- 您现在的位置：买卖IC网 > PDF目录20431 > AT45DB321C-TU (Atmel)IC FLASH 32MBIT 40MHZ 28TSOP PDF资料下载
参数资料
| 型号： | AT45DB321C-TU |
| 厂商： | Atmel |
| 文件页数： | 14/40页 |
| 文件大小： | 0K |
| 描述： | IC FLASH 32MBIT 40MHZ 28TSOP |
| 标准包装： | 234 |
| 格式 - 存储器： | 闪存 |
| 存储器类型： | DataFLASH |
| 存储容量： | 32M（8192 页 x 528 字节） |
| 速度： | 40MHz |
| 接口： | SPI 3 线串行 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-TSSOP（0.465"，11.8mm 宽） |
| 供应商设备封装： | 28-TSOP |
| 包装： | 托盘 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
7.2
Security Register
The AT45DB321C contains a specialized register that can be used for security purposes in sys-
tem design. The Security Register is a unique 128-byte register that is divided into two portions.
The first 64 bytes (byte 0 to byte 63) of this page are allocated as a one-time user programmable
space. Once these 64 bytes have been programmed, they should not be reprogrammed. The
remaining 64 bytes of this page (byte 64 to byte 127) are factory programmed by Atmel and will
contain a unique number for each device. The factory programmed data is fixed and cannot be
changed.
The Security Register can be read by clocking in a 4-byte sequence 77H, 00H, 00H, 00H to the
device followed by 32 don’t care clock cycles. See the opcode Table 9-4 on page 20 .
Note:
Next generation devices of the “D” family will not require the 32 don’t care clock cycles.
To program the first 64 bytes of the Security Register, a two step sequence must be used. The
first step requires that the user loads the desired data into Buffer 1 by using the Buffer 1 Write
operation (opcode 84H – “Buffer Write” on page 5 ). The user should specify the starting buffer
address as location zero and should write a full 64 bytes of information into the buffer. Other-
wise, the first 64 bytes of the buffer may contain data that was previously stored in the buffer. It
is not necessary to fill the remaining 464 bytes (byte locations 64 through 527) of the buffer with
data. After the Buffer 1 Write operation has been completed, the Security Register can be sub-
sequently programmed by reselecting the device and clocking in opcode 9AH into the device
followed by three don’t care bytes (24 clock cycles). After the final don’t care clock cycle has
been completed, a low-to-high transition on the CS pin will cause the device to initiate an inter-
nally self-timed program operation in which the contents of Buffer 1 will be programmed into the
Security Register. Only the first 64 bytes of data in Buffer 1 will be programmed into the Security
Register; the remaining 464 bytes of the buffer will be ignored. The Security Register program
operation should take place in a maximum time of t P .
7.3
14
Operation Mode Summary
The modes described can be separated into two groups – modes that make use of the Flash
memory array (Group A) and modes that do not make use of the Flash memory array (Group B).
Group A modes consist of:
1. Main Memory Page Read
2. Continuous Array Read
3. Main Memory Page to Buffer 1 (or 2) Transfer
4. Main Memory Page to Buffer 1 (or 2) Compare
5. Buffer 1 (or 2) to Main Memory Page Program with Built-in Erase
6. Buffer 1 (or 2) to Main Memory Page Program without Built-in Erase
7. Main Memory Page Program through Buffer 1 (or 2)
8. Page Erase
9. Block Erase
10. Auto Page Rewrite
Group B modes consist of:
1. Buffer 1 (or 2) Read
2. Buffer 1 (or 2) Write
3. Status Register Read
4. Manufacturer and Device ID Read
AT45DB321C
3387M–DFLASH–2/08
相关PDF资料 |
PDF描述 |
|---|---|
| MIC4429CT | IC DRIVER MOSFET 6A LS TO-220-5 |
| MIC4429CM TR | IC DRIVER MOSFET 6A LS 8-SOIC |
| MLG1005S3N0S | INDUCTOR MULTILAYER 3.0NH 0402 |
| A7VXK-0910G | DSUB CABL-AMU09K/ AE10G / X |
| F910J157MNC | CAP TANT 150UF 6.3V 20% 2917 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT45DB321D | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:2.7V 32Mbit dataflash |
| AT45DB321D_07 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:32-megabit 2.7-volt DataFlash |
| AT45DB321D_08 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:32-megabit 2.7-volt DataFlash |
| AT45DB321D_09 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:32-megabit 2.7-volt DataFlash |
| AT45DB321D_12 | 制造商:AD 制造商全称:Analog Devices 功能描述:32Mb, 2.5V or 2.7V DataFlash |
发布紧急采购，3分钟左右您将得到回复。