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參數(shù)資料
| 型號： | AM29F040B-90PIB |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory |
| 中文描述： | 512K X 8 FLASH 5V PROM, 90 ns, PDIP32 |
| 封裝： | PLASTIC, DIP-32 |
| 文件頁數(shù)： | 15/30頁 |
| 文件大?。?/td> | 403K |
| 代理商： | AM29F040B-90PIB |
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Am29F040B
15
P R E L I M I N A R Y
The DQ5 failure condition may appear if the system
tries to program a “1” to a location that is previously pro-
grammed to “0.”
Only an erase operation can change
a “0” back to a “1.”
Under this condition, the device
halts the operation, and when the operation has ex-
ceeded the timing limits, DQ5 produces a “1.”
Under both these conditions, the system must issue the
reset command to return the device to reading array
data.
DQ3: Sector Erase Timer
After writing a sector erase command sequence, the
system may read DQ3 to determine whether or not an
erase operation has begun. (The sector erase timer
does not apply to the chip erase command.) If addi-
tional sectors are selected for erasure, the entire time-
out also applies after each additional sector erase
command. When the time-out is complete, DQ3
switches from “0” to “1.” The system may ignore DQ3
if the system can guarantee that the time between ad-
ditional sector erase commands will always be less
than 50 μs. See also the “Sector Erase Command Se-
quence” section.
After the sector erase command sequence is written,
the system should read the status on DQ7 (Data# Poll-
ing) or DQ6 (Toggle Bit I) to ensure the device has ac-
cepted the command sequence, and then read DQ3. If
DQ3 is “1”, the internally controlled erase cycle has be-
gun; all further commands (other than Erase Suspend)
are ignored until the erase operation is complete. If
DQ3 is “0”, the device will accept additional sector
erase commands. To ensure the command has been
accepted, the system software should check the status
of DQ3 prior to and following each subsequent sector
erase command. If DQ3 is high on the second status
check, the last command might not have been ac-
cepted. Table 5 shows the outputs for DQ3.
START
No
Yes
Yes
DQ5 = 1
No
Yes
Toggle Bit
= Toggle
No
Program/Erase
Operation Not
Complete, Write
Reset Command
Program/Erase
Operation Complete
Read DQ7–DQ0
Toggle Bit
= Toggle
Read DQ7–DQ0
Twice
Read DQ7–DQ0
Notes:
1. Read toggle bit twice to determine whether or not it is
toggling. See text.
2. Recheck toggle bit because it may stop toggling as DQ5
changes to “1”. See text.
21445B-9
Figure 4.
Toggle Bit Algorithm
(Notes
1, 2)
Note 1
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PDF描述 |
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| AM29F040B-120PC | 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory |
| Am29F040B-120PE | 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory |
| Am29F040B-120PI | 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AM29F080B-120EC | 制造商:Advanced Micro Devices 功能描述: |
| AM29F080B-120EF | 制造商:Spansion 功能描述:NOR Flash Parallel 5V 8Mbit 1M x 8bit 120ns 40-Pin TSOP |
| AM29F080B-120SC | 制造商:Spansion 功能描述:IC,EEPROM,NOR FLASH,1MX8,CMOS,SOP,44PIN,PLASTIC |
| AM29F080B-120SC/T | 制造商:Spansion 功能描述:FLASH PARALLEL 5V 8MBIT 1MX8 120NS 44SOIC - Rail/Tube |
| AM29F080B-55EF | 功能描述:閃存 8M (1MX8) 55ns 5v Parallel NOR 閃存 RoHS:否 制造商:ON Semiconductor 數(shù)據(jù)總線寬度:1 bit 存儲類型:Flash 存儲容量:2 MB 結構:256 K x 8 定時類型: 接口類型:SPI 訪問時間: 電源電壓-最大:3.6 V 電源電壓-最小:2.3 V 最大工作電流:15 mA 工作溫度:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
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