SanDisk SD064 manual SanDisk SD-ROM Card Specifications, Operating Specifications, Memory Capacity

Page 6

3 SanDisk SD-ROM Card Specifications

3.1 Operating Specifications

The table below summarizes the SD-ROM operating specifications.

	Parameter		Value		Notes
	Supply Voltage		2.0 – 3.6v		during card identification for version 1.1 cards
			2.7 – 3.6v		all supported commands
	Operating Temperature		-25 – 85 °C
	Storage Temperature		-40 – 85 °C
	Data Retention		100 years minimum
	Data Endurance	1x109 read cycles
	Interface speed		0 – 25MHz		variable clock rate
	Read Bandwidth	1.8MB/s minimum		sequential read, 25MHz interface speed
	Read Current		50mA typical
	Read Current		75mA maximum		maximum at 3.6v, 85 °C
			75mA maximum		maximum at 3.6v, 85 °C
	Sleep Current	250uA maximum
	Reset to Read Latency		300ms
	Read Command Response		100ms

3.2 Memory Capacity

SanDisk SD-ROM Cards are sold preloaded with an OEM-specified image which may or may not have a file system. In general, a file system provides structure for data; the SD Card File System Specification, published by the SDA, describes the file format system that is typically implemented on SD cards.

SanDisk SD-ROM cards do not support the SD security features (CPRM), and are therefore organized as a single non-secure partition. The content data can be accessed by the host system using standard read commands.

The following table lists the available user space for 32, 64, and 128MB cards. Note that some hosts cannot handle non-standard image sizes, so the allowable space for a particular application may be less than shown in the table.

Capacity	Maximum User LBA	Maximum User Data Image Size
32 MB	63,488	31.0MB	(32505856 bytes)
64 MB	129,024	63.0MB	(66060288 bytes)
128 MB	260,096	127.0MB	(133169152 bytes)

3.3 Register Values

The SD specifications define a set of eight registers within the card interface. However, the DSR Register is optional and is not used in the SanDisk SD Card Product Family. For specific information about all registers, refer to Section 5 of the SDA Physical Layer Specification, Version 2.00.

SanDisk Confidential

Image 6

Contents SanDisk SD-ROM Product Manual SanDisk Confidential Introduction Feature SummarySD-ROM Card Overview SD Card StandardSanDisk SD-ROM Card Functional Description Supported Commands Card State TransitionsSD-ROM Card Functional Behavior Memory Capacity SanDisk SD-ROM Card SpecificationsOperating Specifications Register ValuesRegister Abbreviation Width in bits Register Name Card Identification RegisterCard Specific Data Register Name Type Size Value CommentsSD Card Configuration Register Field Value CommentsSD Status Register Bus TopologyCard Status Register Relative Card Address RegisterPhysical / Mechanical Power UpElectrical Interface Bus Operating ConditionsSanDisk Confidential