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M58CR064C Datasheet(PDF) 54 Page - STMicroelectronics |
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M58CR064C Datasheet(HTML) 54 Page - STMicroelectronics |
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54 / 70 page  M58CR064C, M58CR064D, M58CR064P, M58CR064Q 54/70 APPENDIX B. COMMON FLASH INTERFACE 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 Read CFI Query Command is issued the device enters CFI Query mode and the data structure is read from the memory. Tables 30, 31, 32, 33, 34 and 35 show the addresses used to re- trieve the data. The Query data is always present- ed on the lowest order data outputs (DQ0-DQ7), the other outputs (DQ8-DQ15) are set to 0. The CFI data structure also contains a security area where a 64 bit unique security number is writ- ten (see Figure 5, Security Block and Protection Register Memory Map). This area can be access- ed only in Read mode by the final user. It is impos- sible to change the security number after it has been written by ST. Issue a Read Array command to return to Read mode. Table 30. Query Structure Overview Note: The Flash memory display the CFI data structure when CFI Query command is issued. In this table are listed the main sub-sections detailed in Tables 31, 32, 33, 34 and 35. Query data is always presented on the lowest order data outputs. Table 31. CFI Query Identification String 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) 80h Security Code Area Lock Protection Register Unique device Number and User Programmable OTP Offset Sub-section Name Description Value 00h 0020h Manufacturer Code ST 01h 88CAh 88CBh 8801h 8802h Device Code (M58CR064C/D/P/Q) Top Bottom 02h reserved Reserved 03h reserved Reserved 04h-0Fh reserved Reserved 10h 0051h Query Unique ASCII String "QRY" "Q" 11h 0052h "R" 12h 0059h "Y" 13h 0003h Primary Algorithm Command Set and Control Interface ID code 16 bit ID code defining a specific algorithm 14h 0000h 15h offset = P = 0039h Address for Primary Algorithm extended Query table (see Table 33) p = 39h 16h 0000h 17h 0000h Alternate Vendor Command Set and Control Interface ID Code second vendor - specified algorithm supported NA 18h 0000h 19h value = A = 0000h Address for Alternate Algorithm extended Query table NA 1Ah 0000h |
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