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MB89R118C2-DI15 Datasheet(PDF) 3 Page - Fujitsu Component Limited. |
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MB89R118C2-DI15 Datasheet(HTML) 3 Page - Fujitsu Component Limited. |
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3 / 48 page  MB89R118C DS411-00001-1v0-E 3 ■ MEMORY MAP This section describes the FRAM memory, which is the internal memory of the MB89R118C. • FRAM Configuration The FRAM has 2000 bytes for use as user area and 48 bytes for use as system area. The FRAM memory areas consist of a total of 256 blocks (250 blocks of user area and 6 blocks of system area). Each block can store 64 bits (8 bytes) of data. The block is the unit used for the writing and reading of FRAM data. The memory configuration of FRAM is shown below. • FRAM memory configuration Blocks “00H” to “F9H” are user area. The user area is defined as an area that can be accessed when the corresponding block address is specified. On the other hand, Blocks “FAH” to “FFH” are system area. The system area is defined as an area that can be accessed only with a specific command. The system area consists of 6 blocks and contains UID, AFI, DSFID, EAS bits, and security status (can write or cannot write) data for individual block. UID is fixed and cannot be updated. AFI, DSFID, and EAS bits are written at the factory, and can be updated and locked (disable to write) with commands (Only EAS bit cannot be locked) . As shown in above, “FAH” holds the UID, and “FCH” to “FFH” hold the security status information on individual user areas. The configuration of “FBH” to “FFH” blocks is shown below. “FBH” block is used for EAS status, AFI and DSFID data, the security status data of AFI and DSFID. “FCH” to “FFH” blocks contain block security status data. * : Reserved for future use Area Block No. Details Data read Data write User area (2000 bytes) 00H to F9H User area Yes Yes System area (48 bytes) FAH UID (64 bits) Yes No FBH AFI, DSFID, EAS, security status Yes Limited FCH to FFH Block security status Yes No MSB RFU* DSFID 56 33 32 25 LSB AFI 81 AFI Lock 16 9 DSFID Lock 64 57 EAS Status 24 17 Status Status • Structure of “FBH” |
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