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型號(hào)：	MQ80C32-20
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 20 MHz, MICROCONTROLLER, CQFP44
封裝：	CERAMIC, QFP-44
文件頁(yè)數(shù)：	174/1185頁(yè)
文件大?。?/td>	5451K
代理商：	MQ80C32-20

SAM9G45 [DATASHEET]

6438K–ATARM–12-Feb-13

SAM9G45 Errata - Rev. B Parts

Boot ROM

Boot ROM: NAND Flash boot does not support ECC Correction

The boot ROM allows booting from block 0 of a NAND Flash connected on CS3. However, the boot ROM does not

feature ECC correction on a NAND Flash.

Most of the NAND Flash vendors do not guarantee anymore that block 0 is error free. Therefore we advise to

locate the bootstrap program into another device supported by the boot ROM (DataFlash, Serial Flash, SDCARD

or EEPROM), and to implement a NAND Flash access with ECC.

Problem Fix/Workaround

Boot ROM: Boot issue on AT45-series SPI dataflash

The boot from AT45-series SPI DataFlash is not functional except for the AT45DB321D. Future revisions of the

AT45DB321D might not be functional either.

Problem Fix/Workaround

Use AT25-series serial Flash instead.

Error Corrected Code Controller (ECC)

ECC: Computation with a 1 clock cycle long NRD/NWE pulse

If the SMC is programmed with NRD/NWE pulse length equal to 1 clock cycle, ECC can't compute the parity.

Problem Fix/Workaround

It is recommended to program SMC with a value superior to 1.

ECC: Uncomplete parity status when error in ECC parity

When a single correctable error is detected in ECC value, the error is located in ECC Parity register's field which

contains a 1 in the 24 least significant bits, except when the error is located in the 12th or the 24th bit. In this case,

these bits are always stuck at 0.

A Single correctable error is detected but it is impossible to correct it.

Problem Fix/Workaround

ECC: Unsupported ECC per 512 words

1 bit ECC per 512 words is not functional.

Problem Fix/Workaround

Perform the ECC computation by software.

ECC: Unsupported hardware ECC on 16-bit Nand Flash

Hardware ECC on 16-bit Nand Flash is not supported.

Problem Fix/Workaround

Perform the ECC by software.

相關(guān)PDF資料	PDF描述
MD80C52XXX-25SC	8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40
MQ83C154DTXXX-25/883R	8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44
MQ80C52TXXX-12SB	8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44
MC80C52CXXX-16	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
MR80C52EXXX-25/883	8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MQ82370-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
MQ8238020	制造商:Intel 功能描述:CONTROLLER: OTHER
MQ82380-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
MQ82380-20/R	制造商:Rochester Electronics LLC 功能描述:
MQ82592	制造商:Rochester Electronics LLC 功能描述:- Bulk

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