Altera Arria 10 Avalon-ST Manual do Utilizador Página 70

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Signal Direction Description
rx_st_valid Output Clocks rx_st_data into the Application Layer. Deasserts within
2 clocks of rx_st_ready deassertion and reasserts within 2 clocks
of rx_st_ready assertion if more data is available to send.
For 256-bit data, when you turn on Enable multiple packets per
cycle, bit 0 applies to the entire bus rx_st_data[255:0]. Bit 1 is
not used.
rx_st_err[<n>-1:0]
Output Indicates that there is an uncorrectable error correction coding
(ECC) error in the internal RX buffer. Active when ECC is
enabled. ECC is automatically enabled by the Quartus II
assembler. ECC corrects single-bit errors and detects double-bit
errors on a per byte basis.
When an uncorrectable ECC error is detected, rx_st_err is
asserted for at least 1 cycle while rx_st_valid is asserted.
For 256-bit data, when you turn on Enable multiple packets per
cycle, bit 0 applies to the entire bus rx_st_data[255:0]. Bit 1 is
not used.
Altera recommends resetting the Arria 10 Hard IP for PCI
Express when an uncorrectable double-bit ECC error is detected.
Attention: If you instantiate this IP core as a separate component from the Quartus II IP Catalog, the
Message pane reports the following warning messages:
pcie_a10.pcie_a10_hip_0.tx.st Interface must have an associated reset
pcie_a10.pcie_a10_hip_0.rx.st Interface must have an associated reset
You can safely ignore these warnings because the IP core has a dedicated hard reset pin that is
not part of the Avalon-ST TX or RX interface.
Related Information
Avalon Interface Specifications.
AvalonST RX Component Specific Signals
Table 6-2: Avalon-ST RX Component Specific Signals
Signal Direction Description
rx_st_mask Input
The Application Layer asserts this signal to tell the Hard IP to
stop sending non-posted requests. This signal can be asserted at
any time. The total number of non-posted requests that can be
transferred to the Application Layer after rx_st_mask is asserted
is not more than 10.
6-4
AvalonST RX Component Specific Signals
UG-01145_avst
2015.05.04
Altera Corporation
Interfaces and Signal Descriptions
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