AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE Guía de usuario Pagina 113

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Chapter 7: IP Core Interfaces 7–15
Cyclone V Hard IP for PCI Express
December 2013 Altera Corporation Cyclone V Hard IP for PCI Express
User Guide
Figure 7–16 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
.
Figure 7–17 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.
f For a complete description of the TLP packet header formats, refer to Appendix A,
Transaction Layer Packet (TLP) Header Formats.
Figure 7–16. 128-Bit Avalon-ST Interface Back-to-Back Receive TLPs
coreclkout
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 7–17. 128-Bit Packet Example Use of rx_st_empty and Single-Cycle Packet
coreclkout
rx_st_data[127:0]
rx_st_sop
rx_st_eop
rx_st_empty
rx_st_ready
rx_st_valid
0000090
.
1C0020000F00000001000044329CF300 1C0020000F45612CCFA2003451009...
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