MBM29PL65LM Fujitsu Media Devices, MBM29PL65LM Datasheet - Page 19

• Manufacturer Part Number: MBM29PL65LM
• Description: FLASH MEMORY CMOS 64 M (4M X 16) BIT MirrorFlashTM
• Manufacturer: Fujitsu Media Devices

Program Suspend/Resume Command
Write Buffer Programming Operations
The programming operation is completed when the data on DQ
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 Program
strings and bus operations.
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 s 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 DQ
operation. See “Write Operation Status” for more information. When issuing program suspend command in
4 s after issuing program command, determine the status of program operation by reading status bit at more
4 s 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 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 A
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-
7
or DQ
7
6
is equivalent to data written to this bit at which
status bits, just as in the standard program
3
MBM29PL65LM
to A
0
TM
should be 0h. All subsequent address
Algorithm" using typical command
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