PCI7420 datasheet(51/248 Pages) TI

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MMC cards, like SmartMedia cards, are also used in many types of consumer electronic devices. Because of their

small size, they are primarily used in portable music players and phones.

3.5.2

Secure Digital (SD)

SD cards are the same size as MMC cards, except for the thickness, which at 2,1 mm is slightly thicker than an MMC

card. SD cards are based upon MMC cards, with the addition of two terminals. The use of these two terminals and

a reserved terminal on MMC cards allows the data bus on SD cards to be up to 4 bits wide instead of the 1-bit width

of the MMC data bus. SD cards can communicate in either SD mode or SPI mode.

The voltage range for basic communication with SD cards is 2.0 to 3.6 V, and the voltage range for other commands

and memory access is 2.7 to 3.6 V. SD cards can be read-only or read/write.

SD is essentially a superset of MMC, in that MMC cards work in SD systems, but SD cards do not work in current

MMC systems. Unlike MMC, each SD card in a system must have a dedicated bus. One of the primary benefits of

SD cards is the added security that they provide. SD cards comply with the highest security of SDMI, have built-in

write-protect features, and include a mechanical write-protect switch.

SD cards are used in many of the same devices as MMC cards. The additional security features of the SD cards also

allow their use in more-secure applications or in devices where content protection is essential.

3.5.3

Memory Stick/MS-Pro

Memory Stick cards are about the size of a stick of gum and are 2,8 mm thick. Developed by Sony, Memory Stick

cards have a 10-terminal interface of which three terminals are used for serial communication, two terminals apply

power, two terminals are ground, one terminal is for insertion detection, and two terminals are reserved for future use.

Each card also includes an erasure-prevention switch to protect data stored on the card.

The voltage range for Memory Stick cards is 2.7 to 3.6 V, and the clock speed can be up to 20 MHz. Memory Stick

cards use the FAT file system to allow for easy communication with PCs.

There are two types of Memory Stick cards, the standard Memory Stick and the MagicGate Memory Stick. MagicGate

technology provides security to Memory Stick cards so that they can be used to store and protect copyrighted data.

Memory Stick cards are primarily used to store still images, moving images, voice, and music. As such, they are used

in a variety of devices, including portable music players, digital cameras, and digital picture frames.

3.5.4

Smart Card

Smart Cards, also called integrated circuit cards or ICCs, are the same size as a credit card, and they contain an

embedded microprocessor chip. Smart Cards can either have contacts or be contactless. In addition, there are both

asynchronous and synchronous versions of Smart Cards with contacts. Within this data manual, all uses of the term

Smart Card refers only to asynchronous Smart Cards with contacts.

Smart Cards contain eight contacts; however, two of the contacts are reserved for future use and are not included

in the UltraMedia interface. Smarts Cards can be either 5-V or 3-V cards; however, all 3-V cards are designed to work

also at 5 V.

The primary use of Smart Cards is in security-related applications. They are also used in credit cards, debit systems,

and identification systems.

3.6

PC Card Applications

The PCI7x20 device supports all the PC Card features and applications as described below.

•

Card insertion/removal and recognition per the PC Card Standard (release 8.0)

•

Speaker and audio applications

•

LED socket activity indicators

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