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PC48F4400P0RB0 数据表(PDF) 75 Page - Numonyx B.V

部件名 PC48F4400P0RB0
功能描述  Numonyx Wireless Flash Memory (W18)
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制造商  NUMONYX [Numonyx B.V]
网页  http://www.numonyx.com
标志 NUMONYX - Numonyx B.V

PC48F4400P0RB0 数据表(HTML) 75 Page - Numonyx B.V

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November 2007
Datasheet
Order Number: 290701-18
75
Numonyx™ Wireless Flash Memory (W18)
The protection register shares some of the same internal flash resources as the
parameter partition. Therefore, RWW is only allowed between the protection register
and main partitions. Table 29 describes the operations allowed in the protection
register, parameter partition, and main partition during RWW and RWE.
13.2.1
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 Table 24, “Device Identification Codes” on
page 56. The protection register is read from the Read Identifier command and can be
read in any partition.Writing the Read Array command returns the device to read-array
mode.
13.2.2
Programing the Protection Register
The Protection Program command should be issued only at the parameter (top or
bottom) partition followed by the data to be programmed at the specified location. It
programs the upper 64 bits of the protection register 16 bits at a time. Table 24,
“Device Identification Codes” on page 56 shows allowable addresses. See also
Figure 33, “Protection Register Programming Flowchart” on page 76. Issuing a
Protection Program command outside the register’s address space results in a Status
Register error (SR[4]=1).
13.2.3
Locking the Protection Register
PR-LK.0 is programmed to 0 by Numonyx to protect the unique device number. PR-LK.1
can be programmed by the user to lock the user portion (upper 64 bits) of the
protection register (See Figure 34, “Protection Register Locking). This bit is set using
the Protection Program command to program “FFFDh” into PR-LK.
After PR-LK register bits are programmed (locked), the protection register’s stored
values can’t be changed. Protection Program commands written to a locked section
result in a Status Register error (SR[4]=1, SR[5]=1).
Table 29: Simultaneous Operations Allowed with the Protection Register
Protection
Register
Parameter
Partition
Array Data
Main
Partitions
Description
Read
See
Description
Write/Erase
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.
See
Description
Read
Write/Erase
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.
Read
Read
Write/Erase
While programming or erasing in a main partition, read operations are allowed
in the parameter partition. Accessing the protection registers in a partition that
is different from the one being programmed or erased, and also different from
the parameter partition, is allowed.
Write
No Access
Allowed
Read
While programming the protection register, reads are only allowed in the other
main partitions. Access to the parameter partition is not allowed. This is
because programming of the protection register can only occur in the
parameter partition, so it will exist in status mode.
No Access
Allowed
Write/Erase
Read
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.


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