SST38VF6401-90-5I-EKE Microchip Technology, SST38VF6401-90-5I-EKE Datasheet - Page 9

• Manufacturer Part Number: SST38VF6401-90-5I-EKE
• Description: 2.7V To 3.6V 64Mbit Pm Parallel Advanced MPF+ 48 TSOP 12x20 Mm TRAY
• Manufacturer: Microchip Technology

Specifications of SST38VF6401-90-5I-EKE

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 64M (4M x 16)
• Speed: 90ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TFSOP (0.472", 12.0mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

64 Mbit (x16) Advanced Multi-Purpose Flash Plus
SST38VF6401 / SST38VF6402 / SST38VF6403 / SST38VF6404
should be used to set the NVPBs of any blocks that are to
be protected before exiting the Non-Volatile Block Protec-
tion mode. See Table 11 and Figure 32 for further details.
Upon a power cycle or hardware reset, the NVPBs retain
their states. Memory areas that are protected using Non-
Volatile Block Protection remain protected. The NVPB Pro-
gram and NVPBs Erase commands are permanently dis-
abled once the Irreversible Block Lock command is issued.
See “Irreversible Block Locking” on page 10 for further
information.
Advanced Protection
The SST38VF6401/6402/6403/6404 provide Advanced
Protection features that allow users to implement condi-
tional access to the NVPBs. Specifically, Advanced Protec-
tion uses the Global Lock Bit to protect the NVPBs. If the
Global Lock bit is ‘0’ then all the NVPBs states are frozen
and cannot be modified in any mode. If the Global Lock bit
is ‘1’, then all the NVPBs can be modified in Non-Volatile
Block Protection mode. After using the Global Lock of
NVPBs Entry command to enter the Global Lock of NVPBs
mode, the Global Lock Bit can be activated by issuing a Set
Global Lock Bit command, which sets the Global Lock Bit to
‘0’. The Global Lock bit cannot be set to ‘1’ with this com-
mand. The status of the bit can be read with the Global
Lock Bit Status command. Use the Global Lock of NVPBs
Exit command to exit Global Lock of NVPBs mode. See
Table 11 and Figure 33 for further details.
The steps used to change the Global Lock Bit from '0' to'1,'
to allow access to the NVPBs, depend on whether the
device has been set to use Pass-Through or Password
mode. When using Advanced Protection, select either
Pass-Through only mode or Password only mode by pro-
gramming the DQ
factory default is Pass-Through mode (DQ
the user should explicitly chose either Pass-Through only
mode (DQ
0, DQ
in the factory default Pass-Through mode leaves the device
open to unauthorized changes of DQ
PSR. See “Protection Settings Register (PSR)” on page 8.
for more information about the PSR.
Pass-Through Mode (DQ
The Pass-Through Mode allows the Global Lock Bit state
to be cleared to ‘1’ by a power-down power-up sequence or
a hardware reset (RST# pin = 0). No password is required
in Pass-Through mode.
To set the Global Lock Bit to ‘0’, use the Set Global Lock Bit
command while in the Global Lock of NVPBs mode. Select
©2009 Silicon Storage Technology, Inc.
1
= 1). Keeping the SST38VF6401/6402/6403/6404
2
= 1, DQ
2
and DQ
1
= 0), or Password only mode (DQ
1
2
bits in the PSR. Although the
, DQ
1
= 1,0)
2
and DQ
2
= 1, DQ
1
1
in the
= 1),
2
=
9
the Pass-Through only mode by programming PSR bit
DQ
Password Mode (DQ
In the Password Mode, the Global Lock Bit is set to ‘0’ by
the Set Global Lock Bit command, a power-down power-up
sequence, or a hardware reset (RST# pin = 0). Select the
Password only mode by programming PSR bit DQ
and DQ
is issued in Password mode, the Global Lock bit is auto-
matically set to ‘0’.
In contrast to the Pass-Through Mode, in the Password
mode, the only way to clear the Global Lock Bit to ‘1’ is to
submit the correct 64-bit password using the Submit Pass-
word command in Password Commands Mode. The words
of the password can be submitted in any order as long as
each 16 bit section of the password is matched with its cor-
rect address. After the entire 64 bit password is submitted,
the device takes approximately 2 µs to verify the password.
A subsequent Submit Password command cannot be
issued until this verification time has elapsed.
The 64-bit password must be chosen by the user before
programming the DQ
choose Password Mode. The default 64 bit password on
the device from the factory is FFFFFFFFFFFFFFFFh.
Enter the Password Commands mode by issuing the Pass-
word Commands Entry command. Then, use the Pass-
word Program command to program the desired password.
Use caution when programming the password because
there is no method to reset the password to
FFFFFFFFFFFFFFFFh. Once a password bit has been set
to ‘0’, it cannot be changed back to ‘1’. See Table 11 for fur-
ther details about Password-related commands.
The password can be read using the Password Read com-
mand to verify the desired password has been pro-
grammed. SST recommends testing the password before
permanently choosing Password Mode.
To test the password, do the following:
1. Enter the Global Lock of NVPBs mode.
2. Set the Global Lock Bit to ‘0’, and verify the value.
3. Exit the Global Lock of NVPBs mode.
4. Enter the Password Commands mode.
5. Submit the 64-bit password with the Submit Pass-
6. Wait 2 µs for the device to verify the password.
7. Exit the Password Commands mode.
8. Re-enter the Global Lock of NVPBs mode
2
word command.
= 1 and DQ
1
= 1. Note that when the PSR Program command
1
= 0.
2
2
and DQ
, DQ
1
= 0,1)
1
OTP bits of the PSR to
S71309-05-000
Data Sheet
2
07/09
= 0