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参数资料
| 型号： | Am29F040B-70PEB |
| 厂商： | Advanced Micro Devices, Inc. |
| 英文描述： | 4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory |
| 中文描述： | 4兆位（512亩× 8位）的CMOS 5.0伏只，统一部门快闪记忆体 |
| 文件页数： | 5/30页 |
| 文件大小： | 403K |
| 代理商： | AM29F040B-70PEB |
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Am29F040B
13
P R E L I M I NARY
WRITE OPERATION STATUS
The device provides several bits to determine the sta-
tus of a write operation: DQ2, DQ3, DQ5, DQ6, and
DQ7. Table 5 and the following subsections describe
the functions of these bits. DQ7 and DQ6 each offer a
method for determining whether a program or erase
operation is complete or in progress. These three bits
are discussed first.
DQ7: Data# Polling
The Data# Polling bit, DQ7, indicates to the host
sys tem whether an Embe dded Algor ith m is in
progress or completed, or whether the device is in
Erase Suspend. Data# Polling is valid after the rising
edge of the final WE# pulse in the program or erase
command sequence.
During the Embedded Program algorithm, the device
outputs on DQ7 the complement of the datum pro-
grammed to DQ7. This DQ7 status also applies to pro-
g r amm i n g dur ing Er a s e S u s p end. W h e n the
Embedded Program algorithm is complete, the device
outputs the datum programmed to DQ7. The system
must provide the program address to read valid status
information on DQ7. If a program address falls within a
protected sector, Data# Polling on DQ7 is active for ap-
proximately 2 s, then the device returns to reading
array data.
During the Embedded Erase algorithm, Data# Polling
produces a “0” on DQ7. When the Embedded Erase al-
gorithm is complete, or if the device enters the Erase
Suspend mode, Data# Polling produces a “1” on DQ7.
This is analogous to the complement/true datum output
described for the Embedded Program algorithm: the
erase function changes all the bits in a sector to “1”;
prior to this, the device outputs the “complement,” or
“0.” The system must provide an address within any of
the sectors selected for erasure to read valid status in-
formation on DQ7.
After an erase command sequence is written, if all sec-
tors selected for erasing are protected, Data# Polling
on DQ7 is active for approximately 100 s, then the de-
vice returns to reading array data. If not all selected
sectors are protected, the Embedded Erase algorithm
erases the unprotected sectors, and ignores the se-
lected sectors that are protected.
When the system detects DQ7 has changed from the
complement to true data, it can read valid data at
DQ7–DQ0 on the following read cycles. This is be-
ca u s e DQ 7 may ch a n g e a syn ch ro n o u s ly wit h
DQ0–DQ6 while Output Enable (OE#) is asserted low.
The Data# Polling Timings (During Embedded Algo-
rithms) figure in the “AC Characteristics” section illus-
trates this.
Table 5 shows the outputs for Data# Polling on DQ7.
Figure 3 shows the Data# Polling algorithm.
DQ7 = Data?
Yes
No
DQ5 = 1?
No
Yes
FAIL
PASS
Read DQ7–DQ0
Addr = VA
Read DQ7–DQ0
Addr = VA
DQ7 = Data?
START
Notes:
1. VA = Valid address for programming. During a sector
erase operation, a valid address is an address within any
sector selected for erasure. During chip erase, a valid
address is any non-protected sector address.
2. DQ7 should be rechecked even if DQ5 = “1” because
DQ7 may change simultaneously with DQ5.
21445B-8
Figure 3.
Data# Polling Algorithm
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AM29F040B-90EC | 制造商:Advanced Micro Devices 功能描述:NOR Flash, 512K x 8, 32 Pin, Plastic, TSSOP |
| AM29F040B-90ED | 制造商:Spansion 功能描述:Bulk 制造商:Spansion 功能描述:IC FLASH 4MB SMD 29F040 TSOP32 |
| AM29F040B-90EE | 制造商:Advanced Micro Devices 功能描述: |
| AM29F040B-90EF | 功能描述:闪存 4M (512Kx8) 90ns 5v Parallel NOR 闪存 RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
| AM29F040B90EI | 制造商:AMD 功能描述:* |
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