Sushma rawal 12 sd io card an sdio card is a

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SUSHMA RAWAL 12 SD I/O card An SDIO card is a combination of an SD card and an I/O device. Devices that support SDIO can use small devices designed for the SD form factor. When an SDIO card is inserted into a non SDIO-aware host , it will cause no physical damage or disruption to device or host controller. In this case, the SDIO card should simply be ignored .
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SUSHMA RAWAL 13 SD I/O card Once inserted into an SDIO aware host , the card is detected . During the normal initialization and interrogation of the card by the host, the card identifies itself as an SDIO card. The host software then obtains the card information determines if that card’s I/O function(s) are acceptable to activate. This decision is based on parameters like power requirements or the availability of appropriate software drivers. If the card is acceptable, it is allowed to power up fully and start the I/O function(s) built into it.
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SUSHMA RAWAL 14 SD I/O Signals
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SUSHMA RAWAL 15 SDIO Vs SD Memory Most of the SD Memory commands are supported in SDIO. SDIO cards can contain 8 separate logical cards.Upto7 I/O functions and 1 memory function can be supported on one card. SD slots will take SD cards only. SDIO slots will take SD cards and SDIO cards. SPI bus topology is mandatory for SDIO, unlike SD Memory. SDIO form factors:Fullsize SDIO and miniSDIO
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SUSHMA RAWAL 16 Types of SD I/O cards Full speed SDIO card SPI 1-bit SD 4-bit SD Clock Speed 0 –25Mhz Data transfer rates(over10MB/sec ) Low speed SDIO card SPI 1-bit SD Clock speed 0 –400Khz Combo cards: Full speed and 4-bit mode mandatory.
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SUSHMA RAWAL 17 SDIO –Application Specs. Associated with the base SDIO specification, there are several Application Specifications for Standard SDIO Functions. These common functions such as cameras, Bluetooth cards and GPS receivers have a standard register interface, a common operation method and a standard CIS extension. Implementation of the standard interfaces are optional for any card vendor.
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SUSHMA RAWAL 18 SDIO Modes SDIO Card and Host modes SPI mode 1 bit mode 4 bit mode SDIO only card Does not support memory commands like erase command.
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SUSHMA RAWAL 19 SD commands –Combo card SD Memory and I/O combo card Several commands of SD memory section is different from that of the I/O section of the card.
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