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C P U. C P U. C P U. C P U. L2 Trigger. L3 Trigger. Event Builder. IF. L2 Buffer => Event Builder. L2 Buffer Board. Request. Replies. Token Pull Protocol. 1. Upon an event passing L2 trigger, Event Builder sends an event build message
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C P U C P U C P U C P U ... . . . . L2 Trigger L3 Trigger Event Builder IF L2 Buffer => Event Builder L2 Buffer Board Request ... Replies Token Pull Protocol 1. Upon an event passing L2 trigger, Event Builder sends an event build message (token) to the first CPU of all L2 Buffer boards. 2. The process packs associated pieces of data and sends back to Event Builder, and then forwards the token to the next CPU, and up to the last one. 3. For each L2 Buffer board, one request will have up to 6 replies. Fang Sun, 22/2/2000