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Mass Data Management for Embedded Systems: Compact Flash

Mass Data Management for Embedded Systems: Compact Flash. Eric Ng, MSME EE281: ESDL December 4, 2002. Presentation Overview. Reasons for using Compact Flash Other Mass Storage Options Step-by-Step Guide to using CF FAT (File Allocation Table) Overview. Reasons for Using Compact Flash.

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Mass Data Management for Embedded Systems: Compact Flash

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  1. Mass Data Management for Embedded Systems: Compact Flash Eric Ng, MSME EE281: ESDL December 4, 2002

  2. Presentation Overview • Reasons for using Compact Flash • Other Mass Storage Options • Step-by-Step Guide to using CF • FAT (File Allocation Table) Overview

  3. Reasons for Using Compact Flash • Portable+Low Power: Data management has become crucial in today’s embedded systems. • Data loggers, MP3 Players, Digital Cameras, PDAs • No Mechanical Parts: withstands higher shock impacts compared to HDDs.~1000Gs vs ~200Gs (Operating Condition) • Relatively Inexpensive: 512MB ~ $120 • Fast: avg seek time: 10ms;10x faster than floppy • Nonvolatile Memory: 10 yr retention

  4. Other Mass Storage Options • Sony Memory Stick • IBM Microdrive • MultiMedia Card (MMC) or Secure Digital Card (SD) • SmartMedia Card (SMC)

  5. Introduction to UsingCompact Flash • Lots of literature, but straight forward. Compact Flash has HDD interface. • PC AT Attachment (ATA) • Its compact nature may be difficult to interface without adapter. • IDE to Compact Flash Adapter Step-by-Step Guide >>

  6. Step 1: IDE to CF Adapter http://www.acscontrol.com $19.99

  7. Step 2: controller Interface • CF has 50 pin outs, but requires only following connections • Data Port (8-bit or 16-bit) • Address Lines (5) • Read/Write Lines (2)

  8. Step 3: Accessing the Registers

  9. Example: Reading Data • Initialization Sequence: • (1) Set Features to Enable 8-bit transfers • (2) Enable Logical Block Addressing (LBA) • Identify sector by writing to LBA registers • Call command: Read Sectors • Retrieve data from Data Register

  10. Summary • Compact Flash is EASY to use! • (1) Get adapter • (2) Interface with u-controller • (3) Learn to use the registers • File Organization in the CF • File Allocation Table (FAT)

  11. Resources • CompactFlash Association • http://www.compactflash.org • Microsoft • File Allocation Table (FAT) White Paper • IDE to CF Adapter • http://www.acscontrol.com

  12. Memory Comparison

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