SDSDH-2048-J SanDisk, SDSDH-2048-J Datasheet - Page 10

• Manufacturer Part Number: SDSDH-2048-J
• Description: MEMORY CARD SD 2GB ULTRA II
• Manufacturer: SanDisk

Specifications of SDSDH-2048-J

• Memory Size: 2GB
• Memory Type: Memory Card - Ultra II SD™
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 585-1230; SDSDH-2048-J

Introduction
SanDisk SD Card Product Family Product Manual
Wear Leveling
Wear leveling is an intrinsic part of the erase pooling functionality of cards in the SanDisk SD
Card Product Family using NAND memory.
Automatic Sleep Mode
A unique feature of cards in the SanDisk SD Card Product Family is automatic entrance and
exit from sleep mode. Upon completion of an operation, cards enter sleep mode to conserve
power if no further 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 needs to 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 it will cause it
to exit sleep, and respond.
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. This approach is similar to that used
in PCMCIA and MMCA devices to allow for hot insertion.
SD Card Products in SD Bus Mode
The following sections provide valuable information on cards in the SanDisk SD Card Product
Family in SD Bus mode.
Cards in the SanDisk SD Card Product Family are fully compliant with the SDA Physical
Layer Specification, Version 2.00. Card Specific Data (CSD) Register structures are compliant
with CSD Structure 1.0 and 2.0.
This section covers Negotiating Operating Conditions, Card Acquisition and Identification,
Card Status, Memory Array Partitioning, Read/Write Operations, Data Transfer Rate, Data
Protection in Flash Cards, Write Protection, Copy Bit, and CSD Register.
Additional practical card detection methods can be found in application notes pertaining to the
SDA Physical Layer Specification, Version 2.00.
06/07, Rev. 2.2
1-4
© 2007 SanDisk Corporation