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X76F641X Datasheet(PDF) 8 Page - Xicor Inc. |
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X76F641X Datasheet(HTML) 8 Page - Xicor Inc. |
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8 / 17 page  X76F641 8 Figure 7. Sequential Read Data X S COMMAND Read Password 7 Read Password 0 S SDA Data 0 If ACK, then Wait tWC OR ACK POLLING S ACK Polling Repeated COMMAND Command Password Matches 7025 FM 12 PASSWORDS The sequence in Figure 8 shows how to change (pro- gram) the passwords. The programming of passwords is done twice prior to the nonvolatile write cycle in order to verify that the new password is consistent. After the eight bytes are entered in the second pass, a comparison takes place. A mismatch will cause the part to reset and enter into the standby mode. Data ACK polling can be used to determine if a password has been loaded correctly, however the data ACK com- mand must be issued less than 2ms after the stop bit. After this time, it cannot be determined if the password has been loaded correctly, without trying the new pass- word. To determine if the new password has been loaded correctly the data ACK polling command is issued imme- diately following the stop bit. If it returns an ACK, then the two passes of the new password entry do not match. If it returns a "no ACK" then the passwords match and a high voltage cycle is in progress. The high voltage cycle is complete when a subsequent data ACK command returns an "ACK". There is no way to read any of the passwords. Figure 8. Change Passwords COMMAND Old Password 7 Old Password 0 S SDA New Password 7 Password 0 New Password 7 New Password 0 S If ACK, then Two bytes of “0” Wait tWC OR ACK POLLING S ACK Polling Repeated COMMAND Command Password Matches If immediate ACK, then New Password error Data ACK Polling If immediate NACK, then New Password OK followed by ACK after ~5ms 7025 FM 13 |
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