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PC48F4400PLVB0 数据表(PDF) 75 Page - Numonyx B.V |
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PC48F4400PLVB0 数据表(HTML) 75 Page - Numonyx B.V |
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75 / 102 page  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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