AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE Guía de usuario Pagina 119

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Chapter 7: IP Core Interfaces 7–21
Cyclone V Hard IP for PCI Express
December 2013 Altera Corporation Cyclone V Hard IP for PCI Express
User Guide
Data Alignment and Timing for the 128-Bit Avalon-ST TX Interface
Figure 7–23 shows the mapping of 128-bit Avalon-ST TX packets to PCI Express TLPs
for a three dword header with qword aligned addresses.
Figure 7–24 shows the mapping of 128-bit Avalon-ST TX packets to PCI Express TLPs
for a 3 dword header with non-qword aligned addresses. It also shows
tx_st_err
assertion.
Figure 7–23. 128-Bit Avalon-ST tx_st_data Cycle Definition for 3-Dword Header TLP with Qword Aligned Address
Data3
Header2 Data 2
Header1 Data1 Data(n)
Header0 Data0 Data(n-1)
coreclkout
tx_st_valid
tx_st_data[127:96]
tx_st_data[95:64]
tx_st_data[63:32]
tx_st_data[31:0]
tx_st_sop
tx_st_eop
tx_st_empty
Figure 7–24. 128-Bit Avalon-ST tx_st_data Cycle Definition for 3-Dword Header TLP with non-Qword Aligned Address
coreclkout
tx_st_valid
tx_st_data[127:96]
tx_st_data[95:64]
tx_st_data[63:32]
tx_st_data[31:0]
tx_st_sop
tx_st_err
tx_st_eop
tx_st_empty
Data0 Data 4
Header 2
Data 3
Header 1 Data 2
Data (n)
Header 0 Data 1
Data (n-1)
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