TC58FVM6T5BTG65 Toshiba, TC58FVM6T5BTG65 Datasheet - Page 18

• Manufacturer Part Number: TC58FVM6T5BTG65
• Description: IC FLASH 64MBIT 65NS 48TSOP
• Manufacturer: Toshiba

Specifications of TC58FVM6T5BTG65

• Format - Memory: FLASH
• Memory Type: FLASH - Nor
• Memory Size: 64M (8Mx8, 4Mx16)
• Speed: 65ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

10.18.5. Description of Password Protection Command
(1) Password Program Command
(2) Password Verify Command
(3) Password Unlock Command
to perform Password Unlock command, the exact Password is necessary. It is necessary to input password unlock
command at intervals of 2us or more. If the interval is shorter than 2us, the command is ignored.
address A1:A0 is 0:0 at 4th write bus cycle, A1:A0 is 0:1 at 5th write bus cycle, A1:A0 is 1;0 at 6th write bus cycle, and
finally A1:A0 is 1:1 at 7th write bus cycle. A wrong Password input at the Password Unlock sequence causes mismatch of
Password and PPB Lock Bit is not changed.
status of password unlock operation can be checked by hardware sequence flags. Then flags are output by specifying the
address of Bank0 (Bottom Boot Block) or Bank7 (Top Boot Block). Inputting address of the other Bank then, actual cell
array data is output. The hardware sequence flags indicate whether exact password is inputted at 4-6th write bus cycles
by intervals of 2us or more. During inputting password at 4-7th write bus cycles, DQ6 is toggling. When the first
Password Unlock is successful,
the Password Unlock Command operation completes, the user has to perform Hidden ROM Exit command. PPB Lock Bit
should be read in order to check whether Password Unlock has completed successfully.
scheme. The actual Password length is 64-bits. The 64-bits password is split to four of 16-bits Password Program. In
Password Protection Mode, Password Program and Password verify are disabled. During programming the Password,
Simultaneous Operation is disabled. Read operations to any memory location is available after completion of the
password programming. The status of password program operation can be checked by hardware sequence flags. When
this mode is finished, the hosts have to execute the Hidden ROM Exit command. Password is set as four words of
“FFFFh” at the time of shipment.
In Progress
Program Complete
Program Failed
Password Protection Mode Lock is not programmed. In Password Protection Mode, if the user attempts to verify the
Password, the device output "FFFFh". The hosts have to execute the Hidden ROM Entry command before Password
Verify. During verification the Password, Simultaneous Operation is disabled. At the forth bus write cycle of Password
Verify Command, the hosts have to fix the two address bits (A1, A0). When this mode is finished, the hosts have to
execute the Hidden ROM Exit command.
The Hardware Sequence Flags of the Password Program
The Password Unlock Command clears the PPB Lock Bit when the user sets the Password Protection Mode. In order
At Password Unlock Command the 64-bits password is input in four step at 4th, 5th, 6th, 7th write bus cycles. The
When the Password Unlock Command is entered, the
The Password Protect Command permits programming the password that is used as part of the Hardware Protection
The Password Verify Command is verify the Password. Verification of a Password can be performed when the
DQ7
0
1
0
RY
Toggle
Toggle
/
DQ6
BY
1
pin is LOW and DQ6 stop toggling. Then user can input next password. When
DQ5
0
0
1
DQ4
0
0
0
RY
/
BY
DQ3
pin is Low, which is indicating the device is busy. The
0
0
0
TC58FVM6(T/B)5B(TG/XG)65
DQ2
1
1
1
DQ1
0
0
0
DQ0
0
0
0
2006-05-10 18/80
RY
High-Z
0
0
/
BY