
PCI Express to Serial ATA Controller
Silicon Image, Inc.
6.1.14 MSI Capability
Address Offset: 5C
H
Access Type: Read/Write
Reset Value: 0x0080_7005
Data Sheet
2006 Silicon Image, Inc.
SiI-DS-0208-C
49
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Reserved
6
Multiple
Message
Enable
Multiple
Message
Capable
M
Next Capability Pointer
Capability ID
This register defines the MSI Capability Message Control. The register bits are defined below.
Bit [31:24]
: Reserved (R) – This bit field is reserved and returns zeros on a read.
Bit [23]
: 64-bit Addr (R) – 64-bit Address Capable. This bit is hardwired to 1.
Bit [22:20]
: Multiple Message Enable (R/W) – This bit field defaults to 000
B
.
Bit [19:17]
: Multiple Message Capable (R) – This bit field is hardwired to 000
B
.
Bit [16]
: MSI Enable (R/W) – This bit is set to enable Message Signaled Interrupts.
Bit [15:08]
: Next Capability Pointer (R) –Next Capability Pointer. This bit field is hardwired to 70
H
to point to the
3
Capabilities register, the PCI Express Capability.
Bit [07:00]
: Capability ID (R) – This bit field is hardwired to 05
H
to indicate that this is a MSI Capability.
6.1.15 Message Address
Address Offset: 60
H
-67
H
Access Type: Read/Write
Reset Value: 0x0000_0000_0000_0000
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
Message Address Upper
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Message Address
00
This register specifies the memory address for an MSI memory write transaction. The memory address must be of a Dword
(bits 1:0 must be 0).
6.1.16 MSI Message Data
Address Offset: 68
H
Access Type: Read/Write
Reset Value: 0x0000_0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Reserved
Message Data
This register specifies the MSI Message Data. The register bits are defined below.
Bit [31:16]
: Reserved (R) – This bit field is reserved and returns zeros on a read.
Bit [15:00]
: Message Data (R/W) – This bit field specifies the Message Data for an MSI memory write
transaction.