Altera Arria V Avalon-ST - Manual (Page 50)

Figure 4-12: 128-Bit Avalon-ST Interface Back-to-Back Transmission
The following figure illustrates back-to-back transmission on the 128-bit Avalon-ST RX interface with no
idle cycles between the assertion of
rx_st_eop
and
rx_st_sop
.
pld_clk
rx_st_data[127:0]
rx_st_sop
rx_st_eop
rx_st_empty
rx_st_ready
rx_st_valid
rx_st_err
BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... BB ... ... BB
Figure 4-13: 128-Bit Packet Examples of rx_st_empty and Single-Cycle Packet
The following figure illustrates a two-cycle packet with valid data in the lower qword
(
rx_st_data[63:0]
) and a one-cycle packet where the
rx_st_sop
and
rx_st_eop
occur in the same
cycle.
pld_clk
rx_st_data[127:0]
rx_st_sop
rx_st_eop
rx_st_empty
rx_st_ready
rx_st_valid
0000090 1C0020000F0000000100004 450AC89000012FE0D10004
For a complete description of the TLP packet header formats, refer to Appendix A, Transaction Layer
Packet (TLP) Header Formats.
Avalon-ST TX Interface
The following table describes the signals that comprise the Avalon-ST TX Datapath. The TX data signal
can be 64 or 128.
2014.12.15
Avalon-ST TX Interface 4-13
Interfaces and Signal Descriptions Altera Corporation
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