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Nantucket ASIC
OmniSwitch Troubleshooting Guide September 2005 page -17
Nantucket ASIC
The Nantucket ASICs have the following:
•Support for 8 and 16 Coronados only.
•No dynamic queue numbering for each NI slot.
•Fixed eight Nantuckets per Fabric board.
•Maximum of one redundant Fabric board.
The Nantucket software is arranged as:
•Nantucket operational software resides on the CMM.
•Nantucket operational software runs on the UltraSPARC IIe on the CMM.
•All accesses to Nantucket registers is through the PCI bridge and over the Bbus bridges.
•Minimum user interface software is provided for configuring and statusing the Nantucket ASICs.
•Minimum SNMP software is provided for configuring and statusing the Nantucket ASICs.
Additional Nantucket Specifications
•Nantucket Fabric consists of eight Nantucket ASICs for the primary Fabric in OS-7800 and four
Nantucket ASICs for the primary Fabric in OS-7700.
•Nantucket Fabric consists of eight/four Nantucket ASICs for the redundant Fabric, when running with
a redundant CMM.
•Nantucket uses six SRAM memories, each SRAM is 32 bits wide by 11264 words deep.
•Nantucket has a point to point interface to all Coronados running at 500MHz.
•No packet processing on Nantucket
•Provides very little buffering
•Supports 512 per-port queues
•Supports 1 per-Coronado broadcast queue and 1 intercommunication queue.
•Supports flow control/pay generation for Coronado bandwidth control
•Supports VLAN spanning tree masks
Nantucket supports the following messages:
•Ingress packets w/header
•Egress packets w/header
•Flow control messages
•Bandwidth management control messages “pay.”