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Chapter 18: Interfaces Library
Table 18–10. Avalon-ST Packet Format Converter Block Parameters
18–13
Name
Multi-Packet Mapping
Symbol Width
Use Asynchronous Clear
Port
Sink Format X
Sink X Symbols Per Beat
Source Format Y
Value
On or Off
>= 1
On or Off
string
1–32
string
Description
When off, one input packet is matched to one output packet and the input and
output packets must have the name number of instances in each field. When on,
the PFC maps the input packets to output packets such that all instances of every
data field are accounted for.
Specifies the number of bits per symbol that all the PFC sink and source
interfaces use.
Turn on to use the asynchronous clear input ( aclr ).
A quoted string or MATLAB variable that describes the packet format for sink
interface X.
Specifies the number of symbols per beat for sink interface X .
A quoted string or MATLAB variable that describes the packet format for source
interface Y.
Source Y Symbols Per Beat 1–32
Specifies number of symbols per beat for source interface Y .
PFC Data Flow
The PFC spools data into a FIFO-like memory as it arrives, and spools it out in a
different order as it leaves. DSP Builder can provide the data at the output of each
interface as soon as it writes it into the memory and all previous output data is
transferred. When the PFC has multiple output interfaces, the startofpacket signal
for all the interfaces is asserted at the same time.
The PFC stops data input on input interfaces by deasserting the ready signal
whenever there is a risk of overwriting data that it has not yet output. If a
downstream block pauses output data by deasserting the ready signal to the PFC, the
PFC accepts data until it risk overwriting unsent data. At this point, the PFC deasserts
the ready signals on its own input interface, causing the upstream block to stop
sending data.
In a similar way, if the upstream block starves the PFC of data by deasserting the
valid signals to the PFC, then the PFC output interface continues to send data until
the memory drains. It then stops sending data by deasserting the output valid
signals.
For multiple interface PFC blocks, back pressuring an output interface or starving an
input interface affects all other interfaces. When an output interface is back pressured,
the input interfaces are back pressured, causing the other outputs to be starved of
data. Likewise, if an input interface is starved of data, the output interfaces eventually
stop, causing the other input interfaces to be back pressured.
Packet Format Description
For each input and output interface, the number of symbols per beat and the packet
description describe the basic format of the packet.
The number of symbols per beat defines, for each interface, the number of symbols
that present in parallel on every active cycle. The packet description is a string that
describes the fields in the packet.
November 2013
Altera Corporation
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
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