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M58WR064HT Datasheet(PDF) 29 Page - Numonyx B.V |
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M58WR064HT Datasheet(HTML) 29 Page - Numonyx B.V |
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29 / 111 page  M58WR064HT, M58WR064HB Command interface - Factory program commands 29/111 6.4 Enhanced Factory Program Command The Enhanced Factory Program command can be used to program large streams of data within any one block. It greatly reduces the total programming time when a large number of Words are written to a block at any one time. Dual operations are not supported during the Enhanced Factory Program operation and the command cannot be suspended. For optimum performance the Enhanced Factory Program commands should be limited to a maximum of 10 program/erase cycles per block. If this limit is exceeded the internal algorithm will continue to work properly but some degradation in performance is possible. Typical Program times are given in Table 16 If the block is protected then the Enhanced Factory Program operation will abort, the data in the block will not be changed and the Status Register will output the error. The Enhanced Factory Program command has four phases: the Setup Phase, the Program Phase to program the data to the memory, the Verify Phase to check that the data has been correctly programmed and reprogram if necessary and the Exit Phase. Refer to Table 7: Factory Program Commands, and Figure 27: Enhanced Factory Program Flowchart. 6.5 Setup Phase The Enhanced Factory Program command requires two Bus Write operations to initiate the command. ● The first bus cycle sets up the Enhanced Factory Program command. ● The second bus cycle confirms the command. The Status Register P/E.C. Bit SR7 should be read to check that the P/E.C. is ready. After the confirm command is issued, read operations output the Status Register data. The read Status Register command must not be issued as it will be interpreted as data to program. If the second bus cycle is not EFP confirm (D0h), Status Register bits SR4 and SR5 are set and the command aborts. VPP value must be in the VPPH range during the confirm command, otherwise SR4 and SR3 are set and command will be aborted. |
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