th50vsf3580aasb TOSHIBA Semiconductor CORPORATION, th50vsf3580aasb Datasheet - Page 25

• Manufacturer Part Number: th50vsf3580aasb
• Description: Sram Flash Memory Mixed Multi-chip Package
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Block Protect
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
circuit, Until write is complete, there must be a wait of t
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 the blocks except the boot blocks protected by Boot Block Protect. The device
returns to the previous condition after V
blocks are 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. V
Block, BA0/BA1. Inputting V
block protection mode.
RESET exits this mode.
WP
Block Protection is a function to disable write and erase in block units.
The TC58VSF3580/3581AASB 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 some boot blocks using a method other than ordinary block
/ACC
. The target blocks are two of the boot blocks. The Top Boot Block uses BA69/BA70; the Bottom Boot
ID
ID
to RESET and inputting the Block Protect command performs block protection. The first cycle of
or a command sequence is not required. Protection is performed simply by inputting V
IH
IH
and A0 = A6 = V
to
WP
/ACC
ID
is removed from the RESET pin. That is, previously protected
releases the mode. At this time, the block is protected in ordinary
IL
are input. At this time, the device writes to the block protector
PPLH
ID
IL
to the RESET pin. At this time, Write and Erase
but the device need not be controlled during this
and setting A1 to V
TH50VSF3580/3581AASB
IH
. This command should be
2001-03-06 25/50
IL
ID
to
to