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X76F200V8 Datasheet(PDF) 5 Page - Xicor Inc. |
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X76F200V8 Datasheet(HTML) 5 Page - Xicor Inc. |
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5 / 16 page  X76F200 5 followed by the new command code of 8 bits (1st byte of the protocol.) If the X76F200 is still busy with the nonvolatile write operation, it will issue a “no-ACK” in response. If the nonvolatile write operation has completed, an “ACK” will be returned and the host can then proceed with the rest of the protocol. After the password sequence, there is always a nonvolatile write cycle. This is done to discourage random guesses of the password if the device is being tampered with. In order to continue the transaction, the X76F200 requires the master to perform a password ACK polling sequence with the specific command code of 55h. As with regular Acknowledge polling the user can either time out for 10ms, and then issue the ACK polling once, or continuously loop as described in the flow. If the password that was inserted was correct, then an “ACK” will be returned once the nonvolatile cycle in response to the passwrod ACK polling sequence is over. If the password that was inserted was incorrect, then a “no ACK” will be returned even if the nonvolatile cycle is over. Therefore, the user cannot be certain that the pass- word is incorrect until the 10ms write cycle time has elapsed. READ OPERATIONS Read operations are initiated in the same manner as write operations but with a different command code. Sector Read With sector read, a sector address is supplied with the read command. Once the password has been acknowledged data may be read from the sector. An acknowledge must follow each 8-bit data transfer. A read operation always begins at the first byte in the sector, but may stop at any time. Random accesses to the array are not possible. Continuous reading from the array will return data from successive sectors. After reading the last sector in the array, the address is automatically set to the first sector in the array and data can continue to be read out. After the last bit has been read, a stop condition is generated without sending a preceding acknowledge. Data ACK Polling Sequence ACK RETURNED ? ISSUE NEW COMMAND CODE WRITE SEQUENCE COMPLETED ENTER ACK POLLING ISSUE START NO YES PROCEED Password ACK Polling Sequence ACK RETURNED ? ISSUE PASSWORD ACK COMMAND PASSWORD LOAD COMPLETED ENTER ACK POLLING ISSUE START NO YES PROCEED |
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