MBM29LV080A-12PTN 데이터 시트보기 (PDF) - Fujitsu

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MBM29LV080A-12PTN

8M (1M x 8) BIT

Fujitsu 

MBM29LV080A-70/-90/-12

for Sector Erase Timer operation.) Loading the sector erase buffer may be done in any sequence and with any

number of sectors (0 to 15).

Sector erase does not require the user to program the devices 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. Multiple Sector Erase Time; [Sector Program Time (Preprogramming) + Sector Erase

Time] × Number of Sector Erase.

Figure 18 illustrates the Embedded EraseTM Algorithm using typical command strings and bus operations.

Erase Suspend/Resume

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

from or program to a sector not being erased. This command is applicable ONLY during the 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. Writting 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.

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

writing the Erase Suspend or Erase Resume commands.

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

of 20 µs to suspend the erase operation. When the devices have 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 com-

mand sequence for Program. This Program mode is known as the erase-suspend-program mode. Again, pro-

gramming in this mode is the same as programming in the regular 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 devices are 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 the Toggle Bit (DQ6)

which is the same as the regular Program operation. Note that DQ7 must be read from the 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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