μ
PD720210
6. Functions Description
R19UH0093EJ0200 Rev.2.00
Page 42 of 59
May 26, 2014
6.2
Remote Wake Up function
6.2.1 Remote Wake Up function
μ
PD720210 supports the Remote Wake Up function in all BC modes. When a Full-Speed device or
Low-Speed device is connected to the downstream port and enumerated by the system, and then
μ
PD720210
transitions to the suspend state, the PPONxB of a downstream port in BC mode is not asserted, to keep VBUS
so that
μ
PD720210 can accept the Remote Wake Up signal from the device. Once the device is removed
during the suspend state, the BC mode of the port is changed as shown Table 6-2.
When
μ
PD720210 is used as Tier 1 Hub such as in Figure 6-3, a downstream port to which a Tier 2 hub is
connected should be set to SDP mode to enable Remote Wake Up function.
Note: Remote Wake Up function is not available when a downstream port to which a Tier 2 hub is connected is
in BC mode.
Figure 6-3. Remote Wake Up Function
μ
PD720210
Tier1
Hub
UP
DN1
DN2
Set SDP Mode
Set BC Mode
HID Class
(Mouse
Keyboard)
Host
DN3
DN4
μ
PD720210
Tier2
Hub
UP
DN1
DN2
DN3
DN4
Содержание Renesas mPD720210
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