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January 23, 2006 Am29LV6402M 27 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 and DQ15 may change simultaneously with DQ5 and DQ13. Therefore, DQ7 and DQ15 should be verified. 3. If this flowchart location was reached because DQ5 and DQ13 = “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 and DQ9 =1, write the Write-Buffer-Programming-Abort-Reset command. if DQ5 and DQ13 =1, write the Reset command. 4. required for write buffer programming. |
