5.1. Multi-Port Front End (MPFE)
The fabric interface provides communication between the Avalon-ST-like internal protocol of the hard memory interface and the external Avalon-MM protocol. The fabric interface supports frequencies in the range of 10 MHz to one-half of the memory interface frequency. For example, for an interface running at 533 MHz, the maximum user logic frequency is 267 MHz. The MPFE handles the clock crossing between user logic and the hard memory interface.
The multi-port front end read and write FIFO depths are 8, and the command FIFO depth is 4. The FIFO depths are not configurable.
Requests arriving at a given port are executed in the order in which they are received.
Requests arriving at different ports have no guaranteed order of service, except when a first transaction has completed before the second arrives.
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