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4–14 Chapter 4: Functional Description

Avalon Streaming Interface

FIR Compiler User Guide © May 2011 Altera Corporation

The Avalon Interface Specifications define many signal types many of which are

optional. Table 4–2 lists the signal types used by the Avalon-ST interfaces for the FIR

Compiler MegaCore function. Any signal type not explicitly listed in the table is not

included.

f For a full description of the Avalon-ST interface protocol, refer to the Avalon Interface

Specifications.

Avalon-ST Data Transfer Timing

Figure 4–11 shows the Avalon-ST interface signals.

Table 4–1. Avalon-ST Interface Parameters

Parameter Name Value

READY_LATENCY 0

BITS_PER_SYMBOL data width

SYMBOLS_PER_BEAT

SYMBOL_TYPE signed/unsigned

ERROR_DESCRIPTION 00: No error

01: Missing startofpacket (SOP)

10: Missing endofpacket (EOP)

11: Unexpected EOP or any other error

Table 4–2. Avalon-ST Interface Signal Types

Signal Type Width Direction

ready 1 Sink to Source

valid 1 Source to Sink

data data width Source to Sink

channel log

(number of channels) Source to Sink

error 2 Source to Sink

startofpacket 1 Source to Sink

endofpacket 1 Source to Sink

Figure 4–11. Avalon-ST Interface

Data Source Data Sink

valid

data

error

ready

channel

startofpacket

endofpacket

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 75 76

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