Altera Stratix V Avalon-ST Manual do Utilizador Página 71

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Table 5-4: 64-, 128-, or 256Bit Avalon-ST TX Datapath
Signal Direction Description
tx_st_data[<n>-1:0]
Input Data for transmission. Transmit data bus. Refer to the following
sections on data alignment for the 64-, 128-, and 256-bit
interfaces for the mapping of TLP packets to tx_st_data and
examples of the timing of this interface. When using a 64-bit
Avalon-ST bus, the width of tx_st_d ata is 64. When using a
128-bit Avalon-ST bus, the width of tx_st_data is 128 bits.
When using a 256-bit Avalon-ST bus, the width of tx_st_data is
256 bits. The Application Layer must provide a properly
formatted TLP on the TX interface. The mapping of message
TLPs is the same as the mapping of Transaction Layer TLPs with
4 dword headers. The number of data cycles must be correct for
the length and address fields in the header. Issuing a packet with
an incorrect number of data cycles results in the TX interface
hanging and becoming unable to accept further requests.
<n> = 64, 128, or 256.
tx_st_sop[<n>-1:0]
Input Indicates first cycle of a TLP when asserted together with tx_st_
valid. <n> = 1 or 2.
When using a 256-bit Avalon-ST bus with Multiple packets per
cycle, bit 0 indicates that a TLP begins in tx_st_data[127:0], bit 1
indicates that a TLP begins in tx_st_data[255:128].
tx_st_eop[<n>-1:0]
Input Indicates last cycle of a TLP when asserted together with tx_st_
valid. <n> = 1 or 2.
When using a 256-bit Avalon-ST bus with Multiple packets per
cycle, bit 0 indicates that a TLP ends with tx_st_data[127:0], bit 1
indicates that a TLP ends with tx_st_data[255:128].
UG-01097_avst
2014.12.15
Avalon-ST TX Interface
5-19
Interfaces and Signal Descriptions
Altera Corporation
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