MBM29PL160BD データシートの表示（PDF） - Fujitsu

部品番号

コンポーネント説明

メーカー

MBM29PL160BD

16M (2M × 8/1M × 16) BIT

Fujitsu 

MBM29PL160TD-75/-90/MBM29PL160BD-75/-90

Multiple sectors may be erased concurrently by writing six-bus cycle operations on Table 7. This sequence is

followed with writes of the Sector Erase command to addresses in other sectors desired to be concurrently

erased. The time between writes must be less than 50 µs otherwise that command will not be accepted and

erasure will start. It is recommended that processor interrupts be disabled during this time to guarantee this

condition. The interrupts can be re-enabled after the last Sector Erase command is written. A time-out of 50 µs

from the rising edge of the last WE will initiate the execution of the Sector Erase command(s). If another falling

edge of the WE 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 section DQ3, Sector Erase Timer.) Any command other than Sector Erase

or Erase Suspend during this time-out period will reset the device to the read mode, ignoring the previous

command string. Resetting the device once excution 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 the Write Operation Status section for

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

number of sectors (0 to 10).

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 (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. (See Figure 8.)

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 17 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

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 Data polling of DQ7 and 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.

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