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M29DW641F Datasheet(PDF) 66 Page - Numonyx B.V |
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M29DW641F Datasheet(HTML) 66 Page - Numonyx B.V |
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66 / 80 page  Common Flash Interface (CFI) M29DW641F 66/80 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 Read CFI Query command is issued the addressed bank enters Read CFI Query mode and Read Operations in the same bank (A21-A19) output the CFI data. Table 29, Table 30, Table 31, Table 32, Table 33 and Table 34 show the addresses (A0-A10) used to retrieve the data. The CFI data structure also contains a security area where a 64 bit unique security number is written (see Table 34: 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. 1. Query data are always presented on the lowest order data outputs. 1. Query data are always presented on the lowest order data outputs (DQ7-DQ0) only. DQ8-DQ15 are ‘0’. Table 29. Query structure overview Address Sub-section name Description 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 40h Primary Algorithm-specific Extended Query table Additional information specific to the Primary Algorithm (optional) 61h Security Code Area 64 bit unique device number Table 30. CFI Query Identification String Address Data Description Value 10h 0051h “Q” 11h 0052h Query Unique ASCII String "QRY" "R" 12h 0059h "Y" 13h 0002h Primary Algorithm Command Set and Control Interface ID code 16 bit ID code defining a specific algorithm AMD Compatible 14h 0000h 15h 0040h Address for Primary Algorithm extended Query table (see Table 33) P = 40h 16h 0000h 17h 0000h Alternate Vendor Command Set and Control Interface ID Code second vendor - specified algorithm supported NA 18h 0000h 19h 0000h Address for Alternate Algorithm extended Query table NA 1Ah 0000h |
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