RCM3365 datasheet(39/165 Pages) ETC2

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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/0 write (/IOWR) and I/0 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 RCM3365/

RCM3375.

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 external I/O bus

4.1.2 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.

/RES is an output from the reset circuitry that can be used to reset external peripheral

devices.

4.1.3 LEDs

The RCM3365/RCM3375 has five status LEDs located beside the RJ-45 Ethernet jack:

ACT

, LINK, SPEED, FM, and USR.

The yellow ACT LED at DS1 indicates network activity.

The green LINK LED at DS2 indicates that the RCM3365/RCM3375 is connected to a

working network.

The green SPEED LED at DS4 is on to indicate when the RCM3365/RCM3375 is con-

nected to a 100Base-T Ethernet connection.

The FM LED at DS3 blinks when data are being written to or read from the flash mass-

storage device.

The red USR LED at DS3 is a user-programmable LED, which is controlled by PD0 on

the Rabbit 3000’s Parallel Port D. The sample program FLASHLED.C provided in the

Dynamic C SAMPLES\RCM3360 folder shows how to set up and use this user-

programmable LED.

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