MSI-X Vector Table and PBA (0x8) - 1.0 English

Versal ACAP DMA and Bridge Subsystem for PCI Express Product Guide (PG344)
Document ID
PG344
Release Date
2022-05-20
Version
1.0 English

The MSI-X Vector table and PBA are described in the following table. MSI-X table offsets start at 0x8000. The table below shows two MSI-X vector entries (MSI-X table has 32 vector entries). PBA address offsets start at 0x8FE0. Address offsets are fixed values.

Note: The MSI-X enable in configuration control register should be asserted before writing to MSI-X table. If not, the MSI-X table will not work as expected.
Table 1. MSI-X Vector Table and PBA (0x00–0xFE0)
Byte Offset Bit Index Default Access Type Description
0x00 31:0 32’h0 RW

MSIX_Vector0_Address[31:0]

MSI-X vector0 message lower address.
0x04 31:0 32’h0 RW

MSIX_Vector0_Address[63:32]

MSI-X vector0 message upper address.
0x08 31:0 32’h0 RW

MSIX_Vector0_Data[31:0]

MSI-X vector0 message data.
0x0C 31:0 32'hFFFFFFFF RW

MSIX_Vector0_Control[31:0]

MSI-X vector0 control.

Bit Position:

31:1: Reserved.

0: Mask. When set to 1, this MSI-X vector is not used to generate a message. When reset to 0, this MSI-X Vector is used to generate a message.
0x1F0 31:0 32’h0 RW

MSIX_Vector31_Address[31:0]

MSI-X vector31 message lower address.
0x1F4 31:0 32’h0 RW

MSIX_Vector31_Address[63:32]

MSI-X vector31 message upper address.
0x1F8 31:0 32’h0 RW

MSIX_Vector31_Data[31:0]

MSI-X vector31 message data.
0x1FC 31:0 32'hFFFFFFFF RW

MSIX_Vector31_Control[31:0]

MSI-X vector31 control.

Bit Position:

31:1: Reserved.

0: Mask. When set to one, this MSI-X vector is not used to generate a message. When reset to 0, this MSI-X Vector is used to generate a message.
0xFE0 31:0 32’h0 RW

Pending_Bit_Array[31:0]

MSI-X Pending Bit Array. There is one bit per vector. Bit 0 corresponds to vector0, etc.