Altera Arria 10 Avalon-ST - Manual (Page 72)

Signal Direction Description
rx_st_be[<n>-1:0]
Output Byte enables corresponding to the
rx_st_data
. The byte enable
signals only apply to PCI Express Memory Write and I/O Write
TLP payload fields. When using 64-bit Avalon-ST bus, the width
of
rx_st_be
is 8 bits. When using 128-bit Avalon-ST bus, the
width of
rx_st_be
is 16 bits. This signal is optional. You can
derive the same information by decoding the
FBE
and
LBE
fields
in the TLP header. The byte enable bits correspond to data bytes
as follows:
•
rx_st_data[127:120]
=
rx_st_be[15]
•
rx_st_data[119:112]
=
rx_st_be[14]
•
rx_st_data[111:104]
=
rx_st_be[13]
•
rx_st_data[95:88]
=
rx_st_be[12]
•
rx_st_data[87:80]
=
rx_st_be[11]
•
rx_st_data[79:72]
=
rx_st_be[10]
•
rx_st_data[71:64]
=
rx_st_be[9]
•
rx_st_data[7:0]
=
rx_st_be[8]
•
rx_st_data[63:56]
=
rx_st_be[7]
•
rx_st_data[55:48]
=
rx_st_be[6]
•
rx_st_data[47:40]
=
rx_st_be[5]
•
rx_st_data[39:32]
=
rx_st_be[4]
•
rx_st_data[31:24]
=
rx_st_be[3]
•
rx_st_data[23:16]
=
rx_st_be[2]
•
rx_st_data[15:8]
=
rx_st_be[1]
•
rx_st_data[7:0]
=
rx_st_be[0]
This signal is deprecated.
rx_st_parity[<n>-1:0]
Output
The IP core generates byte parity when you turn on Enable byte
parity ports on Avalon-ST interface on the System Settings tab
of the parameter editor. Each bit represents odd parity of the
associated byte of the
rx_st_data
rx_st_data bus. For example,
bit[0] corresponds to
rx_st_data[7:0]
rx_st_data[7:0], bit[1]
corresponds to
rx_st_data[15:8]
.
For more information about the Avalon-ST protocol, refer to the Avalon Interface Specifications.
Related Information
Avalon Interface Specifications.
Data Alignment and Timing for the 64‑Bit Avalon‑ST RX Interface
To facilitate the interface to 64-bit memories, the Arria 10 Hard IP for PCI Express aligns data to the
qword or 64 bits by default. Consequently, if the header presents an address that is not qword aligned, the
Hard IP block shifts the data within the qword to achieve the correct alignment.
6-6 Data Alignment and Timing for the 64‑Bit Avalon‑ST RX Interface
UG-01145_avst
2015.05.04
Altera Corporation Interfaces and Signal Descriptions
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