These bits define the VARIABLE field of a
received extended token. These bits are updated when the USB has answered by an
handshake token ACK to a LPM transaction. See Section 2.1.1 Protocol Extension Token
in the reference document “ENGINEERING CHANGE NOTICE, USB 2.0 Link Power Management
Addendum”.
To support the USB2.0 Link Power Management addition the VARIABLE field should be read as described below.
| VARIABLES | Description |
|---|
| VARIABLE[3:0] | bLinkState (1) |
| VARIABLE[7:4] | BESL (2) |
| VARIABLE[8] | bRemoteWake (1) |
| VARIABLE[10:9] | Reserved |
- For a definition of LPM Token bRemoteWake and bLinkState fields, refer to "Table
2-3 in the reference document ENGINEERING CHANGE NOTICE, USB 2.0 Link Power
Management Addendum".
- For a definition of LPM Token BESL field, refer to "Table 2-3 in the reference
document ENGINEERING CHANGE NOTICE, USB 2.0 Link Power Management Addendum" and
"Table X-X1 in Errata for ECN USB 2.0 Link Power Management.
