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X24165SM Datasheet(PDF) 7 Page - Xicor Inc. |
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X24165SM Datasheet(HTML) 7 Page - Xicor Inc. |
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7 / 17 page  X24165 7 Figure 7. Current Address Read Figure 8. Random Read READ OPERATIONS Read operations are initiated in the same manner as write operations with the exception that the R/W bit of the slave address is set HIGH. There are three basic read operations: current address read, random read and sequential read. It should be noted that the ninth clock cycle of the read operation is not a “don’t care.” To terminate a read op- eration, the master must either issue a stop condition during the ninth cycle or hold SDA HIGH during the ninth clock cycle and then issue a stop condition. Current Address Read Internally the X24165 contains an address counter that maintains the address of the last word read, increment- ed by one or the exact address of the last word written. Therefore, if the last access read was to address n, the next read operation would access data from address n + 1. Upon receipt of the slave address with the R/W set HIGH, the X24165 issues an acknowledge and transmits the eight-bit word. The read operation is ter- minated by the master; by not responding with an ac- knowledge and by issuing a stop condition. Refer to Figure 7 for the sequence of address, acknowledge and data transfer. Random Read Random read operations allow the master to access any memory location in a random manner. Prior to issu- ing the slave address with the R/W bit set HIGH, the master must first perform a “dummy” write operation. The master issues the start condition, and the slave ad- dress with the R/W bit set LOW, followed by the word address it is to read. After the word address acknowl- edge, the master immediately reissues the start condi- tion and the slave address with the R/W bit set HIGH. This will be followed by an acknowledge from the X24165 and then by the eight-bit word. The read oper- ation is terminated by the master; by not responding with an acknowledge and by issuing a stop condition. Refer to Figure 8 for the address, acknowledge and data transfer sequence. BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24165 S T A R T SLAVE ADDRESS S S T O P P A C K DATA 6551 ILL F11 BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24165 S T A R T SLAVE ADDRESS S A C K 6551 ILL F12.1 S T A R T S WORD ADDRESS n A C K SLAVE ADDRESS DATA n A C K S T O P P |
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