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Rabbit 6000 User’s Manual
digi.com
368
33. F
LEXIBLE
I
NTERFACE
M
ODULES
33.1 Overview
The Rabbit 6000 contains two Flexible Interface Modules, or FIMs. These modules are essentially small
independent microcontrollers that can be used to provide a wide range of customized peripherals, such as
CAN, SD card, or 1-Wire serial.
Each Flexible Interface Module can run at up to 400 MHz and includes 1024x14 bits of program memory
and 256x8 bits of data memory. Most Flexible Interface Module applications are expected to use a single
parallel port, so bit-by-bit selection of Flexible Interface Module functionality is available on Parallel Ports
F and G. Other Rabbit parallel ports can be accessed to a limited extent using port override modes avail-
able on the Flexible Interface Module. If the override is enabled, the entire parallel port is then controlled
by the FIM.
Communication between the Rabbit 6000 and the Flexible Interface Modules is realized in several ways.
•
16-byte TX FIFO from the Rabbit to the Flexible Interface Module
•
16-byte RX FIFO from the Flexible Interface Module to the Rabbit
•
16-byte RX status FIFO from the Flexible Interface Module to the Rabbit that can be used to signal end
of packet or an error condition
•
16 “control byte” registers that can be written by the Rabbit and read by the Flexible Interface Module
•
16 “expansion port” registers that can be written by the Flexible Interface Module and read by the Rab-
bit
•
The Rabbit provides an interrupt request line to the Flexible Interface Module
•
The Flexible Interface Module provides an interrupt request line to the Rabbit
The FIFOs are DMA-aware.
The interface between the Flexible Interface Modules and the Rabbit 6000 is described in this chapter.
Customers wishing to incorporate a custom Flexible Interface Module application in their own design
should contact their sales representative at Digi International for more information.
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