28F640W30 NUMONYX [Numonyx B.V], 28F640W30 Datasheet - Page 59

• Manufacturer Part Number: 28F640W30
• Description: Numonyx Wireless Flash Memory (W30)
• Manufacturer: NUMONYX [Numonyx B.V]

Numonyx™ Wireless Flash Memory (W30)
11.0
11.1
November 2007
Order Number: 290702-13
Program Operations
Word Program
When the Word Program command is issued, the WSM executes a sequence of
internally timed events to program a word at the desired address, and to verify that the
bits are sufficiently programmed. Programming the flash memory array changes
specifically addressed bits to 0; 1 bits do not change the memory cell contents.
Programming can occur in only one partition at a time. All other partitions must be in
either a read mode or erase suspend mode. Only one partition can be in erase suspend
mode at a time.
To examine the status register can be examined for program progress, read any
address within the partition that is busy programming. However, while most status
register bits are partition-specific, the Device WSM Status bit, SR[7], is device-specific.
That is, if the status register is read from any other partition, SR[7] indicates the
program status of the entire flash memory device. This status bit permits the system
CPU to monitor the program progress while reading the status of other partitions.
CE# or OE# toggle (during polling) updates the status register. Several commands can
be issued to a partition that is programming: Read Status Register, Program Suspend,
Read Identifier, and Read Query. The Read Array command can also be issued, but the
read data is indeterminate.
After programming completes, three status register bits can signify various possible
error conditions:
After the status register data is examined, clear it using the Clear Status Register
command before issuing a new command. The partition remains in status register
mode until another command is written to that partition. Any command can be issued
after the status register indicates program completion.
If CE# is deasserted while the flash device is programming, the flash devices do not
enter standby mode until the program operation completes.
• SR[4] indicates a program failure if set.
• If SR[3] is set, the WSM could not execute the Word Program
• If SR[1] is set, the program was aborted, because the WSM attempted to program
was outside the acceptable limits.
a locked block.
command, because
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