SanDisk SD032, SD128, SD-ROM, SD064 User Manual

SanDisk SD-ROM Product Manual

Revision 1.0

SanDisk Corporation

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Other U.S. and foreign patents awarded and pending.

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1 SD-ROM Card Overview

1.1 Introduction

SanDisk SD-ROM Cards provide permanent and secure read-only data storage for consumer
electronic and personal computer applications. SanDisk SD-ROM Cards are based on
SanDisk’s unique 3D one-time programmable (OTP) memory devices which safely store data
for 100 years. This compares favorably with cards based on flash memory devices, which are
typically rated to store data for 10 years or less. And unlike cards based on mask ROM memory
devices, SanDisk SD-ROM Cards can be programmed immediately before shipping to end­users or retail storefronts, reducing order turn time and inventory requirements.

SanDisk SD-ROM Cards are compatible with the Secure Digital memory card specifications,
with some modifications to maximize host device compatibility. Matsushita Electric Industrial Co.
Ltd., SanDisk Corporation and Toshiba Corporation (SD-3C, LLC) originally defined
specifications for the SD Card. SD card specifications are now maintained, controlled and
assigned by the SD-3C, LLC. While a formal SD-ROM card specification does not yet exist, the
SanDisk SD ROM Card has been designed to be compatible with most SD host devices today.

SanDisk SD-ROM Cards implement the 9-pin SD card interface and support a maximum
operating frequency of 25 MHz and an operating voltage range of 2.7 – 3.6v. The industry­standard SD interface allows for easy integration into any design, regardless of which type of
microprocessor is used. In addition to the SD interface, the SanDisk SD-ROM Card interface
offers an alternate communication protocol based on the SPI standard. With some additions,
the physical form factor, pin assignment, and data transfer protocol are forward compatible with
current and future SanDisk SD Card products.

SanDisk SD-ROM Cards are available in 32, 64, and 128 megabyte (MB) capacities.

1.2 Feature Summary

General features of SanDisk SD-ROM Cards include:

• Archival data storage with over 100 year data storage lifetime

• Convenient form-factor, ideal for portable and stationary applications for content storage

• Card capacities of 32, 64, and 128MB

• Supports industry-standard SD and SPI interfaces

• Voltage range of 2.7 to 3.6V

• Variable clock rate of 0 - 25 MHz

1.3 SD Card Standard

SanDisk SD-ROM Cards are compatible with the SDA Physical Layer Specification, Version

2.00. This specification is available from the SD Card Association (SDA).
SD Card Association 2400 Camino Ramon, Suite 375 San Ramon, CA 94583 USA Telephone:

[phone] Fax: [phone] E-mail: [e-mail] Web site:
www.sdcard.org

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2 SanDisk SD-ROM Card Functional Description

SanDisk SD-ROM Cards are compatible with the SD specifications, with some changes
necessary for a read-only memory.

In an SD host system, the host controls all communication between itself and the cards. For
detailed information, refer to Section 4 of the SDA Physical Layer Specification, Version 2.00.

This chapter contains the functional description for SanDisk SD-ROM Cards.

2.1 SD Bus Protocol

Communication over the SD bus is based on command and data-bit streams initiated by a start
bit and terminated by a stop bit. See Section 3.6.1 of the SDA Physical Layer Specification,
Version 2.00, for details.

2.2 SPI Mode

The SPI Mode is a secondary communication protocol for cards in the SanDisk SD-ROM Cards.
This interface mode is an alternate to the SD protocol and is designed to communicate with an
SPI channel, commonly found in Motorola and other vendors' microcontrollers. More
information about SPI Mode can be found in Section 7 of the SDA Physical Layer Specification,
Version 2.00.

2.3 Cyclic Redundancy Codes

Cyclic Redundancy Codes (CRC) protect against transmission errors that may occur on the bus
in SD systems. Detailed information and examples for CRC7 and CRC16 are provided in
Section 4.5 of the SDA Physical Layer Specification, Version 2.00.

2.4 Clock Control

The host can use the bus clock signal to SanDisk SD-ROM Cards to decrease power
consumption or to control data flow on the bus. See Section 4.4 of the SDA Physical Layer
Specification, Version 2.00.

2.5 Sleep Mode

SanDisk SD Cards implement a feature to automatically enter and exit from sleep mode. Upon
completion of an operation, cards enter sleep mode to conserve power if no additional
commands are received in less than 5 milliseconds (ms). The host does not have to take any
action for this to occur; however, in order to achieve the lowest sleep current, the host should
also shut down its clock to the card. In most systems, cards are in sleep mode except when
accessed by the host, thus conserving power.

When the host is ready to access a card in sleep mode, any command issued to the card will
cause it to exit sleep mode and respond.

2.6 Hot Insertion

SanDisk SD-ROM Cards support hot insertion into a powered host device through SD
connectors that have power pins that make contact before the signal pins. This approach is
similar to that used in PCMCIA and MMCA devices to allow for hot insertion. For more
information, refer to Section 6.1 and Section 6.2 of the SDA Physical Layer Specification,
Version 2.00.

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