Altera Arria V Avalon-ST Uživatelský manuál Strana 45

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Figure 4-4: 64-Bit Avalon-ST rx_st_data<n> Cycle Definition for 3-Dword Header TLPs with Qword
Aligned Address
In the following figure, rx_st_be[7:4] corresponds to rx_st_data[63:32]. rx_st_be[3:0]
corresponds to rx_st_data[31:0].
clk
rx_st_data[63:32]
rx_st_data[31:0]
rx_st_sop
rx_st_eop
rx_st_be[7:4]
rx_st_be[3:0]
Header 1 Data1 Data3
Header 0 Header2 Data0 Data2
F 1
FE
Figure 4-5: 64-Bit Application Layer Backpressures Transaction Layer
The following figure illustrates the timing of the RX interface when the Application Layer backpressures
the Arria V Hard IP for PCI Express by deasserting rx _st_ready. The rx_st_valid signal deasserts
within three cycles after rx_st_ready is deasserted. In this example, rx_st_valid is deasserted in the
next cycle. rx_st_data is held until the Application Layer is able to accept it.
pld_clk
rx_st_data[63:0]
rx_st_sop
rx_st_eop
rx_st_ready
rx_st_valid
000
.
010
.
CCCC0002CCCC0001 CC
.
CC
.
CC
.
CC
.
CC
.
CC
.
4-8
Data Alignment and Timing for the 64Bit AvalonST RX Interface
2014.12.15
Altera Corporation
Interfaces and Signal Descriptions
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