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X24F064SE Datasheet(PDF) 5 Page - Xicor Inc. |
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X24F064SE Datasheet(HTML) 5 Page - Xicor Inc. |
5 / 18 page X24F064/032/016 5 DEVICE ADDRESSING Following a start condition the master must output the address of the slave it is accessing (see Figure 4). The next two bits are the device select bits. A system could have up to eight X24F032/016’s on the bus or up to four 24F064’s on the bus. The device addresses are defined by the state of the S0, S1, and S2 inputs. Note some of the slave addresses must be the inverse of the corresponding input pin. Figure 4. Slave Address 6686 ILL F07.4 S2 A9 A8 R/W DEVICE SELECT S1 A12 HIGH ORDER SECTOR ADDRESS A11 A10 X24F064 S2 A9 A8 R/W DEVICE SELECT S1 S0 HIGH ORDER SECTOR ADDRESS A11 A10 X24F032 1 A9 A8 R/W DEVICE TYPE IDENTIFIER S2 S1 HIGH ORDER SECTOR ADDRESS S0 A10 X24F016 DEVICE SELECT Also included in the slave address is an extension of the array’s address which is concatenated with the eight bits of address in the sector address field, providing direct access to the entire SerialFlash Memory array. The last bit of the slave address defines the operation to be performed. When set HIGH a read operation is selected, when set LOW a program operation is selected. Following the start condition, the X24F064/032/016 monitors the SDA bus comparing the slave address being transmitted with its slave address device type identifier. Upon a correct comparison of the device select inputs, the X24F064/032/016 outputs an acknowledge on the SDA line. Depending on the state of the R/W bit, the X24F064/032/016 will execute a read or program operation. PROGRAMMING OPERATIONS The X24F064/032/016 offers a 32-byte sector pro- gramming operation. For a program operation, the X24F064/032/016 requires a second address field. This field contains the address of the first byte in the sector. Upon receipt of the address, comprised of eight bits, the X24F064/032/016 responds with an ac- knowledge and awaits the next eight bits of data, again responding with an acknowledge. The master then transmits 31 more bytes. After the receipt of each byte, the X24F064/032/016 will respond with an acknowledge. Figure 5. Sector Programming BUS ACTIVITY: MASTER SDA LINE BUS ACTIVITY: X24F016/032/064 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 SECTOR ADDRESS DATA n DATA n+1 DATA n+31 6686 ILL F10.3 |
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