Altera Arria V Avalon-ST - Manual (Page 25)

Parameter Value Description
Application
Interface
Avalon-ST 64-bit
Avalon-ST 128-bit
Specifies the width of the Avalon-ST interface between the
Application and Transaction Layers. The following widths are
required:
Data Rate Link Width Interface Width
Gen1
×1 64 bits
×2 64 bits
×4 64 bits
×8 128 bits
Gen2
×1 64 bits
×2 64 bits
×4 128 bits
RX Buffer credit
allocation -
performance for
received requests
Minimum
Low
Balanced
High
Maximum
Determines the allocation of posted header credits, posted
data credits, non-posted header credits, completion header
credits, and completion data credits in the 16 KByte RX buffer.
The 5 settings allow you to adjust the credit allocation to
optimize your system. The credit allocation for the selected
setting displays in the message pane.
Refer to the Throughput Optimization chapter for more
information about optimizing performance. The Flow Control
chapter explains how the RX credit allocation and the
Maximum payload RX Buffer credit allocation and the
Maximum payload size that you choose affect the allocation
of flow control credits. You can set the Maximum payload
size parameter on the Device tab.
The Message window of the GUI dynamically updates the
number of credits for Posted, Non-Posted Headers and Data,
and Completion Headers and Data as you change this
selection.
3-2 Avalon-ST System Settings
2014.12.15
Altera Corporation Parameter Settings
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