S29GL064A90TFIR4 Spansion Inc., S29GL064A90TFIR4 Datasheet - Page 47

• Manufacturer Part Number: S29GL064A90TFIR4
• Manufacturer: Spansion Inc.

Specifications of S29GL064A90TFIR4

• Cell Type: NOR
• Density: 64Mb
• Access Time (max): 90ns
• Interface Type: Parallel
• Boot Type: Bottom
• Address Bus: 23/22Bit
• Operating Supply Voltage (typ): 3/3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 8M/4M
• Supply Current: 50mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Compliant

7.11
May 21, 2008 S29GL-A_00_A12
7.11.1
Secured Silicon Sector Flash Memory Region
Customer Lockable: Secured Silicon Sector NOT Programmed or Protected
At the Factory
The Secured Silicon Sector feature provides a Flash memory region that enables permanent part
identification through an Electronic Serial Number (ESN). The Secured Silicon Sector is 256 bytes in length,
and uses a Secured Silicon Sector Indicator Bit (DQ7) to indicate whether or not the Secured Silicon Sector is
locked when shipped from the factory. This bit is permanently set at the factory and cannot be changed,
which prevents cloning of a factory locked part. This ensures the security of the ESN once the product is
shipped to the field.
The factory offers the device with the Secured Silicon Sector either customer lockable (standard shipping
option) or factory locked (contact a Spansion sales representative for ordering information). The customer-
lockable version is shipped with the Secured Silicon Sector unprotected, allowing customers to program the
sector after receiving the device. The customer-lockable version also contains the Secured Silicon Sector
Indicator Bit permanently set to a 0. The factory-locked version is always protected when shipped from the
factory, and has the Secured Silicon Sector Indicator Bit permanently set to a 1. Thus, the Secured Silicon
Sector Indicator Bit prevents customer-lockable devices from being used to replace devices that are factory
locked. Note that the ACC function and unlock bypass modes are not available when the Secured Silicon
Sector is enabled.
The Secured Silicon sector address space in this device is allocated as follows:
The system accesses the Secured Silicon Sector through a command sequence (see
on page
Secured Silicon Sector by using the addresses normally occupied by the first sector (SA0). This mode of
operation continues until the system issues the Exit Secured Silicon Sector command sequence, or until
power is removed from the device. On power-up, or following a hardware reset, the device reverts to sending
commands to sector SA0.
Unless otherwise specified, the device is shipped such that the customer may program and protect the 256-
byte Secured Silicon sector.
The system may program the Secured Silicon Sector using the write-buffer, accelerated and/or unlock
bypass methods, in addition to the standard programming command sequence. See
on page
Programming and protecting the Secured Silicon Sector must be used with caution since, once protected,
there is no procedure available for unprotecting the Secured Silicon Sector area and none of the bits in the
Secured Silicon Sector memory space can be modified in any way.
The Secured Silicon Sector area can be protected using one of the following procedures:
Once the Secured Silicon Sector is programmed, locked and verified, the system must write the Exit Secured
Silicon Sector Region command sequence to return to reading and writing within the remainder of the array.
Write the three-cycle Enter Secured Silicon Sector Region command sequence, and then follow the in-
system sector protect algorithm as shown in
V
a high voltage. Note that this method is only applicable to the Secured Silicon Sector.
Write the three-cycle Enter Secured Silicon Sector Region command sequence, and then use the alternate
method of sector protection described in
000008h–00007Fh
000000h–000007h
IH
or V
48). After the system writes the Enter Secured Silicon Sector command sequence, it may read the
52.
x16
ID
. This allows in-system protection of the Secured Silicon Sector without raising any device pin to
Secured Silicon Sector
Address Range
D a t a
000000h-00000Fh
000010h-0000FFh
x8
S h e e t
S29GL-A
Sector Group Protection and Unprotection on page
Figure 7.2 on page
Standard Factory
Unavailable
Locked
ESN
46, except that RESET# may be at either
ESN or determined
Factory Locked
ExpressFlash
Determined by
by customer
customer
Command Definitions
Write Protect (WP#)
Determined by
Customer
41.
Lockable
customer
47