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AM29LV160B 데이터시트(PDF) 22 Page - Advanced Micro Devices

부품명 AM29LV160B
상세설명  16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

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Am29LV160B
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to Table 9 for com-
mand 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.
Low VCC Write Inhibit
When VCC is less than VLKO, the device does not ac-
cept 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. Subsequent writes are ignored
until VCC is greater than VLKO. The system must pro-
vide the proper signals to the control pins to prevent
unintentional writes when VCC is greater than VLKO.
Write Pulse “Glitch” Protection
Noise pulses of less than 5 ns (typical) on OE#, CE#
or WE# do not initiate a write cycle.
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.
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 automati-
cally reset to reading array data on power-up.
Table 8.
Primary Vendor-Specific Extended Query
Addresses
(Word Mode)
Addresses
(Byte Mode)
Data
Description
40h
41h
42h
80h
82h
84h
0050h
0052h
0049h
Query-unique ASCII string “PRI”
43h
86h
0031h
Major version number, ASCII
44h
88h
0030h
Minor version number, ASCII
45h
8Ah
0000h
Address Sensitive Unlock
0 = Required, 1 = Not Required
46h
8Ch
0002h
Erase Suspend
0 = Not Supported, 1 = To Read Only, 2 = To Read & Write
47h
8Eh
0001h
Sector Protect
0 = Not Supported, X = Number of sectors in per group
48h
90h
0001h
Sector Temporary Unprotect
00 = Not Supported, 01 = Supported
49h
92h
0004h
Sector Protect/Unprotect scheme
01 = 29F040 mode, 02 = 29F016 mode,
03 = 29F400 mode, 04 = 29LV800A mode
4Ah
94h
0000h
Simultaneous Operation
00 = Not Supported, 01 = Supported
4Bh
96h
0000h
Burst Mode Type
00 = Not Supported, 01 = Supported
4Ch
98h
0000h
Page Mode Type
00 = Not Supported, 01 = 4 Word Page, 02 = 8 Word Page


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