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ATA555814-DDB Datasheet(PDF) 7 Page - ATMEL Corporation |
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ATA555814-DDB Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 52 page  7 4681E–RFID–11/09 ATA5558 To access a protected memory block, a Login command with the corresponding read or write password had to be executed once per session. During the login procedure the 32-bit password field of the login command is compared with the contents of the corresponding password in the system memory. If the passwords match, the ATA5558 tag will return an SOF pattern as an acknowledge signal. If they do not match, the tag will respond with an SOF followed by the appropriate error code. Writing to a protected memory address which has not been enabled with the correct LoginWrite password, will result in an error code on completion of the interrogator command. Reading a password protected memory address which has not been enabled with the correct LoginRead password, returns a block of all 0 data and no error code. Figure 2-5. System Memory Access Figure 2-6. Page Security Register 2.7.2 Lock Bit Each memory block, consists of 32 data bits and an associated lock bit (see Figure 2-3 on page 4). Once a block is locked (lock bit = 1), the entire block including the lock bit itself can no longer be reprogrammed Configuration Page Security Traceability 3 Traceability 2 Traceability 1 Tag ID 3 Tag ID 2 Tag ID 1 Password - Write Password - Read 62 63 61 60 59 58 57 56 55 54 Configuration Page Security Traceability 3 Traceability 2 Traceability 1 Tag ID 3 Tag ID 2 Tag ID 1 Password - Write Password - Read Block Name Block Name Block Name Unlimited Access Password Access No Access Read Access Write Access L 32 10 76 54 15 14 13 12 19 18 17 16 23 22 21 20 11 10 9 8 27 26 25 24 31 30 29 28 P4a P3a P4b P0b P2b P2a P3b P7a P7b P6a P6b P5a P5b P1a P1b P0a reserved Page 7 Page 6 Page 5 Page 4 Page 0 Page 1 Page 2 Page 3 Page Security Data Password required for write read P xa P xb 00 10 01 1 1 reserved reserved no yes yes no no yes Code MSB............. ...........LSB |
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