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X24022P Datasheet(PDF) 5 Page - Xicor Inc. |
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X24022P Datasheet(HTML) 5 Page - Xicor Inc. |
5 / 14 page X24022 5 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 WORD ADDRESS DATA Figure 4. Slave Address DEVICE ADDRESSING Following a start condition the master must output the address of the slave it is accessing. The most significant four bits of the slave address are the device type identifier (see Figure 4). For the X24022 this is fixed as 1010[B]. The next three significant bits address a particular device. A system could have up to eight X24022 devices on the bus (see Figure 10). The eight addresses are defined by the state of the A0, A1 and A2 inputs. The last bit of the slave address defines the operation to be performed. When set to one a read operation is selected, when set to zero a write operation is selected. Following the start condition, the X24022 monitors the SDA bus comparing the slave address being transmit- ted with its slave address (device type and state of A0, A1 and A2 inputs). Upon a correct compare the X24022 outputs an acknowledge on the SDA line. Depending on the state of the R/ W bit, the X24022 will execute a read or write operation. WRITE OPERATIONS Byte Write For a write operation, the X24022 requires a second address field. This address field is the word address, comprised of eight bits, providing access to any one of the 256 words of memory. Upon receipt of the word address the X24022 responds with an acknowledge, and awaits the next eight bits of data, again responding with an acknowledge. The master then terminates the transfer by generating a stop condition, at which time the X24022 begins the internal write cycle to the nonvolatile memory. While the internal write cycle is in progress the X24022 inputs are disabled, and the device will not respond to any requests from the master. Refer to Figure 5 for the address, acknowledge and data transfer sequence. 3848 FHD F09 Figure 5. Byte Write 3848 FHD F10 1 0 1 0 A2 A1 A0 R/W DEVICE TYPE IDENTIFIER DEVICE ADDRESS |
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