參數(shù)資料
型號(hào)： 20-101-1094
廠商： Rabbit Semiconductor
文件頁數(shù)： 77/130頁
文件大?。?/td> 0K
描述： MCU RCM4000 RABBITCORE
標(biāo)準(zhǔn)包裝： 1
系列： RabbitCore®
模塊/板類型： MPU 核心模塊
適用于相關(guān)產(chǎn)品： RCM4000
產(chǎn)品目錄頁面： 619 (CN2011-ZH PDF)
其它名稱： 316-1139
44
RabbitCore RCM4000
4.6 Memory
4.6.1 SRAM
RCM4000 modules have 512K of data SRAM installed at U16.
4.6.2 Flash EPROM
All RCM4000 modules also have 512K of flash EPROM installed at U3.
NOTE: Rabbit recommends that any customer applications should not be constrained by
the sector size of the flash EPROM since it may be necessary to change the sector size
in the future.
Writing to arbitrary flash memory addresses at run time is discouraged. Instead, define a
“user block” area to store persistent data. The functions writeUserBlock and
readUserBlock
are provided for this. Refer to the Rabbit 4000 Microprocessor
Designer’s Handbook
for additional information.
4.6.3 NAND Flash
The RCM4000 model has a NAND flash to store data and Web pages. The NAND flash is
particularly suitable for mass-storage applications, but is generally unsuitable for direct
program execution. The NAND flash differs from parallel NOR flash (the type of flash
memory used to store program code on Rabbit-based boards and RabbitCore modules
currently in production) in two respects. First, the NAND flash requires error-correcting
code (ECC) for reliability. Although NAND flash manufacturers do guarantee that block 0
will be error-free, most manufacturers guarantee that a new NAND flash chip will be
shipped with a relatively small percentage of errors, and will not develop more than some
maximum number or percentage of errors over its rated lifetime of up to 100,000 writes.
Second, the standard NAND flash addressing method multiplexes commands, data, and
addresses on the same I/O pins, while requiring that certain control lines must be held sta-
ble for the duration of the NAND flash access. The software function calls provided by
Rabbit for the NAND flash take care of the data-integrity and reliability attributes.
Sample programs in the SAMPLES\RCM4000\NANDFlash folder illustrate the use of
the NAND flash. These sample programs are described in Section 3.2.1, “Use of NAND
相關(guān)PDF資料
PDF描述
345-030-540-802 CONN CARDEDGE 30POS .100 X .200
305-030-500-202 CONN CARDEDGE 30POS .156 X .140
243-002-542-101 MINI CARD EDGE 0.2" - 2PIN 1ROW
20-101-1217 MODULE RABBITCORE RCM3229
20-101-0494 MODULE RABBITCORE RCM2250
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
20-101-1095 功能描述:模塊化系統(tǒng) - SOM BL2600 XD HOT SWAP 10/100 RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
20-101-1104 功能描述:處理器配件 USB xd reader RoHS:否 制造商:Olimex Ltd. 產(chǎn)品:Cable 用于:
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20-101-1110 功能描述:界面開發(fā)工具 Rio Protyping Board RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
20-101-1112 功能描述:模塊化系統(tǒng) - SOM RCM4010 Core Module RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
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