MBM29F080A datasheet(16/44 Pages) SPANSION

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MBM29F080A-55/-70/-90

Sector erase does

not require the user to program the device prior to erase. The device automatically programs

all memory locations in the sector(s) to be erased prior to electrical erase. When erasing a sector or sectors the

remaining unselected sectors are not affected. The system is

not required to provide any controls or timings

during these operations.

The automatic sector erase begins after the 50

µs time out from the rising edge of the WE pulse for the last

sector erase command pulse and terminates when the data on DQ7 is “1” (see Write Operation Status section)

at which time the device returns to the read mode. Data polling must be performed at an address within any of

the sectors being erased.

“Embedded EraseTM Algorithm” in “sFLOW CHART” illustrates the Embedded Erase™ Algorithm using typical

command strings and bus operations.

Erase Suspend

The Erase Suspend command allows the user to interrupt a Sector Erase operation and then perform data reads

from or programs to a sector not being erased. This command is applicable ONLY during a Sector Erase operation

which includes the time-out period for sector erase. The Erase Suspend command will be ignored if written

during the Chip Erase operation or Embedded Program Algorithm. Writing the Erase Suspend command during

the Sector Erase time-out results in immediate termination of the time-out period and suspension of the erase

operation.

Any other command written during the Erase Suspend mode will be ignored except the Erase Resume command.

Writing the Erase Resume command resumes the erase operation. The addresses are DON’T CARES when

writing the Erase Suspend or Erase Resume command.

When the Erase Suspend command is written during the Sector Erase operation, the device will take a maximum

of 15

µs to suspend the erase operation. When the device has entered the erase-suspended mode, the RY/BY

output pin and the DQ7 bit will be at logic “1”, and DQ6 will stop toggling. The user must use the address of the

erasing sector for reading DQ6 and DQ7 to determine if the erase operation has been suspended. Further writes

of the Erase Suspend command are ignored.

When the erase operation has been suspended, the device defaults to the erase-suspend-read mode. Reading

data in this mode is the same as reading from the standard read mode except that the data must be read from

sectors that have not been erase-suspended. Successively reading from the erase-suspended sector while the

device is in the erase-suspend-read mode will cause DQ2 to toggle. (See the section on DQ2.)

After entering the erase-suspend-read mode, the user can program the device by writing the appropriate

command sequence for Byte Program. This program mode is known as the erase-suspend-program mode.

Again, programming in this mode is the same as programming in the regular Byte Program mode except that

the data must be programmed to sectors that are not erase-suspended. Successively reading from the erase-

suspended sector while the device is in the erase-suspend-program mode will cause DQ2 to toggle. The end of

the erase-suspended program operation is detected by the RY/BY output pin, Data polling of DQ7, or by the

Toggle Bit I (DQ6) which is the same as the regular Byte Program operation. Note that DQ7 must be read from

the Byte Program address while DQ6 can be read from any address.

To resume the operation of Sector Erase, the Resume command (30h) should be written. Any further writes of

the Resume command at this point will be ignored. Another Erase Suspend command can be written after the

chip has resumed erasing.

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