SDSDJ-512 SanDisk, SDSDJ-512 Datasheet - Page 12

• Manufacturer Part Number: SDSDJ-512
• Description: MEMORY CARD SD 512MB
• Manufacturer: SanDisk

Specifications of SDSDJ-512

• Memory Size: 512MB
• Memory Type: Memory Card - Standard SD™
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

06/07, Rev. 2.2
Introduction
Table 1-1 contains descriptions for each mode.
Table 1-1
SPI Mode
The SPI Mode is a secondary communication protocol for cards in the SanDisk SD Card
Product Family. This mode is a subset of the SD Protocol, designed to communicate with an
SPI channel, commonly found in Motorola and other vendors' microcontrollers. Detailed
information about SPI Mode can be found in Section 7 or the SDA Physical Layer
Specification, Version 2.00.
Single Block
Multiple Block
Mode
Mode Definitions
In this mode the host reads or writes one data block in a pre-specified length.
The data block transmission is protected with 16-bit CRC that is generated by
the sending unit and checked by the receiving unit.
The block length for read operations is limited by the device sector size (512
bytes) but can be as small as a single byte. Misalignment is not allowed. Every
data block must be contained in a single physical sector.
The block length for write operations must be identical to the sector size and
the start address aligned to a sector boundary.
This mode is similar to the single block mode, except for the host can read/
write multiple data blocks (all have the same length) that are stored or
retrieved from contiguous memory addresses starting at the address specified
in the command. The operation is terminated with a stop transmission
command.
Misalignment and block length restrictions apply to multiple blocks and are
identical to the single block read/write operations.
1-6
SanDisk SD Card Product Family Product Manual
Description
© 2007 SanDisk Corporation