HSMMC CONTROLLER
S3C2416X RISC MICROPROCESSOR
20-6
4.5 SD BUS POWER CONTROL SEQUENCE
START
Get the support voltage of the
Host Controller
Set SD Bus voltage select with
supported maximum voltage
Set SD Bus Power
Get OCR value of the SD Card
SD Bus voltage
changed ?
Clr SD Bus Power
Set SD Bus voltage select
Set SD Bus Power
END
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
change
no change
Figure 20-6. SD Bus Power Control Sequence
The sequence for controlling the SD Bus Power is described in Figure 20-6.
(1) By reading the Capabilities register, get the support voltage of the Host Controller.
(2) Set SD Bus Voltage Select in the Power Control register with maximum voltage that the Host Controller
supports.
(3) Set SD Bus Power(PWRON) in the Power Control register to 1.
(4) Get the OCR value of all function internal of SD card.
(5) Judge whether SD Bus voltage needs to be changed or not. In case where SD Bus voltage needs to be
changed, go to step (6). In case where SD Bus voltage does not need to be changed, go to ‘End’.
(6) Set SD Bus Power in the Power Control register to 0 for clearing this bit. The card requires voltage rising from
0 volt to detect it correctly. The Host Driver shall clear SD Bus Power before changing voltage by setting SD
Bus Voltage Select.
(7) Set SD Bus Voltage Select(SELPWRLVL) in the Power Control register.
(8) Set SD Bus Power(PWRON) in the Power Control register to 1.
NOTE:
Step (2) and step (3) can be executed at same time. And also, step (7) and step (8) can be executed at same time.
Содержание S3C2416
Страница 33: ...S3C2416X RISC MICROPROCESSOR PRODUCT OVERVIEW 1 5 3 BLOCK DIAGRAM Figure 1 1 S3C2416X Block Diagram ...
Страница 38: ...PRODUCT OVERVIEW S3C2416X RISC MICROPROCESSOR 1 10 153 AIN 1 U14 195 EINT 10 GPG2 K15 237 SDATA 14 C18 ...
Страница 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Страница 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Страница 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Страница 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Страница 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Страница 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Страница 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Страница 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Страница 455: ...S3C2416X RISC MICROPROCESSOR HSMMC CONTROLLER 20 9 4 9 SD COMMAND ISSUE SEQUENCE Figure 20 9 Timeout Setting Sequence ...
Страница 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Страница 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Страница 653: ...S3C2416X RISC MICROPROCESSOR ELECTRICAL DATA 26 15 Figure 26 14 SDRAM READ WRITE Timing Trp 2 Trcd 2 Tcl 2 DW 16 bit ...
Страница 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...
Страница 672: ...MECHANICAL DATA S3C2416X RISC MICROPROCESSOR 30 2 Figure 27 2 330 FBGA 1414 Package Dimension 2 Bottom View ...