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參數(shù)資料
| 型號(hào)： | DS2433X |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Programmable ROM |
| 英文描述： | 4K X 1 1-WIRE SERIAL EEPROM, UUC2 |
| 封裝： | DIE |
| 文件頁(yè)數(shù)： | 9/19頁(yè) |
| 文件大?。?/td> | 457K |
| 代理商： | DS2433X |
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DS2433
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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+ X5+ X4+ 1. This 8-bit CRC is received in the true (non-inverted) 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+x2+ 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 flow chart 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, see the Book of DS19xx iButton Standards.
CRC-16 HARDWARE DESCRIPTION AND POLYNOMIAL Figure 12
(Polynomial X
16+ X15+ X2+ 1)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2433S | 512 X 8 1-WIRE SERIAL EEPROM, PDSO8 |
| DS2434S | SPECIALTY MEMORY CIRCUIT, PDSO16 |
| DS2434 | SPECIALTY MEMORY CIRCUIT, PBCY3 |
| DS2435 | SPECIALTY MEMORY CIRCUIT, PBCY3 |
| DS2436B | SPECIALTY MEMORY CIRCUIT, PBCY3 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 532HB622M080BG | 制造商:SILABS 制造商全稱:SILABS 功能描述:DUAL FREQUENCY XO (10 MHZ TO 1.4 GHZ) |
| 532HB622M080BGR | 制造商:SILABS 制造商全稱:SILABS 功能描述:DUAL FREQUENCY XO (10 MHZ TO 1.4 GHZ) |
| 532HEX | 制造商:Belden Inc 功能描述: |
| 532JA622M080BG | 制造商:SILABS 制造商全稱:SILABS 功能描述:DUAL FREQUENCY XO (10 MHZ TO 1.4 GHZ) |
| 532JA622M080BGR | 制造商:SILABS 制造商全稱:SILABS 功能描述:DUAL FREQUENCY XO (10 MHZ TO 1.4 GHZ) |
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