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M28W640ECT Datasheet(PDF) 39 Page - STMicroelectronics |
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M28W640ECT Datasheet(HTML) 39 Page - STMicroelectronics |
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39 / 55 page  39/55 M28W640ECT, M28W640ECB 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 (RCFI) is issued the device enters CFI Query mode and the data structure is read from the memory. Tables 26, 27, 28, 29, 30 and 31 show the addresses used to re- trieve the data. The CFI data structure also contains a security area where a 64 bit unique security number is writ- ten (see Table 31, 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 26. Query Structure Overview Note: Query data are always presented on the lowest order data outputs. Table 27. CFI Query Identification String Note: Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’. Offset Sub-section Name Description 00h Reserved Reserved for algorithm-specific information 10h CFI Query Identification String Command set ID and algorithm data offset 1Bh System Interface Information Device timing & voltage information 27h Device Geometry Definition Flash device layout P Primary Algorithm-specific Extended Query table Additional information specific to the Primary Algorithm (optional) A Alternate Algorithm-specific Extended Query table Additional information specific to the Alternate Algorithm (optional) Offset Data Description Value 00h 0020h Manufacturer Code ST 01h 8848h 8849h Device Code Top Bottom 02h-0Fh reserved Reserved 10h 0051h "Q" 11h 0052h Query Unique ASCII String "QRY" "R" 12h 0059h "Y" 13h 0003h Primary Algorithm Command Set and Control Interface ID code 16 bit ID code defining a specific algorithm Intel compatible 14h 0000h 15h 0035h Address for Primary Algorithm extended Query table (see Table 29) P = 35h 16h 0000h 17h 0000h Alternate Vendor Command Set and Control Interface ID Code second vendor - specified algorithm supported (0000h means none exists) NA 18h 0000h 19h 0000h Address for Alternate Algorithm extended Query table (0000h means none exists) NA 1Ah 0000h |
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