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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： | 17/65页 |
| 文件大小： | 2116K |
| 代理商： | S29XS064R0PBHW010 |
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24
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)
in Table 12.3, Command Definitions on page 43. Note that if a Bank Address (BA) on address bits A21, A20,
and A19 for the VS/XS064R are asserted during the third write cycle of the autoselect command, the host
system can read autoselect data that bank and then immediately read array data from the other bank, without
exiting the autoselect mode.
To access the autoselect codes, the host system must issue the autoselect command via the command
register, as shown in Table 12.3, Command Definitions on page 43.
9.12
Sector Protection
The device features sector protection, which can disable both the program and erase operations in certain
sectors.
Dynamic Protection Bit (DYB)
DYB is a security feature used to protect individual sectors from being programmed or erased inadvertently. It
is a volatile protection bit and is assigned to each sector. Upon power-up, the contents of all DYBs are
cleared (erased to “1”). Each DYB can be individually modified through the DYB Set Command or the DYB
Clear Command.
The Protection Status for a particular sector is determined by the status of the DYB relative to that sector. By
issuing the DYB Set or Clear command sequences, the DYBs will be set (programmed to “0”) or cleared
(erased to “1”), thus placing each sector in the protected or unprotected state respectively. These states are
the so-called Dynamic Locked or Unlocked states due to the fact that they can switch back and forth between
the protected and unprotected states. This feature allows software to easily protect sectors against
inadvertent changes yet does not prevent the easy removal of protection when changes are needed. The
DYBs maybe set (programmed to “0”) or cleared (erased to “1”) as often as needed.
When the parts are first shipped, upon power up or reset, the DYBs are cleared (erased to “1”).
Note: Dynamic protection bits revert back to their default values after programming device’s “Lock Register.”
The sectors in the dynamic state are all unprotected. If there is a need to protect some of them, a simple DYB
Set command sequence is all that is necessary. The DYB Set or Clear command for the dynamic sectors
signify protected or unprotected state of the sectors respectively.
If the user attempts to program or erase a protected sector, the device ignores the command and returns to
read mode. A program or erase command to a protected sector enables status polling and returns to read
mode without having modified the contents of the protected sector.
The programming of the DYB for a given sector can be verified by writing individual status read commands
DYB Status.
9.13
Hardware Data Protection Mode
The device offers one type of data protection at the sector level:
When V
PP is at VIL, all sectors are locked
9.14
Low VCC Write Inhibit
When VCC is less than VLKO, the device does not accept any write cycles. This protects data during VCC
power-up and power-down. The command register and all internal program/erase circuits are disabled, and
the device resets to reading array data. Subsequent writes are ignored until VCC is greater than VLKO. The
system must provide the proper signals to the control inputs to prevent unintentional writes when VCC is
greater than VLKO.
9.15
Write Pulse “Glitch” Protection
Noise pulses of less than tWEP on WE# do not initiate a write cycle.
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