MBM29PL65LM90TN datasheet(19/56 Pages) SPANSION

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MBM29PL65LM-90/10

The programming operation is completed when the data on DQ7 is equivalent to data written to this bit at which

the devices return to the read mode and plogram addresses are no longer latched. Therefore, the devices require

that a valid address to the devices be supplied by the system at this particular instance. Hence Data Polling

requires the same address which is being programmed.

If hardware reset occurs during the programming operation, the data being written is not guaranteed.

Programming is allowed in any sequence and across sector boundaries. Beware that a data “0” cannot be

programmed back to a “1”. Attempting to do so may either hang up the device or result in an apparent success

according to the data polling algorithm but a read from Reset mode will show that the data is still “0”. Only erase

operations can convert from “0”s to “1”s.Refer to "Embedded ProgramTM Algorithm" using typical command

strings and bus operations.

Program Suspend/Resume Command

The Program Suspend command allows the system to interrupt a program operation so that data can be read

from any address. Writing the Program Suspend command (B0h) during the Embedded Program operation

immediately suspends the programming. The bank addresses of sector being programmed should be set when

writing the Program Suspend command.

When the Program Suspend command is written during a programming process, the device halts the program

operation within 1

µs and updates the status bits.

After the program operation has been suspended, the system can read data from any address. The data at

program-suspended address is not valid. Normal read timing and command definitions apply.

After the Program Resume command (30h) is written, the device reverts to programming. The bank addresses

of sectors being suspended should be set when writing the Program Resume command. The system can

determine the program operation status using the DQ7 or DQ6 status bits, just as in the standard program

operation. See “Write Operation Status” for more information. When issuing program suspend command in

µs after issuing program command, determine the status of program operation by reading status bit at more

µs after issuing program resume command.

The system may also write the Autoselect command sequence in the Program Suspend mode.

The device allows reading Autoselect codes at the addresses within programming sectors, since the codes are

not stored in the memory. When the device exits from the Autoselect mode, the device reverts to the Program

Suspend mode, and is ready for another valid operation. See “Autoselect Command Sequence” for more infor-

mation.

The system must write the Program Resume command to exit from the Program Suspend mode and continue

programming operation. Further writes of the Resume command are ignored. Another Program Suspend com-

mand can be written after the device resumes programming.

Do not read CFI code after HiddenROM Entry and Exit in program suspend mode.

Write Buffer Programming Operations

Write Buffer Programming allows the system write to series of 16 words in one programming operation. This

results in faster effective word programming time than the standard programming algorithms. The Write Buffer

Programming command sequence is initiated by first writing two unlock cycles. This is followed by a third write

cycle selecting the Sector Address in which programming will occur. In forth cycle contains both Sector Address

and unique code for data bus width will be loaded into the page buffer at the Sector Address in which programming

will occur.

The system then writes the starting address/data combination. This “starting address” must be the same Sector

Address used in third and fourth cycles and its lower addresses of A3 to A0 should be 0h. All subsequent address

must be incremented by 1. Addresses are latched on the falling edge of CE or WE, whichever happens later

and the data is latched on the rising edge of CE or WE, whichever happens first. The rising edge of CE or WE

(whichever happens first) starts programming. Upon executing the Write Buffer Programming Operations com-

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