MC56U032DCCA Datasheet, PDF(8/64 Page) Samsung semiconductor – Dual Voltage MultiMediaCard Specification

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MC56U032DCCA Datasheet, PDF (8/64 Pages) Samsung semiconductor – Dual Voltage MultiMediaCard Specification

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MultiMediaCardTM

further commands are received within 5 msec The host does not have to take any action for this to

occur. In most systems, the MultiMediaCard is in sleep mode except when the host is accessing it,

thus conserving power. When the host is ready to access the MultiMediaCard and it is in sleep mode,

any command issued to the MultiMediaCard will cause it to exit sleep and respond. The host does not

have to issue a reset first. It may do this if desired, but it is not needed. By not issuing the reset,

performance is improved through the reduction of overhead.

2.5 Hot Insertion

Support for hot insertion will be required on the host but will be supported through the connector.

Connector manufacturers will provide connectors that have power pins long enough to be powered

before contact is made with the other pins. Please see connector data sheets for more details. This

approach is similar to that used in PCMCIA to allow for hot insertion. This applies to both

MultiMediaCard and SPI modes.

2.6 MultiMediaCard Mode

2.6.1 MultiMediaCard Standard Compliance

The MultiMediaCard is fully compliant with MultiMediaCard standard specification V3.31.

The structure of the Card Specific Data (CSD) register is compliant with CSD structure V1.2.

2.6.2 Negotiating Operation Conditions

The MultiMediaCard supports the operation condition verification sequence defined in the

MultiMediaCard standard specifications. The MultiMediaCard host should define an operating voltage

range that is not supported by the MultiMediaCard. It will put itself in an inactive state and ignore any

bus communication. The only way to get the card out of the inactive state is by powering it down and

up again. In addition the host can explicitly send the card to the inactive state by using the

GO_INACTIVE_STATE command.

2.6.3 Card Acquisition and Identification

The MultiMediaCard bus is a single master (MultiMediaCard host) and multi-slaves (cards) bus. The

host can query the bus and find out how many cards of which type are currently connected. The

MultiMediaCardâs CID register is pre-programmed with a unique card identification number which is

used during the acquisition and identification procedure

In addition, the MultiMediaCard host can read the cardâs CID register using the READ_CID

MultiMediaCard command. The CID register is programmed during the MultiMediaCard testing and

formatting procedure, on the manufacturing floor. The MultiMediaCard host can only read this register

and not write to it.

2.6.4 Card Status

MultiMediaCard status is stored in a 32 bit status register which is sent as the data field in the card

respond to host commands. Status register provides information about the cardâs current state and

completion codes for the last host command. The card status can be explicitly read (polled) with the

SEND_STATUS command.

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