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參數(shù)資料
| 型號： | W78M64120SBI |
| 廠商： | MICROSEMI CORP-PMG MICROELECTRONICS |
| 元件分類： | PROM |
| 英文描述： | 8M X 64 FLASH 3.3V PROM, 120 ns, PBGA159 |
| 封裝： | 13 X 22 MM, 1.27 MM PITCH, PLASTIC, BGA-159 |
| 文件頁數(shù)： | 4/50頁 |
| 文件大?。?/td> | 1679K |
| 代理商： | W78M64120SBI |
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White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
W78M64VP-XSBX
November 2009
2010 White Electronic Designs Corp. All rights reserved
Rev. 10
White Electronic Designs Corp. reserves the right to change products or specications without notice.
NOTES
1. If the password mode is chosen, the password must
be programmed before setting the corresponding lock
register bit.
2. After the Lock Register Bits Command Set Entry
command sequence is written, reads and writes for
Sector 0 are disabled, while reads from other sectors
are allowed until exiting this mode.
3. If both lock bits are selected to be programmed (to
zeros) at the same time, the operation aborts.
4. Once the Password Mode Lock Bit is programmed,
the Persistent Mode Lock Bit is permanently disabled,
and no changes to the protection scheme are allowed.
Similarly, if the Persistent Mode Lock Bit is programmed,
the Password Mode is permanently disabled.
After selecting a sector protection method, each sector can
operate in any of the following three states:
1. Constantly locked. The selected sectors are protected
and can not be reprogrammed unless PPB lock bit is
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 unprotected state of the
sectors respectively. However, if there is a need to
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