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800FB Datasheet(PDF) 56 Page - Numonyx B.V |
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800FB Datasheet(HTML) 56 Page - Numonyx B.V |
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56 / 67 page  Common Flash Interface (CFI) M29FxxxFT, M29FxxxFB 56/67 Appendix B Common Flash Interface (CFI) The Common Flash Interface is a JEDEC approved, standardized data structure that can be read from the Flash memory device. It allows a system software to query the device to determine various electrical and timing parameters, density information and functions supported by the memory. The system can interface easily with the device, enabling the software to upgrade itself when necessary. When the CFI Query Command is issued the device enters CFI Query mode and the data structure is read from the memory. Addresses used to retrieve the data are shown in the following tables: Table 31.: Query Structure Overview, Table 32.: CFI Query Identification String, Table 33.: CFI Query System Interface Information, Table 34.: Device Geometry Definition, Table 35.: Primary Algorithm-Specific Extended Query Table Table 36.: Security Code Area The CFI data structure also contains a security area where a 64-bit unique security number is written (see Table 36.: Security Code Area). This area can be accessed only in Read mode by the final user. It is impossible to change the security number after it has been written by Numonyx. Issue a Read command to return to Read mode. Table 31. Query Structure Overview Query data are always presented on the lowest order data outputs. Table 32. CFI Query Identification String Address Sub-section Name Description x16 x8 10h 20h CFI Query Identification String Command set ID and algorithm data offset 1Bh 36h System Interface Information Device timing & voltage information 27h 4Eh Device Geometry Definition Flash device layout 40h 80h Primary Algorithm-specific Extended Query table Additional information specific to the Primary Algorithm (optional) 61h C2h Security Code Area 64 bit unique device number Address Data Description Value x16 x8 10h 20h 0051h "Q" 11h 22h 0052h Query Unique ASCII String "QRY" "R" 12h 24h 0059h "Y" 13h 26h 0002h Primary Algorithm Command Set and Control Interface ID code 16 bit ID code defining a specific algorithm AMD Compatible 14h 28h 0000h 15h 2Ah 0040h Address for Primary Algorithm extended Query table (see Table 34.) P = 40h 16h 2Ch 0000h |
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