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參數(shù)資料
| 型號(hào)： | S71AL016M40 |
| 廠商： | Spansion Inc. |
| 英文描述： | Stacked Multi-Chip Product (MCP) Flash Memory and RAM |
| 中文描述： | 堆疊式多芯片產(chǎn)品（MCP）的閃存和RAM |
| 文件頁(yè)數(shù)： | 26/68頁(yè) |
| 文件大小： | 728K |
| 代理商： | S71AL016M40 |
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26
S71AL016M
S71AL016M_M0 A0 February 23, 2005
A d v a n c e I n f o r m a t i o n
tem protection of the SecSi Sector without raising any device pin to a high
voltage. Note that this method is only applicable to the SecSi Sector.
To verify the protect/unprotect status of the SecSi Sector, follow the algo-
rithm shown in
Figure 3, on page 26
.
Once the SecSi Sector is programmed, locked and verified, the system must
write the Exit SecSi Sector Region command sequence to return to reading and
writing within the remainder of the array.
Factory Locked: SecSi Sector Programmed and Protected At the
Factory
In devices with an ESN, the SecSi Sector is protected when the device is shipped
from the factory. The SecSi Sector cannot be modified in any way. An ESN Fac-
tory Locked device has a 16-byte random ESN at addresses given in
Table 5 on
page 25
. Please contact your local sales office or representative for details on or-
dering ESN Factory Locked devices.
Customers may opt to have their code programmed by the manufacturer
through the ExpressFlash service (Express Flash Factory Locked). The devices
are then shipped from the factory with the SecSi Sector permanently locked.
Contact an sales office or representative for details on using the ExpressFlash
service.
Figure 3. SecSi Sector Protect Verify
Common Flash Memory Interface (CFI)
The Common Flash Interface (CFI) specification outlines device and host system
software interrogation handshake, which allows specific vendor-specified soft-
ware algorithms to be used for entire families of devices. Software support can
then be device-independent, JEDEC ID-independent, and forward- and back-
ward-compatible for the specified flash device families. Flash vendors can
standardize their existing interfaces for long-term compatibility.
Write 60h to
any address
Write 40h to SecSi
Sector address
with A6 = 0,
A1 = 1, A0 = 0
START
RESET# =
V
IH
or V
ID
Wait 1 ms
Read from SecSi
Sector address
with A6 = 0,
A1 = 1, A0 = 0
If data = 00h,
SecSi Sector is
unprotected.
If data = 01h,
SecSi Sector is
protected.
Remove V
IH
or V
ID
from RESET#
Write reset
command
SecSi Sector
Protect Verify
complete
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