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Avalon‑ST RX Interface

The following table describes the signals that comprise the Avalon-ST RX Datapath. The RX data signal

can be 64, 128, or 256 bits.

Table 5-1: 64-, 128-, or 256‑Bit Avalon-ST RX Datapath

Signal Direction Description

rx_st_data[<n>-1:0]

Output Receive data bus. Refer to figures following this table for the

mapping of the Transaction Layer’s TLP information to rx_st_

data and examples of the timing of this interface. Note that the

position of the first payload dword depends on whether the TLP

address is qword aligned. The mapping of message TLPs is the

same as the mapping of TLPs with 4-dword headers. When using

a 64-bit Avalon-ST bus, the width of rx_st_data is 64. When

using a 128-bit Avalon-ST bus, the width of rx_st_data is 128.

When using a 256-bit Avalon-ST bus, the width of rx_st_data is

256 bits.

rx_st_sop[<n>-1:0]

Output Indicates that this is the first cycle of the TLP when rx_st_valid

is asserted. When using a 256-bit Avalon-ST bus the following

correspondences apply:

When you turn on Enable multiple packets per cycle,

• bit 0 indicates that a TLP begins in rx_st_data[127:0]

• bit 1 indicates that a TLP begins in rx_st_data[255:128]

In single packet per cycle mode, this signal is a single bit which

indicates that a TLP begins in this cycle.

rx_st_eop[<n>-1:0] Output Indicates that this is the last cycle of the TLP when rx_st_valid

is asserted.

When using a 256-bit Avalon-ST bus the following correspond‐

ences apply:

When you turn on Enable multiple packets per cycle,

• bit 0 indicates that a TLP ends in rx_st_data[127:0]

• bit 1 indicates that a TLP ends in rx_st_data[255:128]

In single packet per cycle mode, this signal is a single bit which

indicates that a TLP ends in this cycle.

rx_st_empty[1:0]

Output Indicates the number of empty qwords in rx_st_data. Not used

when rx_st_data is 64 bits. Valid only when rx_st_eop is

asserted in 128-bit and 256-bit modes.

5-2

Avalon‑ST RX Interface

UG-01097_avst

2014.12.15

Altera Corporation

Interfaces and Signal Descriptions

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