MBM29PL65LM90TN datasheet(21/56 Pages) SPANSION

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MBM29PL65LM-90/10

starts first occurs within the “tTOW” 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 execution has begun may 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" section for

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

number of sectors.

Sector erase does not require the user to program 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.

The system can determine the status of the erase operation by using DQ7 (Data Polling), or DQ6 (Toggle Bit).

The sector erase begins after the “tTOW” time out from the rising edge of CE or WE whichever starts first for the

last sector erase command pulse and terminates when the data on DQ7 is “1” at which time the device returns

to the read mode. See "Write Operation Status" section. Data polling and Toggle Bit 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.

Erase Suspend/Resume Command

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

sector not being erased. This command is applicable ONLY during the Sector Erase operation within the time-

out period for Sectore erase.

Writting the Erase Suspend command (B0h) 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 (30h) resumes the erase operation.

When the “Erase Suspend” command is written during the Sector Erase operation, the device takes a maximum

of “tSPD” to suspend the erase operation. When the devices have entered the erase-suspended mode, the RY/

BY output pin will be at High-Z 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 sus-

pended. Further writes of the Erase Suspend command are ignored.

When the erase operation is 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 causes DQ2 to toggle. See the section on DQ2.

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

the Resume command at this point is ignored. Another Erase Suspend command is written after the chip resumes

erasing.

Do not issuing program command after entering erase-suspend-read mode.

Fast Mode Set/Reset Command

Fast Mode function dispenses with the initial two unlock cycles required in the standard program command

sequence writing Fast Mode command into the command register. In this mode the required bus cycle for

programming is two cycles instead of four bus cycles in standard program command. The read operation is also

executed after exiting this mode. During the Fast mode, do not write any commands other than the Fast program/

Fast mode reset command. To exit this mode, write Fast Mode Reset command into the command register.

Refer to "Embedded Program Algorithm for Fast Mode". The VCC active current is required even CE = VIH during

Fast Mode.

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