SST38VF6402-90-5I-EKE Microchip Technology, SST38VF6402-90-5I-EKE Datasheet - Page 10

• Manufacturer Part Number: SST38VF6402-90-5I-EKE
• Description: 2.7V To 3.6V 64Mbit Pm Parallel Advanced MPF+ 48 TSOP 12x20 Mm TRAY
• Manufacturer: Microchip Technology

Specifications of SST38VF6402-90-5I-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

Data Sheet
After verifying the password, program the DQ
OTP bits of the PSR to explicitly choose Password mode.
Once the Password mode has been selected, the Pass-
word Read and Password Program commands are perma-
nently disabled. There is no longer any method for reading
or modifying the password. In addition, SST is unable to
read or modify the password. If a Password Read com-
mand is issued while in Password mode, the data pre-
sented for each word of the password is FFFFh.
If the Password Mode is not explicitly chosen in the PSR,
then the password can still be read and modified. There-
fore, SST strongly recommends that users explicitly choose
Password Mode in the PSR.
©2009 Silicon Storage Technology, Inc.
9. Read the Global Lock Bit with the Global Lock Bit
Status Read command. The Global Lock bit
should now be ‘1’.
SST38VF6401 / SST38VF6402 / SST38VF6403 / SST38VF6404
2
64 Mbit (x16) Advanced Multi-Purpose Flash Plus
and DQ
1
10
Irreversible Block Locking
The SST38VF6401/6402/6403/6404 provides Irreversible
Block Locking, a feature that allows users to customize the
size of Read-Only Memory (ROM) on the device and pro-
vides more flexibility than One-Time Programmable (OTP)
memory.
Applying Irreversible Block Locking turns user-selected
memory areas into ROM by permanently disabling Pro-
gram and Erase operations to these chosen areas. Any
area that becomes ROM cannot be changed back to Flash.
Any memory blocks in the main memory, including boot
blocks, can be irreversibly locked. In non-uniform boot block
devices (SST38VF6403 and SST38VF6404) each 4 KW
sector in the boot area can be irreversibly locked. If desired,
all blocks in the main memory can be irreversibly locked.
To use Irreversible Block Locking do the following:
The Irreversible Block Lock command can only be used
once. Issuing the command after the first time has no effect
on the device.
Important: Once the Irreversible Block Lock command is
used, the state of the NVPBs can no longer be changed or
overridden. Therefore, the following features no longer
have any effect on the device:
•
•
•
•
•
In addition, WP# has no effect on any memory in the boot
block area that has been irreversibly locked.
To verify whether the Irreversible Block Lock command has
already been issued, enter the Product ID mode and read
address 5FEH. If DQ
already been executed. When using this feature to deter-
mine if a specific block is ROM, use the NVPB Status
Read.
1. Global Lock Bit should be ‘1’. The Irreversible
2. Enter the Non-Volatile Block Protection mode.
3. Use the NVPB Program command to protect only
4. Exit the Non-Volatile Block Protection mode.
5. Issue the Irreversible Block Lock command (see
Block Lock command is disabled when Global
Lock Bit is ‘0’.
the blocks that are to be changed into ROM.
Table 11 for details).
Global Lock of NVPBs feature
Password feature
NVPB Program command
NVPB Erase command
DQ2 and DQ1 of PSR
0
= 0, then Irreversible Block Lock has
S71309-05-000
07/09