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Chapter 18: Interfaces Library
A single input or output interface can have multiple instances of the same field. For
example, Red,Green,Red,Blue represents a packet with two red symbols per packet.
The PFC matches the nth instance of a field on an input interface to the nth instance of
the same field on an output interface. If an output interface has Blue,Green,Red,Red ,
the data for the first Red field is taken from the first Red field in the input packet.
Each output interface may or may not use a given input field, but unless you set the
Multi-Packet Mapping option (and if the input field is used) there must be the same
number of instances of the field in each output as there is in the input. For example,
Green and Red,Red,Green are both valid, but Red,Green is not.
Multi-Packet Mapping
Set the Multi-Packet Mapping option, so that the PFC is not limited to mapping a
single input packet on each port to a single output packet on each port. It can map
multiple input packets to multiple output packets.
For example, (Red,Green,Blue)2 maps to (Red,Green,Blue)3 by using three input
packets for every two output packets.
The ratio of input fields to output fields must be constant.
For example, Red,Red,Green,Blue does not map to (Red,Green,Blue)2 because each
output packet requires one input packet for Red , but two input packets for Green and
Blue .
DSP Builder supports multiple interfaces but the packet ratio must be constant across
all {input interface, output interface} pairs.
For example, two input interfaces with the formats (Red,Green)2 and Blue map to
output interface (Red)6,Blue(3),Green(6) because three input packets are required
for two output packets for all input and output pairs. The same inputs do not map to
(Red)3,Blue(3),Green(3) , because to make two output packets, three of the first
input's packets and six of the second input's packets are required.
DSP Builder does not support packets of unknown length.
Error Handling
The PFC contains internal counters that keep track of the current position in the
packet for each input and uses these counters to detect frame delineation errors. Every
time a startofpacket or endofpacket signal asserts on an input interface, the PFC
uses its knowledge of the frame structure to ensure that the assertion is on a valid
cycle. For PFC variants where the packet size is known, the PFC also checks that the
startofpacket and endofpacket signals assert when they should do, and are not
missed.
The PFC only has a single output error bit to report frame delineation errors. The
output error bit asserts on all outputs as soon as DSP Builder detects an error, and it
asserts for each output interface independently until an endofpacket asserts for that
output interface.
After the endofpacket asserts, the PFC presents no more data to that output interface.
When all output interfaces stop, the PFC resets and resumes normal operation. The
PFC stops independently on the endofpacket signal for each output, and components
downstream of the PFC should never see partial frames.
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
November 2013 Altera Corporation
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