tc58fvm5t2a TOSHIBA Semiconductor CORPORATION, tc58fvm5t2a Datasheet - Page 13

• Manufacturer Part Number: tc58fvm5t2a
• Description: 32mbit 4m U 8 Bits/2m U 16 Bits Cmos Flash Memory
• Manufacturer: TOSHIBA Semiconductor CORPORATION

BLOCK PROTECTION
out in two ways: by supplying a high voltage (V
voltage and a command sequence (see Block protection 2).
(1) Block protection 1
(2) Block protection 2
Temporary Block Unprotection
protection for all protected blocks. Unprotection is enabled by applying V
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
That is, previously protected blocks will be protected again.
Verify Block Protect
Verification is performed either by inputting the Verify Block Protect command or by applying V
as for ID Read Mode, and setting the block address A0 A6
is output. If the block is unprotected, 00H is output.
Boot Block Protection
protection. Neither V
on
bottom boot blocks are BA0 and BA1. Inputting V
necessary to protect these blocks, the ordinary Block Protection Mode must be used.
Block Protection is a function for disabling writing and erasing specific blocks. Block protection can be carried
The TC58FVM5T2A/B2A/T3A/B3A has a temporary block unprotection feature which disables block
The Verify Block Protect command is used to ascertain whether a block is protected or unprotected.
Boot block protection temporarily protects certain boot blocks using a method different from ordinary block
WP
protection circuit. Block protection can be verified using the Verify Block Protect command. Inputting V
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
and OE terminates this mode.
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
block protection circuit. There is a wait of t
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
mode.
A0
Specify a device block address and make the following signal settings A9
Applying V
/ACC
A6
. The target blocks are the two pairs of boot blocks. The top boot blocks are BA69 and BA70; the
V
ID
IL
. Now when a pulse is input to WE for t
to RESET and inputting the Block Protect 2 command also performs block protection. The
ID
nor a command sequence is required. Protection is performed simply by inputting V
PPLH
ID
V
IH
) to the device (see Block protection 1) or by supplying a high
IH
and A0
on
until this write is completed; however, no intervention is
WP
/ACC
PPLH
A6
TC58FVM5(T/B)(2/3)A(FT/XB)65
V
IL
, the device will start to write to the block
V
releases the mode. From now on, if it is
and A1
IL
are input. Now the device writes to the
ID
ID
ID
is removed from the RESET pin.
to the RESET pin. Now Write and
input from RESET exits this
V
IH
. If the block is protected, 01H
OE
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V
ID
, A1
ID
V
to the A9 pin,
IH
ID
and CE
from A9
IL
IL