Altera Arria V Avalon-ST Manual de usuario Pagina 59

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Header 3 Data 2
Header 2 Data 1
Data n
Header 1 Data 0
Data n-1
Header 0
Data n-2
pld_clk
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 4-24: 128-Bit Back-to-Back Transmission on the Avalon-ST TX Interface
The following figure illustrates back-to-back transmission of 128-bit packets with idle dead cycles between
the assertion of tx_st_eop and tx_st_sop.
pld_clk
tx_st_data[127:0]
tx_st_sop
tx_st_eop
tx_st_empty
tx_st_ready
tx_st_valid
tx_st_err
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4-25: 128-Bit Hard IP Backpressures the Application Layer for TX Transactions
The following figure illustrates the timing of the TX interface when the Arria V Hard IP for PCI Express
pauses 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 reasserted
4-22
Data Alignment and Timing for the 128Bit AvalonST TX Interface
2014.12.15
Altera Corporation
Interfaces and Signal Descriptions
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