SDI Technologies SDIO Card Benutzerhandbuch
©Copyright 2000-2007 SD Card Association
SDIO Simplified Specification Version 2.00
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Figure 3-9 shows the equivalent command flow to re-initialize the memory controller of a Combo card. The RCA
value of xxxxh denotes an RCA value of either 0x0000 or the prior RCA value. For new controller designs, a
reset value of 0x0000 is recommended. The important fact for the host designer to note is that the host shall not
issue any commands except for CMD0, ACMD41 (with RCA=0x0000), CMD2, CMD3 or CMD7 to the Combo
Card until the memory controller has transitioned to the tran state.
3.4.5
Enabling CRC in SPI Combo Card
When receiving CMD59, Combo cards shall synchronize CRC enable in both SDIO and memory portions of the
card. If a host enables CRC using CMD59 and subsequently re-initializes either the I/O or memory controller,
the CRC for that controller will be off by default and the host shall issue a CMD59 to re-enable CRC. When
CMD59 is received, Combo Cards return the R1 response token while SDIO only cards return the modified R1
response token.
card. If a host enables CRC using CMD59 and subsequently re-initializes either the I/O or memory controller,
the CRC for that controller will be off by default and the host shall issue a CMD59 to re-enable CRC. When
CMD59 is received, Combo Cards return the R1 response token while SDIO only cards return the modified R1
response token.