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参数资料
型号： M58WR064KU70ZA6U
厂商： NUMONYX
元件分类： PROM
英文描述： 4M X 16 FLASH 1.8V PROM, 70 ns, PBGA44
封装： 7.50 X 5 MM, 0.50 MM PITCH, ROHS COMPLIANT, VFBGA-44
文件页数： 74/122页
文件大小： 2187K
代理商： M58WR064KU70ZA6U
M58WRxxxKU, M58WRxxxKL
Block locking
55/123
11
Block locking
The M58WRxxxKU/L features an instant, individual block locking scheme that eables any
block to be locked or unlocked with no latency. This locking scheme has three levels of
protection.
●
Lock/unlock - this first level allows software-only control of block locking.
●
Lock-down - this second level requires hardware interaction before locking can be
changed.
●
VPP ≤VPPLK - the third level provides complete hardware protection against program
and erase on all blocks.
The protection status of each block can be set to locked, unlocked, and lock-down. Table 17
defines all of the possible protection states (WP, DQ1, DQ0) and Appendix C: Flowcharts
and pseudocodes, Figure 26, shows a flowchart for the locking operations.
11.1
Reading a block’s lock status
The lock status of every block can be read in the read electronic signature mode of the
device. To enter this mode write 90h to the device. Subsequent reads at the address
specified in Table 8 output the protection status of that block. The lock status is represented
by DQ0 and DQ1. DQ0 indicates the block lock/unlock status and is set by the Lock
command and cleared by the Unlock command. It is also automatically set when entering
lock-down. DQ1 indicates the lock-down status and is set by the Lock-Down command. It
cannot be cleared by software but only by a hardware reset or power-down.
The following sections explain the operation of the locking system.
11.2
Locked state
The default status of all blocks on power-up or after a hardware reset is locked (states
(0,0,1) or (1,0,1)). Locked blocks are fully protected from any program or erase. Any
program or erase operations attempted on a locked block returns an error in the status
register. The status of a locked block can be changed to unlocked or lock-down using the
appropriate software commands. An unlocked block can be locked by issuing the Lock
command.
11.3
Unlocked state
Unlocked blocks (states (0,0,0), (1,0,0) (1,1,0)) can be programmed or erased. All unlocked
blocks return to the locked state after a hardware reset or when the device is powered-
down. The status of an unlocked block can be changed to locked or locked-down using the
appropriate software commands. A locked block can be unlocked by issuing the Unlock
command.
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相关代理商/技术参数
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M58WR064T100ZB6T 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Mbit (4Mb x 16, Multiple Bank, Burst ) 1.8V Supply Flash Memory
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M58WR064T85ZB6T 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Mbit (4Mb x 16, Multiple Bank, Burst ) 1.8V Supply Flash Memory
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