Motorola PPC/CPCI-690, Reference Manual

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System Controller Buses
5 - 4 PPC/CPCI-690
System Controller
The Discovery system controller is a single chip solution for PowerPC
based systems. The chip has a five bus architecture with:
• 64-bit / 133 MHz interface to CPU
• 64-bit and 8bit for ECC / 133 MHz interface to SDRAM
• Two 64-bit / 66 MHz PCI interfaces
• 32-bit interface to devices
Ethernet Ports
The system controller contains three 10Base-T/100Base-T Ethernet control-
lers which are able to operate in either full duplex or half-duplex mode.
Ethernet port 1 is routed to a standard RJ-45 connector at the front panel.
Ethernet ports 2 and 3 are routed to connector J3. On the standard variants
the magnetics for port 2 and 3 are implemented on the RTB.
On the front-panel, a green LED is available which indicates an Ethernet
link. For further information on Ethernet LEDs, refer to “LEDs” page 3-6.
Serial Ports
The system controller includes two multi-protocol serial controllers
(MPSC) which are configured for Universal Asynchronous Receiver-Trans-
mitter (UART) mode. The controller can operate simultaneously and have
dedicated serial direct memory access (SDMA) engines to transfer data
between port and memory. Receive and transmit clock are generated by the
internal baud rate generator.
The UART ports are connected with two RS232 connectors at the front-
panel and two on the RTB.
Note: The serial port can only be used either via front panel or via RTB,
but not simultaneously.