Embedded File Systems (FAT, Flash, Compact)
FAT Compatible File System
SFATFS SCIOPTA FAT File System
Advanced fully featured FAT12, FAT16 and FAT32 file system for embedded systems with long filenames; caching options, Unicode support, drivers for Compact Flash, MMC, SD cards, HDDs, NAND Flash and Serial Flash.
Features
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FAT12/16/32 |
Long Filenames |
Robust |
Multiple Volumes |
Mix of media types |
Unicode16 support |
Media Error Handling |
Fully PC compatible |
Multiple files open for reading/writing |
Efficient zero-copy read/write |
Caching Options |
CheckDisk Utility |
Hard Disk Drives
Sample Driver and reference designs have been created for interfacing an IDE HDD to a FAT file system. Also provided in the file system are caching options which are essential when using a HDD. The caching mechanisms combined with the efficiency of SFATFS and its mainly zero-copy reads and writes gives the best possible performance when implementing a HDD on an embedded system.
MultiMedia Card and Secure Digital Cards
This is probably the simplest method to add a DOS compatible file media to your embedded device. We provide a range of drivers for interfacing to SD and MMC cards including standard SPI implemented in either hardware or software. We provide hardware design information for implementing this.
Compact Flash Cards
Compact Flash cards require a more complex communication with a PC compatible media but offers performance advantages because of the wider data bus thus generally a higher throughput is achieved and in many cases a reduced CPU load. We also provide hardware design information and CPLD logic where appropriate.
RAM Drive
A RAM drive is provided as standard and is particularly useful in getting a system up and running without any hardware dependencies.
Please ask for other supported devices
Flash File Systems
SFFS SCIOPTA Flash File System
High performance file system designed and tested to handle unexpected resets cleanly. Can be used for driver on all NOR, NAND and serial flash types.
SFFS is a file system targeted at embedded devices which use NOR or NAND type flash devices that require a high degree of reliability. The system is completely protected against unexpected power-failure or reset.
SFFS Tiny Flash File System
SFFS Tiny is a failsafe file system designed for any flash device with small erasable sectors. Ideal for most standard serial flash parts, Flash based Micros with small erasable sectors and RAM drives.
Flash technology is constantly changing and comes in many variants. To get the most from any particular flash arrangement file systems need to be crafted. SFFS Tiny is crafted to work with flash which has small erasable sectors with the specific design goals of being failsafe, having small ROM footprint and minimal RAM footprint - making it possible to use with very small microcontrollers.
Features
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100% Power Fail Safe |
Long Filenames |
Multiple Volumes |
Directory Handling |
Multiple simultaneous files open |
Unicode16 support |
Mix of media types |
Erase Suspend/Resume |
Wear-Leveling (Static and Dynamic) |
ECC algorithms |
Bad Block handling |
Reserved Sectors |
Sample Drivers |
SFFSN Flash File System NAND
SFFSN is designed to support all types of standard NAND flash.
NAND flash is a relatively new flash technology designed to store large amounts of non-volatile data at reduced cost. It is characterized by having storage that can only be written to if previously erased - these blocks erase quicker than on NOR flash but is still quite long. Other features that differentiate it from NOR flash are that it is often shipped with a number of bad-blocks and their reliability is much increased if all single bit errors are detected and fixed.
There are many different NAND flash devices available all with slightly different characteristics while retaining the same base properties. The system supports all known manufacturers devices including: Samsung, Renesas, Toshiba, Micron and ST Micro. Sample drivers are provided for Samsung, ST, and Micron devices.
NOR Flash
SFFS is designed to support all types of standard NOR flash. NOR flash is one of the base building blocks of most embedded systems. It contains non-volatile storage of data and code for systems and is characterized by having storage that can only be written to if previously erased and erasable blocks with relatively long erase times.
Sample Drivers
Provided with the system is a range of sample drivers for various flash devices from different manufacturers. The sample drivers are carefully documented in the developer's guide to allow easy porting to whatever chip/hardware configuration is required.
Devices Supported
There are literally thousands of NOR flash devices available all with slightly different characteristics while retaining the same base properties. The system supports many known manufacturers devices.
Please ask for information about supported devices.
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