Altera Arria V Avalon-ST Manual do Utilizador Página 56

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Data0 = {pcie_data_byte3, pcie_data_byte2, pcie_data_byte1, pcie_data_byte0}
Data1 = {pcie_data_byte7, pcie_data_byte6, pcie_data_byte5, pcie_data_byte4}
Figure 4-17: 64-Bit Avalon-ST tx_st_data Cycle Definition for TLP 4-Dword Header with Non-Qword
Aligned Address
pld_clk
tx_st_data[63:32]
tx_st_data[31:0]
tx_st_sop
tx_st_eop
Header 1 Header3 Data0 Data2
Header 0 Header2 Data1
Figure 4-18: 64-Bit Transaction Layer Backpressures the Application Layer
The following figure illustrates the timing of the TX interface when the Arria V Hard IP for PCI Express
pauses transmission by the Application Layer by deasserting tx_st_ready. Because the readyLatency is
two cycles, the Application Layer deasserts tx_st_valid after two cycles and holds tx_st_data until two
cycles after tx_st_ready is asserted.
coreclkout
tx_st_sop
tx_st_eop
tx_st_ready
tx_st_valid
tx_st_err
tx_st_data[63:0] . . . . . . . . . .
readyLatency
00. . 00 ... BB... BB ... BBBB0306BBB0305 BB... BB.. BB ... BB ... BB ... BB ... BB... .
2014.12.15
Data Alignment and Timing for the 64Bit AvalonST TX Interface
4-19
Interfaces and Signal Descriptions
Altera Corporation
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