB PORT1 FOR USB 2.0 FUNCTION
- 4 SIE (SERIAL INTERFACE ENGINE)
- 5 UPH (UNIVERSAL PROTOCOL HANDLER)
- 6 UTMI (USB 2.0 TRANSCEIVER MACROCELL INTERFACE)
- 7 USB 2.0 FUNCTION CONTROLLER SPECIAL REGISTERS
- 8 REGISTERS
- 8.1 INDEX REGISTER (IR)
- 8.2 ENDPOINT INTERRUPT REGISTER (EIR)
- 8.3 ENDPOINT INTERRUPT ENABLE REGISTER (EIER)
- 8.4 FUNCTION ADDRESS REGISTER (FAR)
- 8.5 ENDPOINT DIRECTION REGISTER (EDR)
- 8.6 TEST REGISTER (TR)
- 8.7 SYSTEM STATUS REGISTER (SSR)
- 8.8 SYSTEM CONTROL REGISTER (SCR)
- 8.9 EP0 STATUS REGISTER (EP0SR)
- 8.10 EP0 CONTROL REGISTER (EP0CR)
- 8.11 ENDPOINT# BUFFER REGISTER (EP#BR)
- 8.12 ENDPOINT STATUS REGISTER (ESR)
- 8.13 ENDPOINT CONTROL REGISTER (ECR)
- 8.14 BYTE READ COUNT REGISTER (BRCR)
- 8.15 BYTE WRITE COUNT REGISTER (BWCR)
- 8.16 MAX PACKET REGISTER (MPR)
- 8.17 DMA CONTROL REGISTER (DCR)
- 8.18 DMA TRANSFER COUNTER REGISTER (DTCR)
- 8.19 DMA FIFO COUNTER REGISTER (DFCR)
- 8.20 DMA TOTAL TRANSFER COUNTER REGISTER 1/2 (DTTCR 1/2)
- 8.21 DMA INTERFACE CONTROL REGISTER (DICR)
- 8.22 MEMORY BASE ADDRESS REGISTER (MBAR)
- 8.23 MEMORY CURRENT ADDRESS REGISTER (MCAR)
- 8.24 BURST FIFO CONTROL REGISTER(FCON)
- 8.25 BURST FIFO STATUS REGISTER(FSTAT)
- 8.26 AHB MASTER(DMA) OPERATION FLOW CHART
- 18-IIC bus interface
- 19-2D
- 20-HSSPI
- 21-HSMMC
- 1 OVERVIEW
- 2 FEATURES
- 3 BLOCK DIAGRAM
- 4 SEQUENCE
- 4.1 SD CARD DETECTION SEQUENCE
- 4.2 SD CLOCK SUPPLY SEQUENCE
- 4.3 SD CLOCK STOP SEQUENCE
- 4.4 SD CLOCK FREQUENCY CHANGE SEQUENCE
- 4.5 SD BUS POWER CONTROL SEQUENCE
- 4.6 CHANGE BUS WIDTH SEQUENCE
- 4.7 TIMEOUT SETTING FOR DAT LINE
- 4.8 SD TRANSACTION GENERATION
- 4.9 SD COMMAND ISSUE SEQUENCE
- 4.10 COMMAND COMPLETE SEQUENCE
- 4.11 TRANSACTION CONTROL WITH DATA TRANSFER USING DAT LINE
- 4.12 ABORT TRANSACTION
- 5 SDI SPECIAL REGISTERS
- 5.1 CONFIGURATION REGISTER TYPES
- 5.2 SDMA SYSTEM ADDRESS REGISTER
- 5.3 BLOCK SIZE REGISTER
- 5.4 BLOCK COUNT REGISTER
- 5.5 ARGUMENT REGISTER
- 5.6 TRANSFER MODE REGISTER
- 5.7 COMMAND REGISTER
- 5.8 RESPONSE REGISTER
- 5.9 BUFFER DATA PORT REGISTER
- 5.10 PRESENT STATE REGISTER
- 5.11 HOST CONTROL REGISTER
- 5.12 POWER CONTROL REGISTER
- 5.13 BLOCK GAP CONTROL REGISTER
- 5.14 WAKEUP CONTROL REGISTER
- 5.15 CLOCK CONTROL REGISTER
- 5.16 TIMEOUT CONTROL REGISTER
- 5.17 SOFTWARE RESET REGISTER
- 5.18 NORMAL INTERRUPT STATUS REGISTER
- 5.19 ERROR INTERRUPT STATUS REGISTER
- 5.20 NORMAL INTERRUPT STATUS ENABLE REGISTER
- 5.21 ERROR INTERRUPT STATUS ENABLE REGISTER
