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The MAC ASIC
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OmniSwitch Troubleshooting Guide
September 2005
The MAC ASIC
There are two different types of MAC layer ASICs:
• Catalina
• Firenze
Catalina
The Catalina basically provides three functions: Media Access Control (MAC) Layer functions, data buff-
ering, and statistics accumulation and storage for each port.
ering, and statistics accumulation and storage for each port.
The Catalina provides the interface between Ethernet analog devices (10/100 Mbps and 1000 Mbps) and
the Coronado. The Catalina has a total of thirteen network interfaces, twelve of which support 10/100
Mbps Ethernet through a RMII (Reduced Media Independent Interface) and the thirteenth supports 1000
Mbps. All Catalina ASIC buffer memory is dedicated to providing a smooth stream of data inbound from
the Ethernet ports to the Coronado or outbound from the Coronado to the Ethernet ports.
the Coronado. The Catalina has a total of thirteen network interfaces, twelve of which support 10/100
Mbps Ethernet through a RMII (Reduced Media Independent Interface) and the thirteenth supports 1000
Mbps. All Catalina ASIC buffer memory is dedicated to providing a smooth stream of data inbound from
the Ethernet ports to the Coronado or outbound from the Coronado to the Ethernet ports.
The Catalina does not contain system-level buffering for storing frames for later transmission. The Coro-
nado Queue Manager provides this function. Catalina packet processing is limited to physical-layer
processing. It does not perform any protocol processing or frame recognition. The Coronado handles these
functions. One or two Catalina ASIC is located on any network interface.
nado Queue Manager provides this function. Catalina packet processing is limited to physical-layer
processing. It does not perform any protocol processing or frame recognition. The Coronado handles these
functions. One or two Catalina ASIC is located on any network interface.
Coronado
Catalina 0
Catalina 1
...
...
12 10/100 ports
12 10/100 ports
XY-BUS
F-BUS
ENI-C-24
OS-7/8XXX
OS-7/8XXX