MBM29PL64LM datasheet(27/69 Pages) SPANSION

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MBM29PL64LM90/10

section), at which the devices return to the read mode. Data polling and Toggle Bit must be performed at an

address within any of the sectors being erased.

Erase Suspend/Resume

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 sector 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 maximum

of “tSPD” to suspend the erase operation. When the devices enter 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 suspended. Further

writes of the Erase Suspend command are ignored.

When the erase operation is 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. Reading successively 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.

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.

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

Fast Mode Set/Reset

The device has Fast Mode function. It dispenses with the initial two unclock cycles required in the standard

program command sequence by writing Fast Mode command into the command register. In this mode, the

required bus cycle for programming consists of 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

command other than the Fast program/Fast mode reset command. To exit from this mode, write Fast Mode Reset

command into the command register. (Refer to the “Embedded ProgramTM Algorithm for Fast Mode” in sFLOW

CHART.) The VCC active current is required even CE = VIH during Fast Mode.

Fast Programming

During Fast Mode, the programming can be executed with two bus cycles operation. The Embedded Program

Algorithm is executed by writing program set-up command (A0h) and data write cycles (PA/PD). See “Embedded

ProgramTM Algorithm for Fast Mode” in sFLOW CHART.

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