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参数资料
| 型号： | AT49BV802A |
| 厂商： | Atmel Corp. |
| 英文描述： | 8-megabit (512K x 16/ 1M x 8) 3-volt Only Flash Memory |
| 中文描述： | 8兆位（为512k × 16 / 1米× 8）3伏，只有闪存 |
| 文件页数： | 5/29页 |
| 文件大小： | 253K |
| 代理商： | AT49BV802A |
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5
AT49BV802A(T)
3405C–FLASH–9/04
DATA POLLING:
The AT49BV802A(T) features Data Polling to indicate the end of a program
cycle. If the status configuration register is set to a “00”, during a program cycle an attempted
read of the last byte/word loaded will result in the complement of the loaded data on I/O7.
Once the program cycle has been completed, true data is valid on all outputs and the next
cycle may begin. During a chip or sector erase operation, an attempt to read the device will
give a “0” on I/O7. Once the program or erase cycle has completed, true data will be read from
the device. Data Polling may begin at any time during the program cycle. Please see “Status
Bit Table” on page 10 for more details.
If the status bit configuration register is set to a “01”, the I/O7 status bit will be low while the
device is actively programming or erasing data. I/O7 will go high when the device has com-
pleted a program or erase operation. Once I/O7 has gone high, status information on the other
pins can be checked.
The Data Polling status bit must be used in conjunction with the erase/program and V
PP
status
bit as shown in the algorithm in Figures 1 and 2 on page 8.
TOGGLE BIT:
In addition to Data Polling the AT49BV802A(T) provides another method for
determining the end of a program or erase cycle. During a program or erase operation, suc-
cessive attempts to read data from the memory will result in I/O6 toggling between one and
zero. Once the program cycle has completed, I/O6 will stop toggling and valid data will be
read. Examining the toggle bit may begin at any time during a program cycle. Please see “Sta-
tus Bit Table” on page 10 for more details.
The toggle bit status bit should be used in conjunction with the erase/program status bit as
shown in the algorithm in Figures 3 and 4 on page 9.
ERASE/PROGRAM STATUS BIT:
The device offers a status bit on I/O5, which indicates
whether the program or erase operation has exceeded a specified internal pulse count limit. If
the status bit is a “1”, the device is unable to verify that an erase or a byte/word program oper-
ation has been successfully performed. If a program (Sector Erase) command is issued to a
protected sector, the protected sector will not be programmed (erased). The device will go to a
status read mode and the I/O5 status bit will be set high, indicating the program (erase) opera-
tion did not complete as requested. Once the erase/program status bit has been set to a “1”,
the system must write the Product ID Exit command to return to the read mode. The
erase/program status bit is a “0” while the erase or program operation is still in progress.
Please see “Status Bit Table” on page 10 for more details.
SECTOR LOCKDOWN:
Each sector has a programming lockdown feature. This feature pre-
vents programming of data in the designated sectors once the feature has been enabled.
These sectors can contain secure code that is used to bring up the system. Enabling the lock-
down feature will allow the boot code to stay in the device while data in the rest of the device is
updated. This feature does not have to be activated; any sector’s usage as a write-protected
region is optional to the user.
At power-up or reset, all sectors are unlocked. To activate the lockdown for a specific sector,
the six-bus cycle Sector Lockdown command must be issued. Once a sector has been locked
down, the contents of the sector is read-only and cannot be erased or programmed.
SECTOR LOCKDOWN DETECTION:
A software method is available to determine if program-
ming of a sector is locked down. When the device is in the software product identification
mode (see “Software Product Identification Entry/Exit” sections on page 22), a read from
address location 00002H within a sector will show if programming the sector is locked down. If
the data on I/O0 is low, the sector can be programmed; if the data on I/O0 is high, the program
lockdown feature has been enabled and the sector cannot be programmed. The software
product identification exit code should be used to return to standard operation.
相关PDF资料 |
PDF描述 |
|---|---|
| AT49BV802A-70CI | 8-megabit (512K x 16/ 1M x 8) 3-volt Only Flash Memory |
| AT49BV802A-70TI | 8-megabit (512K x 16/ 1M x 8) 3-volt Only Flash Memory |
| AT49BV802AT | 8-megabit (512K x 16/ 1M x 8) 3-volt Only Flash Memory |
| AT49BV802AT-70CI | 8-megabit (512K x 16/ 1M x 8) 3-volt Only Flash Memory |
| AT49BV802AT-70TI | 8-megabit (512K x 16/ 1M x 8) 3-volt Only Flash Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT49BV802A-70CI | 功能描述:闪存 8M TOP BOOT- 8M BTTM BOOT 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 |
| AT49BV802A-70CI SL383 | 功能描述:IC FLASH 8MBIT 70NS 48CBGA RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1 系列:- 格式 - 存储器:RAM 存储器类型:SDRAM 存储容量:256M（8Mx32） 速度:143MHz 接口:并联 电源电压:3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 封装/外壳:90-VFBGA 供应商设备封装:90-VFBGA（8x13） 包装:托盘 其它名称:Q2841869 |
| AT49BV802A-70CI-T | 功能描述:IC FLASH 8MBIT 70NS 48CBGA 制造商:microchip technology 系列:- 包装:带卷（TR） 零件状态:停產 存储器类型:非易失 存储器格式:闪存 技术:FLASH 存储容量:8Mb （1M x 8，512K x 16） 写周期时间 - 字，页:200μs 访问时间:70ns 存储器接口:并联 电压 - 电源:2.65 V ~ 3.6 V 工作温度:-40°C ~ 85°C（TC） 安装类型:表面贴装 封装/外壳:48-VFBGA，CSBGA 供应商器件封装:48-CBGA（6x8） 基本零件编号:AT49BV802 标准包装:2,500 |
| AT49BV802A-70CU | 功能描述:闪存 8M TOP BOOT- 8M BTTM BOOT 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 |
| AT49BV802A-70TI | 功能描述:闪存 8M TOP BOOT- 8M BTTM BOOT 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 |
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