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X76F041H-3 Datasheet(PDF) 8 Page - Xicor Inc. |
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X76F041H-3 Datasheet(HTML) 8 Page - Xicor Inc. |
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8 / 21 page  X76F041 8 ACK Polling Once a stop condition is issued to indicate the end of the host’s write sequence, the X76F041 initiates the internal nonvolatile write cycle. In order to take advantage of the typical 5ms write cycle, ACK polling can be initiated immediately. This involves issuing the Start condition fol- lowed by the new command code of eight bits (1st byte of the protocol). If the X76F041 is still busy with the nonvol- atile 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. Refer to the following flow: ACK Polling Sequence 7002 ILL F12A WRITE SEQUENCE COMPLETED ENTER ACK POLLING ISSUE A START ISSUE NEW COMMAND CODE (1ST BYTE) ACK RETURNED PROCEED NO ACK (SDA HIGH) YES (SDA LOW) After a password sequence, there is always a nonvolatile write cycle. In order to continue the transaction, the X76F041 requires the master to perform an ACK polling with the specific code of C0h. As with regular acknowl- edge polling the user can either time out for 10ms, and then issue the ACK polling once, or continuously loop as described in the flow. As with regular acknowledge polling, if the user chooses to loop, then as long as the nonvolatile write cycle is active, a no ACK will be issued in response to each poll- ing cycle. If the password that was inserted was correct, then an “ACK” will be returned once the nonvolatile write cycle is over, in response to the ACK polling cycle immediately following it. If the password that was inserted was incorrect, then a “no ACK” will be returned even if the nonvolatile write cycle is over. Therefore, the user cannot be certain that the password is incorrect until the 10ms write cycle time has elapsed. Figure 7. Acknowledge Polling SCL SDA 8th clk. of 8th pwd. byte ‘ACK’ clk 8th clk ACK clk 8th bit ‘ACK’ ACK or no ACK START condition 7002 ILL F11 |
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