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X24042S8-2.7 Datasheet(PDF) 6 Page - Xicor Inc. |
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X24042S8-2.7 Datasheet(HTML) 6 Page - Xicor Inc. |
6 / 15 page X24042 6 Page Write The X24042 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 seven more words. After the receipt of each word, the X24042 will respond with an acknowl- edge. After the receipt of each word, the three low order address bits are internally incremented by one. The high order eight bits of the word address remain constant. The master should not transmit more than eight words prior to generating the stop condition. 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 X24042 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 X24042 is still busy with the write operation no ACK will be returned. If the X24042 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. Flow 1. ACK Polling Sequence 3849 FHD F11 Figure 6. Page Write 3849 FHD F12 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 BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24042 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 000 (B); x = 1 or 0 |
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