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TC58FVT160AFT-10 датащи(PDF) 10 Page - Toshiba Semiconductor

номер детали TC58FVT160AFT-10
подробное описание детали  TOSHIBA MOS DIGITAL INTEGRATED CIRCUIT SILICON GATE CMOS
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TC58FVT160AFT-10 датащи(HTML) 10 Page - Toshiba Semiconductor

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TC58FVT160/B160AFT/AXB-70,-10
2002-08-06
10/41
Erase Suspend / Erase Resume Modes
Erase Suspend Mode suspends Auto Block Erase and reads data from or writes data to an unselected block.
The Erase Suspend command is allowed during an auto block erase operation but is ignored in all other oreration
modes .
In Erase Suspend Mode only a Read, Program or Resume command can be accepted. If an Erase Suspend
command is input during an Auto Block Erase, the device will enter Erase Suspend Read Mode after tSUSE. The
device status (Erase Suspend Read Mode) can be verified by checking the Hardware Sequence flag. If data is
read consecutively from the block selected for Auto Block Erase, the DQ2 output will toggle and the DQ6 output
will stop toggling and
BY
/
RY
will be set to High-Impedance.
Inputting a Write command during an Erase Suspend enables a Write to be performed to a block which has not
been selected for the Auto Block Erase. Data is written in the usual manner.
To resume the Auto Block Erase, input an Erase Resume command. On receiving an Erase Resume command,
the device returns to the state it was in when the Erase Suspend command was input. If an Erase Suspend
command is input during the Erase Hold Time, the device will return to the state it was in at the start of the
Erase Hold Time. At this time more blocks can be specified for erasing. If an Erase Resume command is input
during an Auto Block Erase, Erase resumes. At this time toggle output of DQ6 resumes and 0 is output on
BY
/
RY
.
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 (VID) 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 = VID, A1 = VIH and CE
= A0 = A6 = VIL. Now when a pulse is input to WE for tPPLH, the device will start to write to the block
protection circuit. Block protection can be verified using the Verify Block Protect command. Inputting VIL 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 VID from A9
and OE terminates this mode.
(2) Block protection 2
Applying VID 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 = VIH and A0 = A6 = VIL are input. Now the device writes to the
block protection circuit. There is a wait of tPPLH 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 VID input from RESET exits this
mode.
Temporary Block Unprotection
The TC58FVT160/B160A has a temporary block unprotection feature which disables block protection for all
protected blocks. Unprotection is enabled by applying VID to the RESET pin. Now Write and Erase operations
can be performed on all blocks. The device returns to its previous state when VID 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 VID to the A9 pin,
as for ID Read Mode, and setting the block address = A0 = A6 = VIL and A1 = VIH. If the block is protected, 01H is
output. If the block is unprotected, 00H is output.


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