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7–22
Chapter 7: Using the Interfaces Library
Avalon-ST Interface
Figure 7–14 shows an example of a generic function that has two input interfaces and
performs a transformation on the two input streams.
Figure 7–14. Generic Function
Avalon-ST Packet Format Converter
The packet format converter (PFC) is a flexible, multipurpose component that
transforms packets that are received from one function into a packet format that is
supported by another function.
The PFC takes packet data from one or more input interfaces, and provides field
reassignment in time and space to one or more output packet interfaces. You can
specify the input packet format and the desired output packet format. The
appropriate control logic is automatically generated.
Each input interface has Avalon-ST ready , valid , startofpacket , endofpacket , empty ,
and data signals. Each output interface has an additional error bit, which asserts to
indicate a frame delineation error.
The PFC performs data mapping on a packet by packet basis, so that there is exactly
one input packet on each input interface for each output packet on each output
interface. The interface limits the packet rate of the converter with the longest packet.
When the PFC has multiple output interfaces, DSP Builder aligns the packets on each
output interface so that the startofpacket signal presents on the same clock cycle.
If each interface supports fixed-length packets, you can select the multipacket
mapping option, and the PFC can map fields from multiple input packets to multiple
output packets.
f For a complete description of the Avalon-ST interface, refer to the Avalon Interface
Specifications . For an example of a design that uses Avalon-ST interfaces and the
Packet Format Converter blocks, refer to AN442: Tool Flow for Design of Digital IF for
Wireless Systems .
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
November 2013 Altera Corporation
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