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參數(shù)資料
| 型號： | W78M32VP110BM |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | PROM |
| 英文描述： | 8M X 32 FLASH 3.3V PROM, 110 ns, PBGA159 |
| 封裝： | 13 X 22 MM, 1.27 MM PITCH, PLASTIC, BGA-159 |
| 文件頁數(shù)： | 4/51頁 |
| 文件大?。?/td> | 1637K |
| 代理商： | W78M32VP110BM |
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12
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
W78M32VP-XBX
January 2010
Rev. 12
White Electronic Designs Corp. reserves the right to change products or specications without notice.
cleared via a password, hardware reset, or power cycle.
2. Dynamically locked. The selected sectors are protected
and can be altered via software commands.
3. Unlocked. The sectors are unprotected and can be
erased and/or programmed.
PERSISTENT PROTECTION BITS
The Persistent Protection Bits are unique and nonvolatile for
each sector and have the same endurances as the Flash
memory. Preprogramming and verication prior to erasure
are handled by the device, and therefore do not require
system monitoring.
NOTES
1. Each PPB is individually programmed and all are erased
in parallel.
2. While programming PPB for a sector, array data can
be read from any other sector, except Sector 0 (used
for Data# Polling) and the sector in which sector PPB
is being programmed.
3. Entry command disables reads and writes for the sector
selected.
4. Reads within that sector return the PPB status for that
sector.
5. All Reads must be performed using the read mode.
6. The specic sector address (A22-A16) are written at
the same time as the program command.
7. If the PPB Lock Bit is set, the PPB Program or erase
command does not execute and times-out without
programming or erasing the PPB.
8. There are no means for individually erasing a specic
PPB and no specic sector address is required for this
operation.
9. Exit command must be issued after the execution which
resets the device to read mode and reenables reads
and writes for Sector 0.
10. The programming state of the PPB for a given sector
can be veried by writing a PPB Status Read Command
to the device as described by the ow chart shown in
FIG: 9.
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.
NOTES
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78M32VP-110BM | 制造商:White Electronic Designs 功能描述:Flash Module Parallel 256Mbit |
| W78M32V-XBX | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:8Mx32 Flash 3.3V Page Mode Simultaneous Read/Write Operation Multi-Chip Package |
| W78M64VP110SBM | 制造商:Microsemi Corporation 功能描述:8MX64 FLASH 3.3V PAGE MODE - Bulk |
| 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: |
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