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AN3002 Datasheet(PDF) 20 Page - STMicroelectronics |
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AN3002 Datasheet(HTML) 20 Page - STMicroelectronics |
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20 / 22 page  M24LRxx’s conditional memory access AN3002 20/22 Doc ID 15912 Rev 2 Figure 9. M24LRxx RF and I2C access condition mix 1. The lighter the shade the more rights, the darker the shade, the less rights (so that white indicates both read and write access rights whereas black means neither). It is simple to extend the RF capability of existing serial EEPROM memory applications by using the scheme given in Figure 10. Figure 10. Example of an RF capability extension in an application running with an EEPROM 1. The lighter the shade the more rights, the darker the shade, the less rights (so that white indicates both read and write access rights whereas black means neither). In Figure 10, the first part of the memory is limited to I2C access to ensure backward compatibility with the existing I2C serial access. The rest of the memory is shared between I2C and RF, making it possible to transfer data in both a “contact” and a “contactless” way, between the I2C interface application and the RFID reader. Access rights for I2C M24LRxx user memory Access rights for RF Read and Write Sector 0 Status: shared Read and Write Read and Write Sector 1 Status: I2C mastered Read only Read and Write Sector 2 Status: I2C only Not accessible Read only Sector 3 Status: RF mastered Read and Write Read only Sector 4 Status: Read only Read only Read only Sector 5 Status: I2C Read only Not accessible … Read and Write Sector 63 Status: I2C only Not accessible 01010 01010 ai17129 Access rights for I2C M24LRxx user memory Access rights for RF Read and write Memory sector Status: I2C only Not accessible Read and write Memory sector Status: I2C only Not accessible Read and write … Not accessible Read and write Memory sector Status: I2C only Not accessible Read and write Memory sector Status: I2C only Not accessible Read and write Memory sector Status: shared Read and write Read and write Memory sector Status: shared Read and write Read and write … Read and write Read and write Memory sector Status: shared Read and write Read and write Memory sector Status: shared Read and write 01010 01010 ai17130 |
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