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| 型号： | TC58FT321-10 |
| 厂商： | Toshiba Corporation |
| 英文描述： | 32M Bit (2M×16Bits ) CMOS Flash Memory(2M×16位CMOS闪速存储器) |
| 中文描述： | 32兆位（200万× 16位）的CMOS快闪记忆体（200万× 16位的CMOS闪速存储器） |
| 文件页数： | 11/46页 |
| 文件大小： | 518K |
| 代理商： | TC58FT321-10 |
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TC58FVT321/B321FT-10
2000-08-30 11/46
Block Protection
Block Protection is a function for disabling writing and erasing specific blocks. Block protection can be carried
out in two ways: by supplying a high voltage (V
ID
) to the device (see Block protection 1) or by supplying a high
voltage and a command sequence (see Block protection 2).
(1) Block protection 1
Specify a device block address and make the following signal settings A9
=
OE
=
V
ID
, A1
=
V
IH
and CE
=
A0
=
A6
=
V
IL
. Now when a pulse is input to WE for t
PPLH
, the device will start to write to the block
protection circuit. Block protection can be verified using the Verify Block Protect command. Inputting V
IL
on
OE sets the device to Verify Mode. 01H is output if the block is protected and 00H is output if the block is
unprotected. If block protection was unsuccessful, the operation must be repeated. Releasing V
ID
from A9
and OE terminates this mode.
(2) Block protection 2
Applying V
ID
to RESET and inputting the Block Protect 2 command also performs block protection. The
first cycle of the command sequence is the Set-up command. In the second cycle, the Block Protect command
is input, in which a block address and A1
=
V
IH
and A0
=
A6
=
V
IL
are input. Now the device writes to the
block protection circuit. There is a wait of t
PPLH
until this write is completed; however, no intervention is
necessary during this time. In the third cycle the Verify Block Protect command is input. This command
verifies the write to the block protection circuit. Read is performed in the fourth cycle. If the protection
operation is complete, 01H is output. If a value other than 01H is output, block protection is not complete
and the Block Protect command must be input again. Removing the V
ID
input from RESET exits this
mode.
Temporary Block Unprotection
The TC58FVT321/B321 has a temporary block unprotection feature which disables block protection for all
protected blocks. Unprotection is enabled by applying V
ID
to the RESET pin. Now Write and Erase operations
can be performed on all blocks except the boot blocks which have been protected by the Boot Block Protect
operation. The device returns to its previous state when V
ID
is removed from the RESET pin. That is,
previously protected blocks will be protected again.
Verify Block Protect
The Verify Block Protect command is used to ascertain whether a block is protected or unprotected.
Verification is performed either by inputting the Verify Block Protect command or by applying V
ID
to the A9 pin,
as for ID Read Mode, and setting the block address
=
A0
=
A6
=
V
IL
and A1
=
V
IH
. If the block is protected, 01H is
output. If the block is unprotected, 00H is output.
Boot Block Protection
Boot block protection temporarily protects certain boot blocks using a method different from ordinary block
protection. Neither V
ID
nor a command sequence is required. Protection is performed simply by inputting V
IL
on
/ACC
WP
. The target blocks are the two pairs of boot blocks. The top boot blocks are BA69 and BA70; the bottom
boot blocks are BA0 and BA1. Inputting V
IH
on
/ACC
WP
protect these blocks, the ordinary Block Protection Mode must be used.
releases the mode. From now on, if it is necessary to
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