- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄203632 > W78M64VP120SBM (MICROSEMI CORP-PMG MICROELECTRONICS) SPECIALTY MEMORY CIRCUIT, PBGA156 PDF資料下載
參數(shù)資料
| 型號： | W78M64VP120SBM |
| 廠商： | MICROSEMI CORP-PMG MICROELECTRONICS |
| 元件分類： | 存儲器 |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, PBGA156 |
| 封裝： | 13 X 22 MM, PLASTIC, BGA-156 |
| 文件頁數(shù)： | 5/48頁 |
| 文件大小： | 1548K |
| 代理商： | W78M64VP120SBM |
第1頁第2頁第3頁第4頁當(dāng)前第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁
13
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
W78M64VP-XSBX
October 2008
Rev. 2
ADVANCED
White Electronic Designs Corp. reserves the right to change products or specications without notice.
Dynamic Protection Bits
Dynamic Protection Bits are volatile and unique for each
sector and can be individually modied. DYBs only control
the protection scheme for unprotected sectors that have
their PPBs cleared (erased to “1”). By issuing the DYB Set or
Clear command sequences, the DYBs are set (programmed
to “0”) or cleared (erased to “1”), thus placing each sector in
the protected or unprotected state respectively. This feature
allows software to easily protect sectors against inadvertent
changes yet does not prevent the easy removal of protection
when changes are needed.
NOTE
1. The DYBs can be set (programmed to “0”) or cleared
(erased to “1”) as often as needed. When the parts are
rst shipped, the PPBs are cleared (erased to “1”) and
upon power up or reset, the DYBs can be set or cleared
depending upon the ordering option chosen.
2. If the option to clear the DYBs after power up is chosen,
(erased to “1”), then the sectors may be modified
depending upon the PPB state of that sector (see Table
20).
3. The sectors would be in the protected state If the option
to set the DYBs after power up is chosen (programmed
to “0”).
4. It is possible to have sectors that are persistently locked
with sectors that are left in the dynamic state.
5. The DYB Set or Clear commands for the dynamic sectors
signify protected or unprotectedstate of the sectors
respectively. However, if there is a need to change the
status of the persistently locked sectors, a few more steps
are required. First, the PPB Lock Bit must be cleared
by either putting the device through a power-cycle, or
hardware reset. The PPBs can then be changed to
reect the desired settings. Setting the PPB Lock Bit
once again locks the PPBs, and the device operates
normally again.
6. To achieve the best protection, it is recommended to
execute the PPB Lock Bit Set command early in the
boot code and protect the boot code by holding WP#/
ACC = VIL. Note that the PPB and DYB bits have the
same function when WP#/ACC = VHH as they do when
ACC =VIH.
Persistent Protection Bit
Lock Bit
The Persistent Protection Bit Lock Bit is a global volatile
bit for all sectors. When set (programmed to “0”), it locks
all PPBs and when cleared (programmed to “1”), allows
the PPBs to be changed. There is only one PPB Lock Bit
per device.
NOTE
1. No software command sequence unlocks this bit unless
the device is in the password protection mode; only a
hardware reset or a power-up clears this bit.
2. The PPB Lock Bit must be set (programmed to “0”) only
after all PPBs are conFIG:d to the desired settings.
Password Protection Method
The Password Protection Method allows an even higher
level of security than the Persistent Sector Protection Mode
by requiring a 64-bit password for unlocking the device PPB
Lock Bit. In addition to this password requirement, after
power up and reset, the PPB Lock Bit is set “0” to maintain
the password mode of operation. Successful execution
of the Password Unlock command by entering the entire
password clears the PPB Lock Bit, allowing for sector PPBs
modications.
NOTES
1. There is no special addressing order required for
programming the password. Once the Password is written
and veried, the Password Mode Locking Bit must be set
in order to prevent access.
2. The Password Program Command is only capable of
programming “0”s. Programming a “1” after a cell is
programmed as a “0” results in a time-out with the cell
as a “0”.
3. The password is all “1”s when shipped from the factory.
4. All 64-bit password combinations are valid as a
password.
5. There is no means to verify what the password is after
it is set.
6. The Password Mode Lock Bit, once set, prevents reading
the 64-bit password on the data bus and further password
programming.
7. The Password Mode Lock Bit is not erasable.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W78M64VP120SBI | SPECIALTY MEMORY CIRCUIT, PBGA156 |
| W83L761G | DIGITAL TEMP SENSOR-SERIAL |
| W8D-PF29062 | 36 CONTACT(S), FEMALE, STRAIGHT SINGLE PART CARD EDGE CONN, PRESS FIT |
| W8D-PF29063 | 36 CONTACT(S), FEMALE, STRAIGHT SINGLE PART CARD EDGE CONN, PRESS FIT |
| W8D-PF29 | 36 CONTACT(S), FEMALE, STRAIGHT SINGLE PART CARD EDGE CONN, PRESS FIT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78M64V-XSBX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Flash MCP |
| W78NCSX-23 | 功能描述:低信號繼電器 - PCB 4PDT 3A 24VDC IND RoHS:否 制造商:NEC 觸點形式:2 Form C (DPDT-BM) 觸點電流額定值: 線圈電壓:5 V 最大開關(guān)電流:1 A 線圈電流:1 A 線圈類型:Non-Latching 功耗:140 mW 端接類型:SMT 絕緣: 介入損耗: |
| W78PCX-1 | 制造商:Magnecraft 功能描述: |
| W78PCX-2 | 制造商:Magnecraft 功能描述: |
| W78PCX-4 | 制造商:Magnecraft 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。