Altera FIR Compiler - Manual (Page 56)

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 1
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
2
(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