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RabbitCore RCM3900 User’s Manual

4.1.1 Memory I/O Interface

The Rabbit 3000 address lines (A0–A18) and all the data lines (D0–D7) are routed

internally to the onboard flash memory and SRAM chips. I/O write (/IOWR) and I/O read

(/IORD) are available for interfacing to external devices—pay attention to the loading on

these two signals if you use them since these signals are also used by the RCM3900.

Parallel Port A can also be used as an external I/O data bus to isolate external I/O from the

main data bus. Parallel Port B pins PB2–PB7 can also be used as an auxiliary address bus.

When using the external I/O bus for a digital output or the LCD/keypad module on the

Prototyping Board, or for any other reason, you must add the following line at the begin-

ning of your program.

#define PORTA_AUX_IO

// required to enable auxiliary I/O bus

4.1.2 LEDs

The RCM3900 has three Ethernet status LEDs located beside the RJ-45 Ethernet jack—

these are discussed in Section 4.2.2.

Additionally, there is one dual LED DS4. PD1 on the Rabbit 3000’s Parallel Port D is used

to enable the NAND flash on the RCM3900 model, but is connected to the green CE LED

at DS4, which is not used. The red BSY LED at DS4 is a user-programmable LED, and is

controlled by PD0. The CONTROLLEDS.C and FLASHLEDS.C sample programs in the

Dynamic C SAMPLES\RCM3900 folder show how to set up and use this user-

programmable LED.

4.1.3 Other Inputs and Outputs

The status, /RESET_IN, SMODE0, and SMODE1 I/O are normally associated with the

programming port. Since the status pin is not used by the system once a program has been

downloaded and is running, the status pin can then be used as a general-purpose CMOS

output. The programming port is described in more detail in Section 4.2.3.

/RESET_IN is an external input used to reset the Rabbit 3000 microprocessor and the

RCM3900 onboard peripheral circuits. /RES is an output from the reset circuitry that can

be used to reset external peripheral devices.

相关代理商/技术参数	参数描述
20-101-1198	功能描述:程序设计器配件 Programmers, Development Systems Accessories - CARD EXPANSION RN1400 ROHS RoHS:否制造商:Lattice 产品:ispDOWNLOAD Cables 用于:In-system Programming
20-101-1200	功能描述:子卡和OEM板 UNIVERSAL RELAY EXP BOARD RoHS:否制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
20-101-1201	功能描述:程序设计器配件 USB PROG CBL WITH 2MM CONN RoHS:否制造商:Lattice 产品:ispDOWNLOAD Cables 用于:In-system Programming
20-101-1202	功能描述:WiFi/802.11模块 RCM4400W CORE MODULE Wi-Fi/802.11 RoHS:否制造商:Taiyo Yuden 支持协议:802.11 b/g/n 频带: 数据速率:150 Mbps 接口类型:SDIO 传输功率（最大）: 天线连接器类型: 工作电源电压:3.4 V to 5.5 V 传输供电电流: 接收供电电流: 最大工作温度:+ 80 C 尺寸:35 mm x 15 mm x 2.9 mm
20-101-1207	功能描述:Zigbee/802.15.4模块 RF/IF and RFID RF Evaluation & Development Kits & Boards - RCM4510W FCC CERTIFIED RoHS:否制造商:Digi International 频带:902 MHz to 928 MHz 视线范围: 数据速率: 灵敏度: 工作电源电压:2.4 V to 3.6 V 传输供电电流:215 mA 接收供电电流:26 mA 输出功率:250 mW 天线连接器类型:Wire 最大工作温度:+ 85 C 尺寸:32.94 mm x 22 mm x 2.03 mm

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