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FM24C64B-G Arkusz danych(PDF) 7 Page - Ramtron International Corporation |
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FM24C64B-G Arkusz danych(HTML) 7 Page - Ramtron International Corporation |
7 / 12 page FM24C64B Rev. 1.3 Feb. 2011 7 of 12 master issues a start condition. This simultaneously aborts the write operation and allows the read command to be issued with the device address LSB set to a 1. The operation is now a current address read. S A Slave Address 1 Data Byte 1 P By Master By FM24C64B Start Address Stop Acknowledge No Acknowledge Data Figure 7. Current Address Read S A Slave Address 1 Data Byte 1 P By Master By FM24C64B Start Address Stop Acknowledge No Acknowledge Data Data Byte A Acknowledge Figure 8. Sequential Read S A Slave Address 1 Data Byte 1 P By Master By FM24C64B Start Address Stop No Acknowledge Data S A Slave Address 0 Address MSB A Start Address Acknowledge Address LSB A X Figure 9. Selective (Random) Read Endurance The FM24C64B internally operates with a read and restore mechanism. Therefore, endurance cycles are applied for each read or write cycle. The memory architecture is based on an array of rows and columns. Each read or write access causes an endurance cycle for an entire row. In the FM24C64B, a row is 64 bits wide. Every 8-byte boundary marks the beginning of a new row. Endurance can be optimized by ensuring frequently accessed data is located in different rows. Regardless, FRAM read and write endurance is effectively unlimited at the 1MHz two-wire speed. Even at 3000 accesses per second to the same segment, 10 years time will elapse before 1 trillion endurance cycles occur. |
Podobny numer części - FM24C64B-G |
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Podobny opis - FM24C64B-G |
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