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AM49LV4608M 데이터시트(PDF) 31 Page - SPANSION |
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31 / 63 page November 5, 2003 Am49LV6408M 29 ADV ANCE I N FO RMAT I O N Figure 4. Write Buffer Programming Operation Write “Write to Buffer” command and Sector Address Write number of addresses to program minus 1(WC) and Sector Address Write program buffer to flash sector address Write first address/data Write to a different sector address FAIL or ABORT PASS Read DQ7 - DQ0 at Last Loaded Address Read DQ7 - DQ0 with address = Last Loaded Address Write next address/data pair WC = WC - 1 WC = 0 ? Part of “Write to Buffer” Command Sequence Yes Yes Yes Yes Yes Yes No No No No No No Abort Write to Buffer Operation? DQ7 = Data? DQ7 = Data? DQ5 = 1? DQ1 = 1? Write to buffer ABORTED. Must write “Write-to-buffer Abort Reset” command sequence to return to read mode. Notes: 1. When Sector Address is specified, any address in the selected sector is acceptable. However, when loading Write-Buffer address locations with data, all addresses must fall within the selected Write-Buffer Page. 2. DQ7 may change simultaneously with DQ5. Therefore, DQ7 should be verified. 3. If this flowchart location was reached because DQ5= “1”, then the device FAILED. If this flowchart location was reached because DQ1= “1”, then the Write to Buffer operation was ABORTED. In either case, the proper reset command must be written before the device can begin another operation. If DQ1=1, write the Write-Buffer-Programming-Abort-Reset command. if DQ5=1, write the Reset command. 4. See Table 12 for command sequences required for write buffer programming. (Note 3) (Note 1) (Note 2) |
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