W39V040FC Datasheet, PDF (10/36 Pages) Winbond – 512K × 8 CMOS FLASH MEMORY WITH FWH INTERFACE

W39V040FC
6.13 DQ5: Exceeded Timing Limits
DQ5 indicates whether the program or erase time has exceeded a specified internal pulse count limit.
DQ5 produces “1” under these conditions which indicates that the program or erase cycle was not
successfully completed.
The device may output “1” on DQ5 if the system tries to program “1” to a location that was previously
programmed to “0.” Only the erase operation can change “0” back to “1.” Under this condition, the
device stops the operation, and while the timing limit has been exceeded, DQ5 produces “1.”
Under both these conditions, the system must hardware reset to return to the read mode.
6.14 Identification Input pin ID[3:0]
These pins are part of mechanism that allows multiple parts to be used on the same bus. The boot
device should be 0000b. And all the subsequent parts should use the up-count strapping.
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