Section 24 Multimedia Card Interface (MMCIF)
Rev.1.00 Dec. 13, 2005 Page 901 of 1286
REJ09B0158-0100
24.4 Operation
The multimedia card is an external storage media that can be easily connected or disconnected.
The MMCIF operates in MMC mode.
Insert a card and supply power to it. Then operate the MMCIF by applying the transfer clock after
setting an appropriate transfer clock frequency.
Do not connect or disconnect the card during command sequence execution or in the data busy
state.
24.4.1
Operations in MMC Mode
MMC mode is an operating mode in which the transfer clock is output from the MCCLK pin,
command transmission/response receive occurs via the MCCMD pin, and data is
transmitted/received via the MCDAT pin. In this mode the next command can be issued while
data is being transmitted/received.
This feature is efficient for multiple block or stream transfer. In this case, the next command is the
CMD12 command, which aborts the current command sequence.
In MMC mode, broadcast commands that simultaneously issue commands to multiple cards are
supported. After information of the inserted cards is recognized by a broadcast command, a
relative address is given to each card. One card is selected by the relative address, other cards are
deselected, and then various commands are issued to the selected card.
Commands in MMC mode are basically classified into three types: broadcast, relative address, and
flash memory operation commands. The card can be operated by issuing these commands
appropriately according to the card state.
(1) Operation of Broadcast Commands
CMD0, CMD1, CMD2, and CMD4 are broadcast commands. These commands and the CMD3
command comprise a sequence assigning relative addresses to individual cards. In this sequence,
the CMD output format is open drain, and the command response is wired-OR. During the
issuance of this command sequence, the transfer clock frequency should be set to a sufficiently
low value.
Содержание SH7780 Series
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Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
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Страница 1070: ...Section 26 Serial Sound Interface SSI Module Rev 1 00 Dec 13 2005 Page 1020 of 1286 REJ09B0158 0100 ...
Страница 1104: ...Section 27 NAND Flash Memory Controller FLCTL Rev 1 00 Dec 13 2005 Page 1054 of 1286 REJ09B0158 0100 ...
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