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S75PL127JBF Datasheet(PDF) 46 Page - SPANSION |
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S75PL127JBF Datasheet(HTML) 46 Page - SPANSION |
46 / 183 page August 12, 2004 S29PL127J_064J_032J_MCP_00_A3 S29PL127J/S29PL064J/S29PL032J for MCP 47 Prel imin ary Chip Erase Command Sequence Chip erase is a six bus cycle operation. The chip erase command sequence is ini- tiated by writing two unlock cycles, followed by a set-up command. Two additional unlock write cycles are then followed by the chip erase command, which in turn invokes the Embedded Erase algorithm. The device does not require the system to preprogram prior to erase. The Embedded Erase algorithm auto- matically preprograms and verifies the entire memory for an all zero data pattern prior to electrical erase. The system is not required to provide any controls or tim- ings during these operations. Table 13 shows the address and data requirements for the chip erase command sequence. When the Embedded Erase algorithm is complete, that bank returns to the read mode and addresses are no longer latched. The system can determine the status of the erase operation by using DQ7, DQ6, DQ2, or RY/BY#. Refer to the Write Operation Status section for information on these status bits. Any commands written during the chip erase operation are ignored. Note that SecSi Sector, autoselect, and CFI functions are unavailable when a [program/ erase] operation is in progress. However, note that a hardware reset immedi- ately terminates the erase operation. If that occurs, the chip erase command sequence should be reinitiated once that bank has returned to reading array data, to ensure data integrity. Note: See Table 13 for program command sequence. Figure 4. Program Operation START Write Program Command Sequence Data Poll from System Verify Data? No Yes Last Address? No Yes Programming Completed Increment Address Embedded Program algorithm in progress |
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