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AS29LV800T-80TI Datasheet(PDF) 10 Page - ANADIGICS, Inc |
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AS29LV800T-80TI Datasheet(HTML) 10 Page - ANADIGICS, Inc |
10 / 25 page AS29LV800 ® 3/22/01; V.1.0 Alliance Semiconductor P. 10 of 25 March 2001 Status operations Write operation status DQ2 toggles when an erase-suspended sector is read repeatedly. DQ6 toggles when any address is read repeatedly. DQ2 = 1 if byte address being programmed is read during erase-suspend program mode. †DQ2 toggles when the read address applied points to a sector which is undergoing erase, suspended erase, or a failure to erase. DATA polling (DQ7) Only active during automated on-chip algorithms or sector erase time outs. DQ7 reflects complement of data last written when read during the automated on-chip program algorithm (0 during erase algorithm); reflects true data when read after completion of an automated on-chip program algorithm (1 after completion of erase agorithm). Toggle bit 1 (DQ6) Active during automated on-chip algorithms or sector erase time outs. DQ6 toggles when CE or OE toggles, or an Erase Resume command is invoked. DQ6 is valid after the rising edge of the fourth pulse of WE during programming; after the rising edge of the sixth WE pulse during chip erase; after the last rising edge of the sector erase WE pulse for sector erase. For protected sectors, DQ6 toggles for <1 µs during program mode writes, and <5 µs during erase (if all selected sectors are protected). Exceeding time limit (DQ5) Indicates unsuccessful completion of program/erase operation (DQ5 = 1). DATA polling remains active. If DQ5 = 1 during chip erase, all or some sectors are defective; during byte programming or sector erase, the sector is defective (in this case, reset the device and execute a program or erase command sequence to continue working with functional sectors). Attempting to program 0 to 1 will set DQ5 = 1. Sector erase timer (DQ3) Checks whether sector erase timer window is open. If DQ3 = 1, erase is in progress; no commands will be accepted. If DQ3 = 0, the device will accept sector erase commands. Check DQ3 before and after each Sector Erase command to verify that the command was accepted. Toggle bit 2 (DQ2) During sector erase, DQ2 toggles with OE or CE only during an attempt to read a sector being erased. During chip erase, DQ2 toggles with OE or CE for all addresses. If DQ5 = 1, DQ2 toggles only at sector addresses where failure occurred, and will not toggle at other sector addresses. Use DQ2 in conjunction with DQ6 to determine whether device is in auto erase or erase suspend mode. Status DQ7 DQ6 DQ5 DQ3 DQ2 RY/BY Standard mode Auto programming DQ7 Toggle 0 N/A No toggle 0 Program/erase in auto erase 0 Toggle 0 1 Toggle† 0 Erase suspend mode Read erasing sector 1 No toggle 0 N/A Toggle 1 Read non-erasing sector Data Data Data Data Data 1 Program in erase suspend DQ7 Toggle 0 N/A Toggle † 0 Exceeded time limits Auto programming (byte) DQ7 Toggle 1 N/A No toggle 1 Program/erase in auto erase 0 Toggle 1 N/A Toggle † 1 Program in erase suspend (non-erase suspended sector) DQ7 Toggle 1 N/A No toggle 1 |
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