SDCFAA-008G SanDisk, SDCFAA-008G Datasheet - Page 6

• Manufacturer Part Number: SDCFAA-008G
• Manufacturer: SanDisk
• Type: CompactFlashr

Specifications of SDCFAA-008G

• Density: 8GByte
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Package Type: Not Required
• Mounting: Socket
• Pin Count: 50
• Operating Temperature Classification: Commercial
• Programmable: Yes
• Lead Free Status / Rohs Status: Supplier Unconfirmed

SanDisk CompactFlash Card OEM Product Manual
02/09, Rev. 1.0 ii © 2007 - 2009 SanDisk Corporation. SanDisk Confidential, subject to all applicable non-disclosure agreements.
1.7
1.7.1
1.7.2
1.7.3
1.7.4
Documentation can be ordered from IHS by calling 1-800-854-7179 or accessing their Web site:
http://global.ihs.com.
Functional Description
CompactFlash Memory cards contain a high level, intelligent subsystem as shown in the block
diagram, Figure 1-1. This intelligent (microprocessor) subsystem provides many capabilities not
found in other types of memory cards. These capabilities include the following:
Technology Independence
The 512-byte sector size of the CompactFlash Memory Card is the same as that in an IDE
magnetic disk drive. To write or read a sector (or multiple sectors), the host computer software
simply issues a Read or Write command to the card. This command contains the address and the
number of sectors to write/read. The host software then waits for the command to complete.
The host software does not get involved in the details of how the flash memory is erased,
programmed or read. This is extremely important as flash devices are expected to get more and
more complex in the future. Because the CompactFlash Memory Card Series uses an intelligent
on-board controller, the host system software will not require changing as new flash memory
evolves. In other words, systems that support CompactFlash Memory cards now, will be able to
access future SanDisk cards built with new flash technology without having to update or change
host software.
Defect and Error Management
CompactFlash Memory cards contain a sophisticated defect and error management system. This
system is analogous to the systems found in magnetic disk drives and in many cases offers
enhancements. If necessary, the cards will rewrite data from a defective sector to a good sector.
This is completely transparent to the host and does not consume any user data space.
The CompactFlash Memory Card soft error rate specification is much better than the magnetic
disk drive specification. In the extremely rare case a read error does occur, CompactFlash
Memory cards have innovative algorithms to recover the data by using hardware on-the-fly Error
Detection Code/Error Correction Code (EDC/ECC), based on a BCH algorithm.
These defect and error management systems, coupled with the solid state construction, give
SanDisk CompactFlash cards unparalleled reliability
Wear Leveling
Wear Leveling is an intrinsic part of the erase pooling functionality of SanDisk CompactFlash
using NAND memory. The CF WEAR LEVEL command is supported as a NOP operation to
maintain backward compatibility with existing software utilities. Advanced features of dynamic
and static wear-leveling, and automatic block management are used to ensure high data
reliability and maximize flash life expectancy.
Using Erase Sector and Write Commands
SanDisk CompactFlash Memory cards support the CF ERASE SECTOR and WRITE
WITHOUT ERASE commands. In some applications, write operations may be faster if the
addresses being written are first erased with the ERASE SECTOR command. WRITE
WITHOUT ERASE behaves as a normal write command and no performance gain results from
its use.
• Standard ATA register and command set (same as found on most magnetic disk
• Host independence from details of erasing and programming flash memory.
• Sophisticated system for managing defects (analogous to systems found in magnetic
• Sophisticated system for error recovery including a powerful error correction code
• Power management for low power operation.
• Implementation of dynamic and static wear-leveling to extend card’s life.
drives).
disk drives).
(ECC).
6
Introduction