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The MAC ASIC
page -6 OmniSwitch Troubleshooting Guide September 2005
The Coronado ASIC contains both Ingress and Egress functions. Ethernet frames flow from the Catalina
through the Ingress Coronado, through the Nantucket switch fabric, then through the Coronado Egress
logic and finally out the Egress Catalina.
Note: Frames always flow through the Nantucket, even if the input and output ports are on the same Coro-
nado ASIC. One or more Coronado ASIC are located on the network interface cards. It is a store and
forward technology meaning that the entire PDU must be received before it is transferred across the fabric
to the egress port. Each Coronado provides 2.4Gbps interface to the backplane.
Coronado has a build-in Hardware Routing Engine known as HRE. This HRE provides the function of
Layer 2 switching as well as Layer 3 routing. Coronado also has classifier logic built-in, which enables the
packet to be classified according to the policies defined.
On the Network Interface cards for OmniSwitch 7XXX, there is one Coronado per NI.
Ethernet switching modules (10/100MB) always have one Coronado for both OmniSwitch 7/8XXX.
OmniSwitch 8800 has four Coronado ASICs (0 t0 3) per NI for all the GNI modules
Coronado is referred to as a Slice. Therefore, the Coronado on a network interface card in a working chas-
sis is referred to by slot and slice number.
Functional Description
HRE
X
Y
B
U
S
_
R
X
Queue
Manager
X
Y
B
U
S
_
T
X
Egress Logic
SPARC
F
B
U
S
_
R
X
F
A
B
R
I
C
SSRAM SDRAM0 SDRAM1
C
a
t
a
l
i
n
a
0
C
A
t
a
l
i
n
a
1
F
B
U
S
_
T
X
BBUS