SanDisk SD064 - Manual (Page 3)

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 end-
users 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 industry-
standard 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:
+1 (925) 275-6615 Fax: +1 (925) 886-4870 E-mail: [email protected] Web site:
www.sdcard.org
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