参数资料
| 型号： | 101-0558 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 33/94页 |
| 文件大小： | 0K |
| 描述： | COMPUTER SNG BD BL1800 512K SRAM |
| 标准包装： | 10 |
| 系列： | SBC |
| 模块/板类型： | 单板计算机模块 |
| 适用于相关产品： | BL1800 |
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User’s Manual
35
3.8.3 Spectrum Spreader
Jackrabbit boards that carry the CE mark have a Rabbit 2000 microprocessor that features a
spectrum spreader, which helps to mitigate EMI problems. By default, the spectrum
spreader is on automatically for Jackrabbit BL1810 and BL1820 boards that carry the CE
mark when used with Dynamic C 7.32 or later versions, but the spectrum spreader may also
be turned off or set to a stronger setting. The spectrum spreader settings may be changed
through a simple configuration macro as shown below.
The spectrum spreader is off by default for Jackrabbit BL1800 models, and needs to be
enabled for them to be CE-compliant. To allow the flash memory and RAM chips to
accommodate the occasional higher frequencies associated with the spectrum spreader
being turned on for the Jackrabbit BL1800 models only, you will need at least one wait
state for both the flash memory and the RAM. The strong spectrum-spreading setting is not
needed for any Jackrabbit board.
The number of wait states is specified in the following code from the LIB\BOARDTYPES
library. (There are 0 wait states by default.)
#ifndef NUM_RAM_WAITST
#define NUM_RAM_WAITST 0
#endif
#ifndef NUM_FLASH_WAITST
#define NUM_FLASH_WAITST 0
#endif
There is no spectrum spreader functionality for Jackrabbit boards that do not carry the CE
mark or when using any Jackrabbit with a version of Dynamic C prior to 7.30.
1. Select the “Defines” tab from the Dynamic C Options > Project Options menu.
2. Normal spreading is the default, and usually no entry is needed. If you need to specify
normal spreading, add the line
ENABLE_SPREADER=1
For strong spreading, add the line
ENABLE_SPREADER=2
To disable the spectrum spreader, add the line
ENABLE_SPREADER=0
NOTE: The strong spectrum-spreading setting is not recommended since it may limit
the maximum clock speed or the maximum baud rate. It is unlikely that the strong set-
ting will be used in a real application.
3. Click OK to save the macro. The spectrum spreader will now remain off whenever you
are in the project file where you defined the macro.
相关PDF资料 |
PDF描述 |
|---|---|
| 396-036-526-204 | CARD EDGE 36POS DL .125X.250 BLK |
| 396-036-526-202 | CARD EDGE 36POS DL .125X.250 BLK |
| 101-0411 | INTERFACE 12KEYDISP ETHNT OP6700 |
| AT24C02A-10PI-2.7 | IC EEPROM 2KBIT 400KHZ 8DIP |
| AT24C02A-10PI-1.8 | IC EEPROM 2KBIT 400KHZ 8DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 10105584 | 制造商:Amphenol Corporation 功能描述:10-341374-222 - Bulk |
| 101055OO | 制造商:TE Connectivity 功能描述: |
| 101056084S | 制造商:Amphenol Aerospace 功能描述:CONNECTOR |
| 101-0561 | 功能描述:模块化系统 - SOM RCM3400 RABBITCORE RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| 10-105610-02S | 制造商:Amphenol Aerospace 功能描述:PLUG |
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