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.
