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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.”