7–22 Chapter 7: IP Core Interfaces
Cyclone V Hard IP for PCI Express
Cyclone V Hard IP for PCI Express December 2013 Altera Corporation
User Guide
Figure 7–25 shows the mapping of 128-bit Avalon-ST TX packets to PCI Express TLPs
for a four dword header TLP with qword aligned data.
Figure 7–26 shows the mapping of 128-bit Avalon-ST TX packet s to PCI Express TLPs
for a four dword header TLP with non-qword aligned addresses. In this example,
tx_st_empty
is low because the data ends in the upper 64 bits of
tx_st_data
.
Figure 7–25. 128-Bit Avalon-ST tx_st_data Cycle Definition for 4-Dword Header TLP with Qword Aligned Address
coreclkout
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
Header 3 Data 3
Header 2 Data 2
Header 1 Data 1
Header 0 Data 0 Data 4
tx_st_valid
Figure 7–26. 128-Bit Avalon-ST tx_st_data Cycle Definition for 4-Dword Header TLP with non-Qword Aligned Address
Header 3 Data 2
Header 2 Data 1
Data n
Header 1 Data 0
Data n-1
Header 0
Data n-2
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
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