- 5.22 NORMAL INTERRUPT SIGNAL ENABLE REGISTER
- 5.23 ERROR INTERRUPT SIGNAL ENABLE REGISTER
- 5.24 AUTOCMD12 ERROR STATUS REGISTER
- 5.25 CAPABILITIES REGISTER
- 5.26 MAXIMUM CURRENT CAPABILITIES REGISTER
- 5.27 CONTROL REGISTER 2
- 5.28 CONTROL REGISTER 3
- 5.29 DEBUG REGISTER
- 5.30 CONTROL REGISTER 4
- 5.31 FORCE EVENT REGISTER FOR AUTO CMD12 ERROR STATUS
- 5.32 FORCE EVENT REGISTER FOR ERROR INTERRUPT STATUS
- 5.33 ADMA ERROR STATUS REGISTER
- 5.34 ADMA SYSTEM ADDRESS REGISTER
- 5.35 HOST CONTROLLER VERSION REGISTER
- 22-LCD controller
- 23-Camera Interface
- 1 OVERVIEW
- 2 EXTERNAL INTERFACE
- 3 EXTERNAL/INTERNAL CONNECTION GUIDE
- 4 CAMERA INTERFACE OPERATION
- 5 SOFTWARE INTERFACE
- 6 CAMERA INTERFACE SPECIAL REGISTERS
- 6.1 SOURCE FORMAT REGISTER
- 6.2 WINDOW OPTION REGISTER
- 6.3 GLOBAL CONTROL REGISTER
- 6.4 WINDOW OPTION REGISTER 2
- 6.5 Y1 START ADDRESS REGISTER
- 6.6 Y2 START ADDRESS REGISTER
- 6.7 Y3 START ADDRESS REGISTER
- 6.8 Y4 START ADDRESS REGISTER
- 6.9 CB1 START ADDRESS REGISTER
- 6.10 CB2 START ADDRESS REGISTER
- 6.11 CB3 START ADDRESS REGISTER
- 6.12 CB4 START ADDRESS REGISTER
- 6.13 CR1 START ADDRESS REGISTER
- 6.14 CR2 START ADDRESS REGISTER
- 6.15 CR3 START ADDRESS REGISTER
- 6.16 CR4 START ADDRESS REGISTER
- 6.17 CODEC TARGET FORMAT REGISTER
- 6.18 CODEC DMA CONTROL REGISTER
- 6.19 REGISTER SETTING GUIDE FOR CODEC SCALER AND PREVIEW SCALER
- 6.20 CODEC PRE-SCALER CONTROL REGISTER 1
- 6.21 CODEC PRE-SCALER CONTROL REGISTER 2
- 6.22 CODEC MAIN-SCALER CONTROL REGISTER
- 6.23 CODEC DMA TARGET AREA REGISTER
- 6.24 CODEC STATUS REGISTER
- 6.25 RGB1 START ADDRESS REGISTER
- 6.26 RGB2 START ADDRESS REGISTER
- 6.27 RGB3 START ADDRESS REGISTER
- 6.28 RGB4 START ADDRESS REGISTER
- 6.29 PREVIEW TARGET FORMAT REGISTER
- 6.30 PREVIEW DMA CONTROL REGISTER
- 6.31 PREVIEW PRE-SCALER CONTROL REGISTER 1
- 6.32 PREVIEW PRE-SCALER CONTROL REGISTER 2
- 6.33 PREVIEW MAIN-SCALER CONTROL REGISTER
- 6.34 PREVIEW DMA TARGET AREA REGISTER
- 6.35 PREVIEW STATUS REGISTER
- 6.36 IMAGE CAPTURE ENABLE REGISTER
- 6.37 CODEC CAPTURE SEQUENCE REGISTER
- 6.38 CODEC SCAN LINE OFFSET REGISTER
- 6.39 PREVIEW SCAN LINE OFFSET REGISTER
- 6.40 IMAGE EFFECTS REGISTER
- 6.41 MSDMA Y START ADDRESS REGISTER
- 6.42 MSDMA CB START ADDRESS REGISTER
- 6.43 MSDMA CR START ADDRESS REGISTER
- 6.44 MSDMA Y END ADDRESS REGISTER
- 6.45 MSDMA CB END ADDRESS REGISTER
- 6.46 MSDMA CR END ADDRESS REGISTER
- 6.47 MSDMA Y OFFSET REGISTER
- 6.48 MSDMA CB OFFSET REGISTER
- 6.49 MSDMA CR OFFSET REGISTER
