Specification Sheet

Datasheet, Volume 2 of 2 159
DMIBAR Registers
6.23 DMI Link Status (LSTS)—Offset 8Ah
Indicates DMI status.
Access Method
Default: 1h
Type: MEM
(Size: 16 bits)
Offset: [B:0, D:0, F:0] + 8Ah
15 12 8 4 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
RSVD
LTRN
RSVD
NWID
NSPD
Bit
Range
Default &
Access
Field Name (ID): Description
15:12
0h
RO
Reserved (RSVD): Reserved.
11
0h
ROV
LTRN: Link Training: Indicates that the Physical Layer LTSSM is in the Configuration or
Recovery state, or that 1b was written to the Retrain Link bit but Link training has not
yet begun. Hardware clears this bit when the LTSSM exits the Configuration/Recovery
state once Link training is complete.
10
0h
RO
Reserved (RSVD): Reserved.
9:4
0h
ROV
NWID: Negotiated Width: Indicates negotiated link width. This field is valid only when
the link is in the L0, L0s, or L1 states (after link width negotiation is successfully
completed).
00h: Reserved
01h: X1
02h: X2
04h: X4
All other encodings are reserved.
3:0
1h
ROV
NSPD: Negotiated Speed: Indicates negotiated link speed.
1h: 2.5 Gb/s
2h: 5.0 Gb/s
All other encodings are reserved.
The value in this field is undefined when the Link is not up.