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S70GL02GP10FAIV20 Datasheet(PDF) 11 Page - SPANSION |
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S70GL02GP10FAIV20 Datasheet(HTML) 11 Page - SPANSION |
11 / 14 page December 4, 2006 S70GL-P_00_01 S70GL-P MirrorBit TM Flash Family 9 Da ta Sh e e t (Adv a n ce In f o r m ation) 7. Common Flash Memory Interface The Common Flash Interface (CFI) specification outlines device and host system software interrogation handshake, which allows specific vendor-specified software algorithms to be used for entire families of devices. Software support can then be device-independent, JEDEC ID-independent, and forward- and back- ward-compatible for the specified flash device families. Flash vendors can standardize their existing interfaces for long-term compatibility. This device enters the CFI Query mode when the system writes the CFI Query command, 98h, to address 55h any time the device is ready to read array data. The system can read CFI infomation at the addresses given in Tables 7.2–7.4). All reads outside of the CFI address range, returns non-valid data. Reads from other sectors are allowed, writes are not. To terminate reading CFI data, the system must write the reset command. The system can also write the CFI query command when the device is in the autoselect mode. The device enters the CFI query mode, and the system can read CFI data at the addresses given in Tables 7.2–7.4. The system must write the reset command to return the device to reading array data. The following is a C source code example of using the CFI Entry and Exit functions. Refer to the Spansion Low Level Driver User’s Guide (available on www.spansion.com) for general information on Spansion Flash memory software development guidelines. /* Example: CFI Entry command */ *( (UINT16 *)base_addr + 0x55 ) = 0x0098; /* write CFI entry command */ /* Example: CFI Exit command */ *( (UINT16 *)base_addr + 0x000 ) = 0x00F0; /* write cfi exit command */ For further information, please refer to the CFI Specification (see JEDEC publications JEP137-A and JESD68.01and CFI Publication 100). Please contact your sales office for copies of these documents. Table 7.1 CFI Query Identification String Addresses (x16) Addresses (x8) Data Description 10h 11h 12h 20h 22h 24h 0051h 0052h 0059h Query Unique ASCII string “QRY” 13h 14h 26h 28h 0002h 0000h Primary OEM Command Set 15h 16h 2Ah 2Ch 0040h 0000h Address for Primary Extended Table 17h 18h 2Eh 30h 0000h 0000h Alternate OEM Command Set (00h = none exists) 19h 1Ah 32h 34h 0000h 0000h Address for Alternate OEM Extended Table (00h = none exists) |
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