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AS29F040-70TC Datasheet(PDF) 7 Page - Alliance Semiconductor Corporation |
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AS29F040-70TC Datasheet(HTML) 7 Page - Alliance Semiconductor Corporation |
7 / 18 page ® $65<)373 $65<)373 $65<)373 $65<)373 ','#440533440$1#728233 ','#440533440$1#728233 ','#440533440$1#728233 ','#440533440$1#728233 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 :::: 0DUFK#5333 0DUFK#5333 0DUFK#5333 0DUFK#5333 6WDWXV#RSHUDWLRQV :ULWH#RSHUDWLRQ#VWDWXV 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 algorithm (0 during erase algorithm); reflects true data when read after completion of an automated on-chip algorithm (1 after completion of erase agorithm). Toggle bit 1 (DQ6) Active during automated on-chip algorithms or sector time outs. DQ6 toggles when CE or OE toggles, or an Erase Resume command is invoked. When the automated on-chip algorithm is complete, DQ6 stops toggling and valid data can be read. 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 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; CE powers the device down to 2 mA. If DQ5 = 1 during chip erase, all or some sectors are defective; during 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); during byte programming, that particular byte is defective. 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 additional 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 In progress Auto programming (byte) DQ7 Toggle 0 0 No toggle Program/erase in auto erase 0 Toggle 0 1 Toggle* * Toggles with OE or CE only for erasing or erase suspended sector addresses. Erase suspend mode Read erasing sector 1 No toggle 0 0 Toggle Read non-erasing sector Data Data Data Data Data Program in erase suspend DQ7 Toggle 0 0 Toggle * Exceeded time limits Auto programming (byte) DQ7 Toggle 1 0 No toggle Program/erase in auto erase 0 Toggle 1 1 Toggle † † Toggles with OE or CE only for erasing or erase suspended sector addresses. Program in erase suspend DQ7 Toggle 1 0 No toggle† |
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