參數(shù)資料
型號(hào)： S29JL032J70TFI213
廠商： SPANSION LLC
元件分類(lèi)： PROM
英文描述： 2M X 16 FLASH 3V PROM, 70 ns, PDSO48
封裝： LEAD FREE, MO-142(D)DD, TSOP-48
文件頁(yè)數(shù)： 21/63頁(yè)
文件大小： 1618K
代理商： S29JL032J70TFI213
28
S29JL032J
S29JL032J_00_05 August 24, 2011
Data
She e t
Figure 8.3 Secured Silicon Region Protect Verify
8.14
Hardware Data Protection
The command sequence requirement of unlock cycles for programming or erasing provides data protection
against inadvertent writes (refer to Table 10.1 on page 38 for command definitions). In addition, the following
hardware data protection measures prevent accidental erasure or programming, which might otherwise be
caused by spurious system level signals during VCC power-up and power-down transitions, or from system
noise.
8.14.1
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 the read mode. Subsequent writes are ignored until VCC is greater than VLKO. The
system must provide the proper signals to the control pins to prevent unintentional writes when VCC is greater
than VLKO.
8.14.2
Write Pulse “Glitch” Protection
Noise pulses of less than 5 ns (typical) on OE#, CE# or WE# do not initiate a write cycle.
8.14.3
Logical Inhibit
Write cycles are inhibited by holding any one of OE# = VIL, CE# = VIH or WE# = VIH. To initiate a write cycle,
CE# and WE# must be a logical zero while OE# is a logical one.
8.14.4
Power-Up Write Inhibit
If WE# = CE# = VIL and OE# = VIH during power up, the device does not accept commands on the rising
edge of WE#. The internal state machine is automatically reset to the read mode on power-up.
Write 60h to
any address
Write 40h to Secure
Silicon Region address
with A6 = 0,
A1 = 1, A0 = 0
START
RESET# =
VIH or VID
Wait 1 ms
Read from Secure
Silicon Region address
with A6 = 0,
A1 = 1, A0 = 0
If data = 00h,
Secure Silicon Region
is unprotected.
If data = 01h,
Secure Silicon Region
is protected.
Remove VIH or VID
from RESET#
Secured Silicon Region
exit command
Secure Silicon Region
Protect Verify
complete
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