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AT45DB041D-SU-SL954 参数 Datasheet PDF下载

AT45DB041D-SU-SL954图片预览
型号: AT45DB041D-SU-SL954
PDF下载: 下载PDF文件 查看货源
内容描述: 4兆位2.5伏或2.7伏的DataFlash [4-megabit 2.5-volt or 2.7-volt DataFlash]
分类和应用: 闪存存储内存集成电路光电二极管异步传输模式ATM时钟
文件页数/大小: 53 页 / 1649 K
品牌: ATMEL [ ATMEL ]
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AT45DB041D  
memory is reached, the device will continue reading back at the beginning of the same page. A  
low-to-high transition on the CS pin will terminate the read operation and tri-state the output pin  
(SO). The maximum SCK frequency allowable for the Main Memory Page Read is defined by the  
fSCK specification. The Main Memory Page Read bypasses both data buffers and leaves the  
contents of the buffers unchanged.  
6.5  
Buffer Read  
The SRAM data buffers can be accessed independently from the main memory array, and utiliz-  
ing the Buffer Read Command allows data to be sequentially read directly from the buffers. Four  
opcodes, D4H or D1H for buffer 1 and D6H or D3H for buffer 2 can be used for the Buffer Read  
Command. The use of each opcode depends on the maximum SCK frequency that will be used  
to read data from the buffer. The D4H and D6H opcode can be used at any SCK frequency up to  
the maximum specified by fCAR1. The D1H and D3H opcode can be used for lower frequency  
read operations up to the maximum specified by fCAR2  
.
To perform a buffer read from the DataFlash standard buffer (264 bytes), the opcode must be  
clocked into the device followed by three address bytes comprised of 15 don’t care bits and  
9 buffer address bits (BFA8 - BFA0). To perform a buffer read from the binary buffer (256 bytes),  
the opcode must be clocked into the device followed by three address bytes comprised of  
16 don’t care bits and 8 buffer address bits (BFA7 - BFA0). Following the address bytes, one  
don’t care byte must be clocked in to initialize the read operation. The CS pin must remain low  
during the loading of the opcode, the address bytes, the don’t care bytes, and the reading of  
data. When the end of a buffer is reached, the device will continue reading back at the beginning  
of the buffer. A low-to-high transition on the CS pin will terminate the read operation and tri-state  
the output pin (SO).  
7. Program and Erase Commands  
7.1  
Buffer Write  
Data can be clocked in from the input pin (SI) into either buffer 1 or buffer 2. To load data into the  
DataFlash standard buffer (264 bytes), a 1-byte opcode, 84H for buffer 1 or 87H for buffer 2,  
must be clocked into the device, followed by three address bytes comprised of 15 don’t care bits  
and 9 buffer address bits (BFA8 - BFA0). The 9 buffer address bits specify the first byte in the  
buffer to be written. To load data into the binary buffers (256 bytes each), a 1-byte opcode 84H  
for buffer 1 or 87H for buffer 2, must be clocked into the device, followed by three address bytes  
comprised of 16 don’t care bits and 8 buffer address bits (BFA7 - BFA0). The 8 buffer address  
bits specify the first byte in the buffer to be written. After the last address byte has been clocked  
into the device, data can then be clocked in on subsequent clock cycles. If the end of the data  
buffer is reached, the device will wrap around back to the beginning of the buffer. Data will con-  
tinue to be loaded into the buffer until a low-to-high transition is detected on the CS pin.  
7.2  
Buffer to Main Memory Page Program with Built-in Erase  
Data written into either buffer 1 or buffer 2 can be programmed into the main memory. A 1-byte  
opcode, 83H for buffer 1 or 86H for buffer 2, must be clocked into the device. For the DataFlash  
standard page size (264 bytes), the opcode must be followed by three address bytes consist of  
4 don’t care bits, 11 page address bits (PA10 - PA0) that specify the page in the main memory to  
be written and 9 don’t care bits. To perform a buffer to main memory page program with built-in  
erase for the binary page size (256 bytes), the opcode 83H for buffer 1 or 86H for buffer 2, must  
be clocked into the device followed by three address bytes consisting of 5 don’t care bits  
7
3595L–DFLASH–4/08  
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