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X24164P Datasheet(PDF) 6 Page - Xicor Inc. |
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X24164P Datasheet(HTML) 6 Page - Xicor Inc. |
6 / 14 page X24164 6 WRITE OPERATION COMPLETED ENTER ACK POLLING ISSUE START ISSUE SLAVE ADDRESS AND R/W = 0 ACK RETURNED? NEXT OPERATION A WRITE? ISSUE BYTE ADDRESS PROCEED ISSUE STOP NO YES YES PROCEED ISSUE STOP NO Flow 1. ACK Polling Sequence Page Write The X24164 is capable of a sixteen byte page write operation. It is initiated in the same manner as the byte write operation, but instead of terminating the write cycle after the first data word is transferred, the master can transmit up to fifteen more words. After the receipt of each word, the X24164 will respond with an acknowledge. After the receipt of each word, the four low order address bits are internally incremented by one. The high order seven bits of the word address remain constant. If the master should transmit more than sixteen words prior to generating the stop condition, the address counter will “roll over” and the previously written data will be over- written. As with the byte write operation, all inputs are disabled until completion of the internal write cycle. Refer to Figure 6 for the address, acknowledge and data transfer sequence. Acknowledge Polling The disabling of the inputs can be used to take advan- tage of the typical 5 ms write cycle time. Once the stop condition is issued to indicate the end of the host’s write operation the X24164 initiates the internal write cycle. ACK polling can be initiated immediately. This involves issuing the start condition followed by the slave address for a write operation. If the X24164 is still busy with the write operation no ACK will be returned. If the X24164 has completed the write operation an ACK will be returned and the host can then proceed with the next read or write operation. Refer to Flow 1. 3846 FHD F12 Figure 6. Page Write BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24164 S T A R T SLAVE ADDRESS S S T O P P A C K A C K A C K A C K A C K WORD ADDRESS (n) DATA n DATA n+1 DATA n+15 NOTE: In this example n = xxxx 0000 (B); x = 1 or 0 3846 FHD F13 |
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