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参数资料
| 型号： | DS2431 |
| 元件分类： | DRAM |
| 英文描述： | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| 中文描述： | 该CAT24FC02是一个2 KB的EEPROM的国内256个8位每字举办的串行CMOS |
| 文件页数： | 21/23页 |
| 文件大小： | 170K |
| 代理商： | DS2431 |
DS2431: 1024-Bit, 1-Wire EEPROM
21 of 23
CRC GENERATION
With the DS2431 there are two different types of CRCs. 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 DS2431 to determine if the ROM data has been received error-
free. 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. 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 or reading from the scratchpad. In
contrast to the 8-bit CRC, the 16-bit CRC is always communicated in the inverted form. A CRC generator inside the
DS2431 chip (Figure 13) calculates a new 16-bit CRC, as shown in the command flow chart (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 or to reread the portion of the data with the CRC error.
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 as they were sent by the bus
master. The DS2431 transmits this CRC only if E2:E0 = 111b.
With the Read 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, the E/S byte, and the scratchpad data as they were sent
by the DS2431. The DS2431 transmits this CRC only if the reading continues through the end of the scratchpad.
For more information on generating CRC values, refer to
Application Note 27
.
Figure 13. CRC-16 Hardware Description and Polynomial
Polynomial = X
16
+ X
15
+ X
2
+ 1
X
0
X
1
X
2
X
3
X
4
X
5
X
6
X
7
X
8
X
9
X
10
X
11
X
12
X
13
X
14
X
15
X
16
1
st
STAGE
2
nd
STAGE
3
rd
STAGE
4
th
STAGE
6
th
STAGE
5
th
STAGE
7
th
STAGE
8
th
STAGE
9
th
STAGE
10
th
STAGE
11
th
STAGE
12
th
STAGE
13
th
STAGE
14
th
STAGE
15
th
STAGE
16
th
STAGE
INPUT DATA
CRC
OUTPUT
COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—COLOR CODES
Master to slave
Slave to master
Programming
相关PDF资料 |
PDF描述 |
|---|---|
| DS2431P | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| DS2431X | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| DS2441 | 1-Cell Li-Ion Battery Manager |
| DS2450 | 1-Wire Quad A/D Converter |
| DS2450S | 1-Wire Quad A/D Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2431 R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM |
| DS2431 T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1024-Bit, 1-Wire EEPROM |
| DS2431/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:1024-Bit 1-Wire EEPROM |
| DS2431/T | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:1024-Bit 1-Wire EEPROM |
| DS2431/T&R | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
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