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X24022 Datasheet(PDF) 6 Page - Xicor Inc. |
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X24022 Datasheet(HTML) 6 Page - Xicor Inc. |
6 / 14 page 6 X24022 Flow 1. ACK Polling Sequence Page Write The X24022 is capable of an four 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 three more words. After the receipt of each word, the X24022 will respond with an acknowledge. After the receipt of each word, the two low order address bits are internally incremented by one. The high order five bits of the address remain constant. If the master should transmit more than four words prior to generating the stop condition, the address counter will “roll over” and the previously written data will be overwritten. 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, during the internal write operation, can be used to take advantage 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 X24022 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 X24022 is still busy with the write operation no ACK will be returned. If the X24022 has completed the write operation an ACK will be returned and the master can then proceed with the next read or write operation (See Flow 1). 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 3848 FHD F11 Figure 6. Page Write 3848 FHD F12 BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24022 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+3 NOTE: In this example n = xxxx 0000(B); x = 1 or 0 |
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