MX29F200T/B
WRITE OPERATION STATUS DATA
ERASE RESUME
POLLING-Q7
This command will cause the command register to clear
thesuspendstateandreturnbacktoSectorErasemode
but only if an Erase Suspend command was previously
issued. Erase Resume will not have any effect in all
otherconditions.AnotherEraseSuspendcommandcan
be written after the chip has resumed erasing.
The MX29F200T/B also features Data Polling as a
methodtoindicatetothehostsystemthattheAutomatic
Program or Erase algorithms are either in progress or
completed.
While the Automatic Programming algorithm is in
operation, anattempttoreadthedevicewillproducethe
complement data of the data last written to Q7. Upon
completion of the Automatic Program Algorithm an
attempt to read the device will produce the true data last
written to Q7. The Data Polling feature is valid after the
risingedgeofthefourth WEpulseofthefourwritepulse
sequences for automatic program.
SET-UP AUTOMATIC PROGRAM
COMMANDS
To initiate Automatic Program mode, A three-cycle
commandsequenceisrequired. Therearetwo"unlock"
writecycles. ThesearefollowedbywritingtheAutomatic
Program command A0H.
While the Automatic Erase algorithm is in operation, Q7
willread"0"untiltheeraseoperationiscompeted. Upon
completion of the erase operation, the data on Q7 will
read"1". TheDataPollingfeatureisvalidaftertherising
edge of the sixth WE pulse of six write pulse sequences
for automatic chip/sector erase.
Once the Automatic Program command is initiated, the
next WE pulse causes a transition to an active
programming operation. Addresses are latched on the
fallingedge,and dataareinternally latchedon therising
edgeoftheWEpulse. TherisingedgeofWEalsobegins
the programming operation. The system does not
require toprovidefurthercontrolsortimings. Thedevice
will automatically provide an adequate internally
generated program pulse and verify margin.
The Data Polling feature is active during Automatic
Program/Erase algorithm or sector erase time-out.(see
section Q3 Sector Erase Timer)
If the program opetation was unsuccessful, the data on
Q5 is "1"(see Table 4), indicating the program operation
exceedinternaltiminglimit.Theautomaticprogramming
operation is completed when the data read on Q6 stops
togglingfortwoconsecutivereadcyclesandthedataon
Q7 and Q6 are equivalent to data written to these two
bits, at which time the device returns to the Read
mode(no program verify command is required).
RY/BY:Ready/Busy
The RY/BY is a dedicated, open-drain output pin that
indicateswhetheranAutomaticErase/Programalgorithm
is in progress or complete. The RY/BY status is valid
aftertherisingedgeofthefinalWEpulseinthecommand
sequence. SinceRY/BYisanopen-drainoutput,several
RY/BYpinscanbetiedtogetherinparallelwithapull-up
resistor to Vcc.
Iftheoutputsislow(Busy), thedeviceisactivelyerasing
or programming. (This includes programming in the
EraseSuspendmode.) Iftheoutputishigh(Ready), the
device is ready to read array data (including during the
Erase Suspend mode), or is in the standby mode.
P/N:PM0549
REV. 1.3 , DEC. 24, 2001
11
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