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M29F800DT Datasheet(PDF) 29 Page - STMicroelectronics |
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M29F800DT Datasheet(HTML) 29 Page - STMicroelectronics |
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29 / 39 page  29/39 M29F800DT, M29F800DB APPENDIX B. COMMON FLASH INTERFACE (CFI) The Common Flash Interface is a JEDEC ap- proved, 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 mem- ory. The system can interface easily with the de- vice, enabling the software to upgrade itself when necessary. When the CFI Query Command is issued the de- vice enters CFI Query mode and the data structure is read from the memory. Tables 21, 22, 23, 24, 25 and 25 show the addresses used to retrieve the data. The CFI data structure also contains a security area where a 64 bit unique security number is writ- ten (see Table , Security Code area). This area can be accessed only in Read mode by the final user. It is impossible to change the security num- ber after it has been written by ST. Issue a Read command to return to Read mode. Table 21. Query Structure Overview Note: Query data are always presented on the lowest order data outputs. Table 22. CFI Query Identification String Note: Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’. 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 24) P = 40h 16h 2Ch 0000h 17h 2Eh 0000h Alternate Vendor Command Set and Control Interface ID Code second vendor - specified algorithm supported NA 18h 30h 0000h 19h 32h 0000h Address for Alternate Algorithm extended Query table NA 1Ah 34h 0000h |
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