MBM29LV008BA-90PTR データシートの表示（PDF） - Spansion Inc.

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MBM29LV008BA-90PTR

FLASH MEMORY CMOS 8M (1M × 8) BIT

Spansion Inc. 

MBM29LV008TA/BA-70/90

pulse occurs within the 50 µs time-out window the timer is reset. (Monitor DQ3 to determine if the sector erase

timer window is still open, see “DQ3 Sector Erase Timer”.) Any command other than Sector Erase or Erase

Suspend during this time-out period will reset the devices to the read mode, ignoring the previous command

string. Resetting the devices once execution has begun will corrupt the data in the sector. In that case, restart

the erase on those sectors and allow them to complete. (Refer to “Write Operation Status” for Sector Erase

Timer operation.) Loading the sector erase buffer may be done in any sequence and with any number of sectors

(18 to 0).

Sector erase does not require the user to program the devices prior to erase. The devices automatically program

all memory locations in the sector(s) to be erased prior to electrical erase (Preprogram function). 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 write pulse for the last

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

time the devices return to the read mode. Data polling must be performed at an address within any of the sectors

being erased. Multiple Sector Erase Time : [Sector Erase Time + Sector Program Time (Preprogramming)] ×

Number of Sector Erase

“ (2) Embedded EraseTM Algorithm” in s FLOW CHART illustrates the Embedded EraseTM 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 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 command.

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 devices default 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”DQ2 Toggle Bit II”.)

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

command sequence for 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 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 by the Toggle Bit I

(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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