Revision 1.1
PRELIMINARY
Chapter 1 – Introduction
SanDisk iNAND Product Manual
Figure 1-3
Data Transfer Formats
Single Block Mode
Misalignment Error
Memory
Sectors
Memory
Sectors
Memory
Sectors
Memory
Sectors
Memory
Sectors
Memory
Sectors
Memory
Sectors
Start Address
(Read)
Start Address
(Write)
Start Address
(Read/Write)
Multiple Block Mode
Memory
Sectors
Memory
Sectors
Memory
Sectors
Memory
Sectors
Write
Start Address
Stop
Start
Memory
Sectors
Memory
Sectors
Read
Stop
Memory
Sectors
Table 1-1
Mode
Single Block
Mode Definitions
Description
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.
Multiple Block
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.
1.11
SPI Mode
The SPI Mode is a secondary communication protocol for iNAND devices. This mode is a
subset of the SD Protocol, designed to communicate with an SPI channel, commonly found
in Motorola and other vendors’ microcontrollers. Table 1-1 contains names and
descriptions of SPI Mode functions. More information about SPI Mode can be found in
Section 7
or the SDA
Physical Layer Specification, Version 2.00.
© 2007 SanDisk Corporation
1-5
02/09/07
SANKEN [ SANKEN ELECTRIC ]
