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参数资料
| 型号： | Am29LV400T-90RWACB |
| 厂商： | Advanced Micro Devices, Inc. |
| 英文描述： | 4 Megabit (512 K x 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory |
| 中文描述： | 4兆位（512亩x 8-Bit/256亩x 16位），3.0伏的CMOS只引导扇区闪存 |
| 文件页数： | 3/40页 |
| 文件大小： | 516K |
| 代理商： | AM29LV400T-90RWACB |
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11
Am29LV400
PR EL IMIN AR Y
Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification, and sector protection verification,
through identifier codes output on DQ7–DQ0. This
mode is primarily intended for programming equipment
to automatically match a device to be programmed with
its corresponding programming algorithm. However,
the autoselect codes can also be accessed in-system
through the command register.
When using programming equipment, the autoselect
mode requires VID (11.5 V to 12.5 V) on address pin
A9. Address pins A6, A1, and A0 must be as shown in
Table 4. In addition, when verifying sector protection,
the sector address must appear on the appropriate
4 shows the remaining address bits that are don’t care.
When all necessary bits have been set as required, the
programming equipment may then read the corre-
sponding identifier code on DQ7–DQ0.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 5. This method
details on using the autoselect mode.
Table 4.
Am29LV400 Autoselect Codes (High Voltage Method)
L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
Sector Protection/Unprotection
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both pro-
gram and erase operations in previously protected
sectors.
Sector protection/unprotection is implemented using
programming equipment, and requires VID on address
pin A9 and OE#. Publication number 20873 contains
further details; contact an AMD representative to re-
quest a copy.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
through AMD’s ExpressFlash Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is protected
or unprotected. See “Autoselect Mode” for details.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to VID. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once VID is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 1 shows the algorithm, and
Figure 21 shows the timing diagrams, for this feature.
Description
Mode
CE#
OE#
WE#
A17
to
A12
A11
to
A10
A9
A8
to
A7
A6
A5
to
A2
A1
A0
DQ8
to
DQ15
DQ7
to
DQ0
Manufacturer ID: AMD
L
H
X
VID
XLX
L
X
01h
Device ID:
Am29LV400
(Top Boot Block)
Word
L
H
XX
VID
XLX
L
H
22h
B9h
Byte
L
H
X
B9h
Device ID:
Am29LV400
(Bottom Boot
Block)
Word
L
H
XX
VID
XLX
L
H
22h
BAh
Byte
L
H
X
BAh
Sector Protection Verification
L
H
SA
X
VID
XLX
H
L
X
01h
(protected)
X
00h
(unprotected)
相关PDF资料 |
PDF描述 |
|---|---|
| Am29LV400T-90RWAE | FEEDTHRU CAPACITOR, 470PF 4A 100VFEEDTHRU CAPACITOR, 470PF 4A 100V; Capacitance:0.47nF; Voltage rating, DC:100V; Capacitor dielectric type:Ceramic Multi-Layer; Tolerance, +:50%; Tolerance, -:20%; Temp, op. max:125(degree C); Temp, |
| Am29LV400T-90RWAEB | 4 Megabit (512 K x 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory |
| AM29LV400T-90RWAC | Ceramic Multilayer Capacitor; Capacitance:100pF; Capacitance Tolerance:+50, -20 %; Working Voltage, DC:100V; Dielectric Characteristic:NP0; Package/Case:1206; Series:W3F; Leaded Process Compatible:Yes |
| AM29LV400B-90RWAC | 4 Megabit (512 K x 8-Bit/256 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory |
| Am29LV640DH90RZE | 8 Characters x 2 Lines, 5x7 Dot Matrix Character and Cursor |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AM29LV640DH90REI | 制造商:Spansion 功能描述:FLASH PARALLEL 3V/3.3V 64MBIT 4MX16 90NS 48TSOP - Trays |
| AM29LV640DL90RZI | 制造商:Advanced Micro Devices 功能描述: |
| AM29LV640DU-90NI | 制造商:Advanced Micro Devices 功能描述: |
| AM29LV640DU90REI | 制造商:Spansion 功能描述:FLASH PARALLEL 3V/3.3V 64MBIT 4MX16 90NS 48TSOP - Trays |
| AM29LV640DU-90RWHIT | 制造商:Advanced Micro Devices 功能描述:63-BALL FINE-PITCH BALL GRID ARRAY (FBGA) 0.80 MM PITCH, 11 X 12 MM PACKAGE (FBE063) |
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