Cypress EZ-USB FX3 User Manual

EZ-USB FX3 Technical Reference Manual, Document Number: 001-76074 Rev. *F 489
LNK_DEVICE_POWER_CONTROL
0xE0033050
10.15.13 LNK_DEVICE_POWER_CONTROL
USB 3.0 Device Power State Control Register
This register controls the power state change request LCW protocol
31 YES_U2 When host requests transition to U2, automatically accept (send LAU). The interrupt RX_U2 is still
raised for firmware to monitor, take additional power saving actions.
30 YES_U1 When host requests transition to U1, automatically accept (send LAU). The interrupt RX_U1 is still
raised for firmware to monitor, take additional power saving actions.
29 NO_U2 When host requests transition to U2, automatically reject (send LXU). The interrupt RX_U2 is still
raised for firmware to monitor, take additional actions. This bit must be cleared by firmware when
FORCE_PM_ACCEPT is received from host.
28 NO_U1 When host requests transition to U1, automatically reject (send LXU). The interrupt RX_U1 is still
raised for firmware to monitor, take additional actions. This bit must be cleared by firmware when
FORCE_PM_ACCEPT is received from host.
27 AUTO_U2 When host requests transition to U2, automatically accept (send LAU) or rejects (send LXU) depend-
ing on pending activity. The interrupt RX_U2 is still raised for firmware to monitor, take additional
power saving actions.
continued on next page
LNK_DEVICE_POWER_CONTROL USB 3.0 Device Power State Control Register 0xE0033050
b31 b30 b29 b28 b27 b26 b25 b24
YES_U2 YES_U1 NO_U2 NO_U1 AUTO_U2 AUTO_U1
R/W R/W R/W R/W R/W R/W
RRRRRR
000000
LNK_DEVICE_POWER_CONTROL USB 3.0 Device Power State Control Register
b23 b22 b21 b20 b19 b18 b17 b16
LNK_DEVICE_POWER_CONTROL USB 3.0 Device Power State Control Register
b15 b14 b13 b12 b11 b10 b9 b8
EXIT_LP TX_LXU
R/W1S R/W1S
R/W0C R/W0C
00
LNK_DEVICE_POWER_CONTROL USB 3.0 Device Power State Control Register
b7 b6 b5 b4 b3 b2 b1 b0
TX_LAU RX_U3 RX_U2 RX_U1 TX_U3 TX_U2 TX_U1
R/W1SRRR R/W1S R/W1S R/W1S
R/W0C R/W R/W R/W
R/W0C R/W0C R/W0C
0000
000
Bit Name Description

Cypress EZ-USB FX3 Specifications

General

Brand	Cypress
Model	EZ-USB FX3
Category	Controller
Language	English