th50vsf2580 TOSHIBA Semiconductor CORPORATION, th50vsf2580 Datasheet - Page 25

• Manufacturer Part Number: th50vsf2580
• Description: Sram And Flash Memory Mixed Multi-chip Package
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Block Protection
Applying V
the command sequence is the Setup command. In the second cycle, the Block Protect command is input, in
which a block address and A1 = V
protector circuit, Until write is complete, there must be a wait of t
during this time. In the third cycle, the Verify Block Protect command is input. This command verifies write to
the block protector circuit. Read is performed in the fourth cycle. If the protection operation is complete, 01H is
output. If other than 01H is output, write is not complete; thus, input the Block Protect command again.
Canceling V
Temporary Block Unprotection
all protected blocks. Unprotection is enabled by applying V
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
previously protected blocks will be protected again.
Verify Block Protect
is set by setting A0, A6 and the block address A19~A12 to V
input before a Read operation is performed. 0001H is output if the block is protected and 0000H is output if the
block is unprotected. In Byte Mode DQ8 to DQ15 are in High-Impedance state. Block protection verification can
also be carried out using a software command.
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 to disable write and erase in block units.
The TC58VSF2580/2581AASB has a temporary block unprotection feature which disables block protection for
The Verify Block Protect command is used to ascertain whether a block is protected or unprotected. This mode
Boot block protection temporarily protects certain boot blocks using a method different from ordinary block
WP
/ACC
ID
ID
. The target blocks are the two pairs of boot blocks. The top boot blocks are BA69 and BA70; the
to RESET and inputting the Block Protect command performs block protection. The first cycle of
to RESET exits this mode.
ID
nor a command sequence is required. Protection is performed simply by inputting V
IH
and A0 = A6 = V
IH
IL
on
are input. At this time, the device writes to the block
WP
IL
ID
/ACC
and setting A1 to V
ID
to the RESET pin. Now Write and Erase
PPLH
is removed from the RESET pin. That is,
releases the mode. From now on, if it is
TH50VSF2580/2581AASB
but the device need not be controlled
IH
. This command should be
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IL