- 6.50 MSDMA SOURCE IMAGE WIDTH REGISTER
- 6.51 MSDMA CONTROL REGISTER
- 24-TSADC
- 25-IIS Interface
- 26-IIS Multi Audio Interface
- 27-AC97 Controller
- 1 OVERVIEW
- 2 AC97 CONTROLLER OPERATION
- 3 OPERATION FLOW CHART
- 4 AC-LINK DIGITAL INTERFACE PROTOCOL
- 5 AC97 POWER-DOWN
- 6 CODEC RESET
- 7 AC97 CONTROLLER STATE DIAGRAM
- 8 AC97 CONTROLLER SPECIAL REGISTERS
- 8.1 AC97 SPECIAL FUNCION REGISTER SUMMARY
- 8.2 AC97 GLOBAL CONTROL REGISTER (AC_GLBCTRL)
- 8.3 AC97 GLOBAL STATUS REGISTER (AC_GLBSTAT)
- 8.4 AC97 CODEC COMMAND REGISTER (AC_CODEC_CMD)
- 8.5 AC97 CODEC STATUS REGISTER (AC_CODEC_STAT)
- 8.6 AC97 PCM OUT/IN CHANNEL FIFO ADDRESS REGISTER (AC_PCMADDR)
- 8.7 AC97 MIC IN CHANNEL FIFO ADDRESS REGISTER (AC_MICADDR)
- 8.8 AC97 PCM OUT/IN CHANNEL FIFO DATA REGISTER (AC_PCMDATA)
- 8.9 AC97 MIC IN CHANNEL FIFO DATA REGISTER (AC_MICDATA)
- 28-PCM Audio Interface
- 1 OVERVIEW
- 2 PCM AUDIO INTERFACE
- 3 PCM TIMING
- 3.1 PCM INPUT CLOCK DIAGRAM
- 3.2 PCM REGISTERS
- 3.3 PCM REGISTER SUMMARY
- 3.4 PCM CONTROL REGISTER
- 3.5 PCM CLK CONTROL REGISTER
- 3.6 THE PCM TX FIFO REGISTER
- 3.7 PCM RX FIFO REGISTER
- 3.8 PCM INTERRUPT CONTROL REGISTER
- 3.9 PCM INTERRUPT STATUS REGISTER
- 3.10 PCM FIFO STATUS REGISTER
- 3.11 PCM INTERRUPT CLEAR REGISTER
- 29-ELECTRICAL DATA
- 30-MECHANICAL DATA
S3C2450X RISC MICROPROCESSOR 2D
19-13
4.6 ALPHA BLENDING
Alpha Blending combines the source color and the destination color in the frame buffer to get the new destination
color.
The conventional alpha blending equation is: final data = src * alpha + dest * (1.0 − alpha). 2D uses 8-bit integer to
represent the alpha value, with 0 indicating 1/256 and 255 indicating 1.0. The equation of converting 8-bit ALPHA
value to the actual fractional alpha value is: alpha = (ALPHA+1) / 256.
The internal computation of alpha blending and fading is as follows:
User-specified alpha value: ALPHA (given by ALPHA_REG, from 0 to 255)
[Alpha Blending]
data = ( source * (ALPHA+1) + destination * (255-ALPHA) ) >> 8
[Fading]
data = (( source * (ALPHA+1) ) >> 8) + fading offset
Per-pixel alpha blending: ALPHA (given by the source image, from 0 to 255)
[Alpha Blending]
data = ( source * (ALPHA+1) + destination * (255-ALPHA) ) >> 8
[Fading]
data = ((source * (ALPHA+1) ) >> 8 ) + fading offset
4.6.1 Related Registers
ROP_REG
Alpha blending configurations: alpha blending disable/enable, per-pixel alpha
blending disable/enable, fading disable/enable.
ALPHA_REG Alpha value and fading value.