28F640W30 NUMONYX [Numonyx B.V], 28F640W30 Datasheet - Page 76

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

Table 26: Simultaneous Operations Allowed with the Protection Register
13.2.1
13.2.2
13.2.3
Datasheet
76
Protection
Description
No Access
Register
Allowed
Write
Read
Read
See
Array Data
Reading the Protection Register
Writing the Read Identifier command allows the protection register data to be read 16
bits at a time from addresses shown in
page
read in any partition.Writing the Read Array command returns the flash device to read-
array mode.
Programing the Protection Register
Issue the Protection Program command only at the parameter partition followed by the
data to be programmed at the specified location. This command programs the upper 64
bits of the protection register 16 bits at a time.
Codes” on page 55
Programming Flowchart” on page
the address space of the register results in a status register error (SR[4]=1).
Locking the Protection Register
After PR-LK register bits are programmed (locked), the stored values in the protection
register cannot be changed. Protection Program commands written to a locked section
result in a status register error (SR[4]=1, SR[5]=1).
Parameter
Write/Erase
Description
No Access
Partition
• PR-LK.0 is programmed to 0 by Numonyx to protect the unique flash device
• PR-LK.1 can be programmed by the user to lock the user portion (upper 64 bits) of
Allowed
Read
Read
See
number.
the protection register (See
using the Protection Program command to program a value of FFFDh into PR-LK.
55. The protection register is read from the Read Identifier command, and can be
Write/Erase
Write/Erase
Write/Erase
Partitions
Main
Read
Read
shows allowable addresses. See also
While programming or erasing in a main partition, the protection register can
be read from any other partition. Reading the parameter partition data is not
allowed if the protection register is being read from addresses within the
parameter partition.
While programming or erasing in a main partition, read operations are allowed
in the parameter partition. Accessing the protection registers from parameter
partition addresses is not allowed.
While programming or erasing in a main partition, read operations are allowed
in the parameter partition. Accessing the protection registers is allowed, but
only in a partition that is different from the partition being programmed or
erased, and also different from the parameter partition.
While programming the protection register, reads are allowed only in the other
main partitions. Access to the parameter partition is not allowed, because
programming of the protection register can occur only in the parameter
partition, so that the parameter partition exists in status mode.
While programming or erasing the parameter partition, reads of the protection
registers are not allowed in any partition. Reads in other main partitions are
supported.
Figure 36, “Protection Register
77. Issuing a Protection Program command outside
Table 20, “Flash Device Identification Codes” on
Table 20, “Flash Device Identification
Description
Numonyx™ Wireless Flash Memory (W30)
Numonyx™ Wireless Flash Memory (W30)
Figure 35, “Protection Register
Locking). This bit is set
Order Number: 290702-13
November 2007