Altera Arria 10 Avalon-ST - Manual (Page 103)

Interrupts for Endpoints
Refer to Interrupts for detailed information about all interrupt mechanisms.
Table 6-9: Interrupt Signals for Endpoints
Signal Direction Description
app_msi_req Input Application Layer MSI request. Assertion causes an MSI posted
write TLP to be generated based on the MSI configuration
register values and the
app_msi_tc
and
app_msi_num
input
ports.
app_msi_ack Output Application Layer MSI acknowledge. This signal acknowledges
the Application Layer's request for an MSI interrupt.
app_msi_tc[2:0] Input Application Layer MSI traffic class. This signal indicates the
traffic class used to send the MSI (unlike INTX interrupts, any
traffic class can be used to send MSIs).
app_msi_num[4:0] Input MSI number of the Application Layer. This signal provides the
low order message data bits to be sent in the message data field of
MSI messages requested by
app_msi_req
. Only bits that are
enabled by the MSI Message Control register apply.
app_int_sts Input Controls legacy interrupts. Assertion of
app_int_sts
causes an
Assert_INTA message TLP to be generated and sent upstream.
Deassertion of
app_int_sts
causes a Deassert_INTA message
TLP to be generated and sent upstream.
app_int_ack Output This signal is the acknowledge for
app_int_sts
. It is asserted for
at least one cycle either when either of the following events occur:
• The
Assert_INTA
message TLP has been transmitted in
response to the assertion of the
app_int_sts
.
• The
Deassert_INTA
message TLP has been transmitted in
response to the deassertion of the
app_int_sts
signal.
UG-01145_avst
2015.05.04
Interrupts for Endpoints 6-37
Interfaces and Signal Descriptions Altera Corporation
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