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DS2433
CRC GENERATION
With the DS2433 there are two different types of CRCs (Cyclic Redundancy Checks). One CRC is an 8-
bit type and is stored in the most significant byte of the 64-bit ROM. The bus master can compute a CRC
value from the first 56 bits of the 64-bit ROM and compare it to the value stored within the DS2433 to
determine if the ROM data has been received error-free by the bus master. The equivalent polynomial
function of this CRC is: X 8 + X 5 + X 4 + 1. This 8-bit CRC is received in the true (noninverted) form
when reading the ROM of the DS2433. It is computed at the factory and lasered into the ROM.
The other CRC is a 16-bit type, generated according to the standardized CRC16-polynomial function x 16 +
x 15 +x 2 + 1. This CRC is used for fast verification of a data transfer when writing to the scratchpad. It is the
same type of CRC as is used with NV RAM based iButtons? for error detection within the iButton
Extended File Structure. In contrast to the 8-bit CRC, the 16-bit CRC is always returned or sent in the
complemented (inverted) form. A CRC-generator inside the DS2433 chip (Figure 12) will calculate a new
16-bit CRC as shown in the command flowchart of Figure 7. The bus master compares the CRC value
read from the device to the one it calculates from the data and decides whether to continue with an
operation.
With the Write Scratchpad command the CRC is generated by first clearing the CRC generator and then
shifting in the command code, the Target Addresses TA1 and TA2 and all the data bytes. The DS2433
will transmit this CRC only if the data bytes written to the scratchpad include scratchpad ending offset
11111b. The data may start at any location within the scratchpad.
For more details on generating CRC values including example implementations in both hardware and
software, refer to the Book of iButton Standards.
Figure 12. CRC-16 HARDWARE DESCRIPTION AND POLYNOMIAL
(POLYNOMIAL X 16 + X 15 + X 2 + 1)
iButton is a registered trademark of Maxim Integrated Products, Inc.
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相关代理商/技术参数
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制造商:Maxim Integrated Products 功能描述:- Tape and Reel
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制造商:Maxim Integrated Products 功能描述:IC EEPROM 4KBIT 6FLIPCHIP
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功能描述:IC EEPROM 4KBIT 6FCHIP RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:150 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:4K (2 x 256 x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:2.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-DFN（2x3） 包装:管件 产品目录页面:1445 (CN2011-ZH PDF)
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功能描述:电可擦除可编程只读存储器
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制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:4K-Bit 1-Wire EEPROM
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制造商:Maxim Integrated Products 功能描述:IC EEPROM 4KBIT 8SOIC