Programming 41
Table 3-31 Device Status Register Bit Definition
Device Status Register Bit Definition: Offset 0x08A
Bit(s)
Field
Description
R/W
15:6
Reserved
R
5
Transactions Pending When set to one, indicates that this function
has issued non-posted request packets
which have not yet been completed.
R
4
Aux Power Detected
Aux power not required. Hardwired to 0
R
3
Unsupported Request
Detected
1 = Error Detected
0 = Error Not Detected
RW1C
2
Fatal Error Detected
1 = Error Detected
0 = Error Not Detected
RW1C
1
Non-Fatal Error
Detected
1 = Error Detected
0 = Error Not Detected
RW1C
0
Correctable Error
Detected
1 = Error Detected
0 = Error Not Detected
RW1C
Table 3-32 Link Capabilities Register Bit Definition
Link Capabilities Register Bit Definition: Offset 0x08C
Bit(s)
Field
Description
R/W
31:24
Port Number
Hardwired to 0x01
R
23:18
Reserved
Hardwired to 000000
R
17:15
L1 Exit Latency
More than 64 micro seconds. Hardwired to 111 R
14:12
L0s Exit Latency
More than 4 micro seconds. Hardwired to 111 R
11:10
Active Stake Link PM
Support
L0s entry supported. Hardwired to 01
R
9:4
Maximum Link Width
X4. Hardwired to 000100
R
3:0
Maximum Speed
2.5 Gb/s Hardwired to 0001
R
Table 3-33 Link Control Register Bit Definition
Link Control Register Bit Definition: Offset 0x090
Bit(s)
Field
Description
R/W
15:8
Reserved
Hardwired to 000
R
7
Extended Sync
1 = 4096 FTS Ordered Sets during L0s state and 1024
TS1 Ordered Sets prior to entering the recovery state
0 = Do not use extended FTS and TS1 ordered sets
R/W
6
Common Clock
Configuration
1 = Uses common clock on both ends of link
0 = Uses separate clocks on each end of link
R/W
5
Retrain link
1 = Retrain Link
0 = Do not Retrain Link
R/W
4
Link Disable
1 = Disable Link
0 = Do not Disable Link
R/W
3
Read Completion
Boundary Control
0 = 64 Byte
1 = 128 Byte
R/W
2
Reserved
1:0
Active State PM
Control
00 = Disabled
01 = L0s Entry Enabled
10 = L1 Entry Enabled
11 = L0s and L1 Entry Enabled
R/W