Specifications

Table Of Contents
MAINTENANCE
Page 120 MRC-565 Packet Data Radio Operations & Maintenance
12-bit 16 channel A/D converter
Power fail detection circuitry
Solid State Relay outputs, quantity 2
Optically isolated digital inputs, quantity 4
Digital outputs, quantity 5 (0 to +5V)
Onboard temperature sensor (from PA board)
6.2.2 Cold Fire Processor
The MRC-565 microprocessor design is centered around the Motorola MC54455 Coldfire
embedded controller. The MCF54455 is an advanced 32 bit processor based on the Version 4
Coldfire architecture. It contains a 32 Kbyte internal RAM, a USB On-the-Go Controller, DDR
SDRAM Controller, a 16-channel DMA Controller, a DSPI controller, three UARTS, I2C
Controller, Ethernet Controller and Flex Bus Controller for interfacing to external GPIO devices,
Flash Memory Devices, and to the DSP Processor.
For detailed information on the CPU operation, refer to the MCF54455 User's Manual.
6.2.2.1 Memory
The MRC-565 microprocessor contains 128 Mbits of FLASH program memory (organized as 8
Meg of 16 bit words, 128Mbits of FLASH data configuration memory (organized as 8 Meg of 16
bit words), and 256 Mbits of low power dynamic RAM memory (organized as 16 Meg of 16 bit
words).
New releases of operating code can be can be down loaded through the RS-232 ports (user on
site ) or remote down loading can be achieved via the Transmit and Receive hardware and
another modem ( user off site ).
6.2.3 Data Input/Output
Three DCE RS-232 ports, one SDI-12 Port, 6 Analog to Digital converter channels, 2 Solid State
1/2 amp relays and 4 optically isolated inputs are available through one high density D-44 pin
connector. A 4 lead adapter cable is used to break out the RS-232 ports and additional I/O into
three DB-9 pin connectors and one DB-25 connectors. The three DCE RS-232 ports are labeled
OPER, AUX, and DATA. The OPER port is intended for control terminals and carries only the
necessary 3-wire RS-232 signals. The AUX port carries the 3-wire RS-232 signals. The DATA
port contains the 3-wire RS-232 communications and basic handshake and modem lines
(RTS,CTS,DTR,DSR,RING) defined in the RS-232 standard. Internal Jumpers (J3 & J4) are
available allow one to select Port 1 or Port 2 to connect GNSS Daughter board to Codefire
processor. When this is done, Port1 or Port 2 won’t be available externally.