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参数资料
| 型号： | S29XS064R0PBHW010 |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 4M X 16 FLASH 1.8V PROM, 80 ns, PBGA44 |
| 封装： | 7.50 X 5 MM, LEAD FREE, FBGA-44 |
| 文件页数： | 19/65页 |
| 文件大小： | 2116K |
| 代理商： | S29XS064R0PBHW010 |
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26
S29VS/XS-R MirrorBit
Flash Family
S29VS_XS064R_00_06 July 22, 2011
Data
Sheet
(Adv an ce
Inf o r m a t io n)
9.20
RESET#: Hardware Reset Input
The RESET# input provides a hardware method of resetting the device to reading array data. When RESET#
is driven low for at least a period of tRP, the device immediately terminates any operation in progress, tristates
all outputs, and ignores all read/write commands for the duration of the RESET# pulse. The device also
resets the internal state machine to reading array data. The operation that was interrupted should be
reinitiated once the device is ready to accept another command sequence, to ensure data integrity.
Current is reduced for the duration of the RESET# pulse. When RESET# is held at VSS, the device draws
CMOS standby current (ICC4). If RESET# is held at VIL but not within VSS, the standby current will be greater.
RESET# may be tied to the system reset circuitry. A system reset would thus also reset the Flash memory,
enabling the system to read the boot-up firmware from the Flash memory.
Refer to the AC Characteristics on page 54 tables for RESET# parameters and to Figure 19.5 on page 58 for
the timing diagram.
VCC Power-up and Power-down Sequencing
The device imposes no restrictions on VCC power-up or power-down sequencing. Asserting RESET# to VIL is
required during the entire VCC power sequence until the respective supplies reach their operating voltages.
Once VCC attains its operating voltage, de-assertion of RESET# to VIH is permitted.
9.21
Output Disable Mode
When the OE# input is at VIH, output from the device is disabled. The outputs are placed in the high
impedance state.
9.22
Secured Silicon Sector Flash Memory Region
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 words in length.
All reads outside of the 256 word address range will return non-valid data. The Factory Indicator Bit (DQ7) is
used to indicate whether or not the Factory Secured Silicon Sector is locked when shipped from the factory.
The Customer Indicator Bit (DQ6) is used to indicate whether or not the Customer Secured Silicon Sector is
locked when shipped from the factory. The Factory Secured Silicon bits are permanently set at the factory
and cannot be changed, which prevents cloning of a factory locked part. This ensures the security of the ESN
and customer code once the product is shipped to the field.
Spansion offers the device with a Factory Secured Silicon Sector that is locked and a Customer Secured
Silicon Sector that is either locked or is lockable. The Factory Secured Silicon Sector is always protected
when shipped from the factory, and has the Factory Indicator Bit (DQ7) permanently set to a “1”. The
Customer Secured Silicon Sector is shipped unprotected, allowing customers to utilize that sector in any
manner they choose. Once the Customer Secured Silicon Sector area is protected, the Customer Indicator
Bit will be permanently set to “1”.
The system accesses the Secured Silicon Sector through a command sequence (see Enter/Exit Secured
Silicon Sector Command Sequence on page 36). After the system has written the Enter Secured Silicon
Sector command sequence, it may read the Secured Silicon Sector by using the addresses normally
occupied by sector SA0 of the memory array. This mode of operation continues until the system issues the
Exit Secured Silicon Sector command sequence, or until power is removed from the device. While Secured
Silicon Sector access is enabled, Memory Array read access, program operations, and erase operations to all
sectors other than SA0 are also available. On power-up, or following a hardware reset, the device reverts to
sending commands to the normal address space.
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