AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE Guia do Utilizador Página 112

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7–14 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 7–14 shows the mapping of 128-bit Avalon-ST RX packets to PCI Express TLPs
for a four dword header with qword aligned addresses.
Figure 7–15 illustrates the timing of the RX interface when the Application Layer
backpressures the Hard IP by deasserting
rx_st_ready
. The
rx_st_valid
signal must
deassert within three cycles after
rx_st_ready
is deasserted. In this example,
rx_st_valid
is deasserted in the next cycle.
Figure 7–14. 128-Bit Avalon-ST rx_st_data Cycle Definition for 4-Dword Header TLP with Qword Aligned Address
coreclkout
rx_st_valid
rx_st_data[127:96]
rx_st_data[95:64]
rx_st_data[63:32]
rx_st_data[31:0]
rx_st_sop
rx_st_eop
rx_st_empty
Header3 Data3 Data n
Header 2 Data 2 Data n-1
Header 1 Data 1 Data n-2
Header 0 Data 0 Data n-3
Figure 7–15. 128-Bit Application Layer Backpressures Hard IP Transaction Layer for RX Transactions
coreclkout
rx_st_data[127:0]
rx_st_sop
rx_st_eop
rx_st_empty
rx_st_ready
rx_st_valid
4562 . . . c19a . . . 0217b . . . 134c . . . 8945 . . .3458ce. . . 2457ce. . .000a7896c000bc34. .
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