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參數(shù)資料
| 型號： | M58WR064HU70ZB6U |
| 元件分類： | PROM |
| 英文描述： | 4M X 16 FLASH 1.8V PROM, 70 ns, PBGA44 |
| 封裝： | 7.70 X 9 MM, 0.50 MM PITCH, ROHS COMPLIANT, VFBGA-44 |
| 文件頁數(shù)： | 68/117頁 |
| 文件大?。?/td> | 2300K |
| 代理商： | M58WR064HU70ZB6U |
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Block locking
M58WR064HU M58WR064HL
54/117
11
Block locking
The M58WR064HU/L features an instant, individual block locking scheme that allows 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 offers a 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 15, defines all of the possible protection states (WP, DQ1, DQ0), and Appendix C,
Figure 29, 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 6, will 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, 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 will return 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M58WR064KB70ZB6E | 制造商:Micron Technology Inc 功能描述:WIRELESS FLASH VFBGA 7.7X9.0X1.0 56 8X7 0.75 - Trays 制造商:Micron Technology Inc 功能描述:IC FLASH 64MBIT 70NS 56VFBGA |
| M58WR064KB70ZB6F | 制造商:Micron Technology Inc 功能描述:FLASH 28F640W18TD 60 VF-PBGA56 SB48 EX - Tape and Reel |
| M58WR064KB70ZB6F TR | 制造商:Micron Technology Inc 功能描述:IC FLASH 64MBIT 70NS 56VFBGA |
| M58WR064KB7AZB6E | 制造商:Micron Technology Inc 功能描述:WIRELESS - Trays 制造商:Micron Technology Inc 功能描述:IC FLASH 64MBIT 70NS 56VFBGA |
| M58WR064KB7AZB6F | 制造商:Micron Technology Inc 功能描述:WIRELESS - Tape and Reel |
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