Altera Stratix V Avalon-ST User Manual
Page 50
This interface also includes signals to set and clear the individual bits in the MSI Pending Bit Register.
Table 4-8: MSI Interrupts
Signal
Direction
Description
app_msi_req
Input
When asserted, the Application Layer is requesting that an MSI
interrupt be sent. Assertion causes an MSI posted write TLP to be
generated. The MSI TLP uses
app_msi_req_fn[7:0]
,
app_msi_
tc
and
app_msi_num
for a
timing diagram.
app_msi_req_fn[7:0]
Input
Specifies the function generating the MSI or MSI-X interrupt.
Driven in the same cycle as
app_msi_req
or
app_msix_req
.
app_msi_ack
Output
Ack for MSI interrupts. When asserted, indicates that Hard IP
has sent an MSI posted write TLP in response
app_msi_req
. The
Application Layer must wait for
app_msi_ack
after asserting
app_msi_req
. The Application Layer must de-assert
app_msi_
req
for at least 1 cycle before signaling a new MSI interrupt.
app_msi_addr_
pf[127:0]
Output
Driven by the MSI address registers of PF0 and PF1.
app_msi_
addr_pf[63:0]
specifies the PF0 address.
app_msi_addr_
pf[127:64]
specifies the PF1 address.
app_msi_data_pf[16<n>
-1:0]
Output
Driven by the MSI Data Registers of PF0 and PF1. <n>= the
number of PFs.
app_msi_enable_
pf[1:0]
Output
Driven by the MSI Enable bit of the MSI Control Registers of PF0
and PF1.
app_msi_mask_pf[32<n>
-1:0]
Output
The MSI Mask Bits of the MSI Capability Structure drive
app_
msi_mask_pf
. This mask allows software to disable or defer
message sending on a per-vector basis.
app_msi_mask_pf[31:0]
mask vectors for PF0.
app_msi_mask_pf[63:32]
mask vectors
for PF1.
app_msi_multi_msg_
enable_pf[5:0]
Output
Defines the number of interrupt vectors enabled for each PF. The
following encodings are defined:
• 3'b000: 1 vector
• 3'b001: 2 vectors
• 3'b010: 4 vectors
• 3'b100: 16 vectors
• 3'b101: 32 vectors
The MSI Multiple Message Enable field of the MSI Control
Register of PF0 drives
app_msi_multi_msg_enable_pf[2:0]
.
The MSI Multiple Message Enable field of the MSI Control
Register of PF1 drives
app_msi_multi_msg_enable_pf[5:3]
.
UG-01097_sriov
2014.12.15
Interrupt Interface
4-15
Interfaces and Signal Descriptions
Altera Corporation