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VxWorks

Hardware Considerations Guide, 6.0

Parallel Ports

VxWorks provides simple support of parallel ports. Refer to directory

target/src/drv/parallel for supported devices and capabilities.

8. Flash Devices and Flash File System Support

This section discusses TrueFFS features and functionality. In addition, this section

provides generic information on flash devices and a discussion of TrueFFS usage.

8.1 Flash Devices

There are two types of flash technology—NOR and NAND—that are named after

the types of logic devices that comprise each bit in the flash device. A third type of

flash technology, SSFDC, is a special case of NAND. TrueFFS for VxWorks

supports NOR devices and SSFDC devices. NAND devices that do not comply

with the SSFDC specification are not supported.

NOR Technology

NOR technology offers XIP (execute in place) capabilities and high read

performance. Write and erase performance is very low.

NAND Technology

NAND technology allows very high cell densities and high capacity. Write, read,

and erase performance is very high.

SSFDC Technology

SSFDC (solid state floppy device card) flash is generally known as smart media.

For more information about this type of flash, see the SSFDC forum at:

http://www.ssfdc.or.jp/english

NOTE: In general, Wind River no longer supports NAND technology. Only NAND

flash that is SSFDC compliant is supported.

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RAM 6.0 BUX II Series Guía de usuario Pagina 26