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HSMMC CONTROLLER
S3C2416X RISC MICROPROCESSOR
20-4
4.2 SD CLOCK SUPPLY SEQUENCE
START
Calculate a divisor for SD Clock frequency
Set SDCLK frequency select and
Internal Clock Enable
Check Internal Clock
Enable
Set SD Clock ON
End
(1)
(2)
(3)
(4)
Figure 20-3. SD Clock Supply Sequence
The sequence for supplying SD Clock to a SD card is described in Figure 20-3. The clock shall be supplied to the
card before either of the following actions is taken.
a) Issuing a SD command
b) Detect an interrupt from a SD card in 4-bit mode.
(1) Calculate a divisor to determine SD Clock frequency by reading Base Clock Frequency for SD Clock in the
Capabilities register. If Base Clock Frequency for SD Clock is 00 0000b, the Host System shall provide this
information to the Host Driver by another method.
(2) Set Internal Clock Enable(ENINTCLK) and SDCLK Frequency Select in the Clock Control register in
accordance with the calculated result of step (1).
(3) Check Internal Clock Stable(STBLINTCLK) in the Clock Control register. Repeat this step until Clock Stable is
1.
(4) Set SD Clock Enable(ENSDCLK) in the Clock Control register to 1. Then, the Host Controller starts to supply
the SD Clock.
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 ...