LAN9500AI datasheet(100/213 Pages) MICROCHIP

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LAN950x

DS00001875A-page 100

 2010 - 2015 Microchip Technology Inc.

This state supports wakeup from GPIO assertion, PHY Link Up, and on reception of a frame passing the filtering con-

straints set by the MAC Control Register (MAC_CR). Due to the limited amount of RX FIFO buffering, it is possible that

there will be frames lost when in this state, as the USB resume time greatly exceeds the buffering capacity of the FIFO.

The Wake-On-LAN bit of the Wakeup Status (WUPS) field of the Power Management Control Register (PMT_CTL) is

used to signal wakeup due to reception of a frame passing the aforementioned filtering constraints. This bit, along with

the GPIO [10:0] (GPIOx_INT) bits of the Interrupt Status Register (INT_STS), may be examined to determined the

event(s) causing the wakeup. If GPIO7 is found to have caused the wakeup, the PHY Link Up Enable (PHY_LINK-

UP_EN) bit of the General Purpose IO Wake Enable and Polarity Register (GPIO_WAKE) may be examined to deter-

mined whether a PHY Link Up event or pin event occurred.

Note 1: Wake-On-LAN events MUST NOT be enabled in the Wakeup Control and Status Register (WUCSR)

while operating in the SUSPEND3 state. If any Wake-On-LAN Event is enabled in WUCSR, all

received frames will be dropped. The setting of the Wake-On-Lan Enable (WOL_EN) bit of the Power

Management Control Register (PMT_CTL) is a “don’t care”.

2: The Wake-On-LAN bit of the Wakeup Status (WUPS) is used to signal both Wake-On-LAN events and

wakeup from SUSPEND3 state due to reception of frames passing the filtering constraints set by the MAC

Control Register (MAC_CR). In order to interpret the Wakeup Status (WUPS) without ambiguity, the soft-

ware driver may examine the Suspend Mode (SUSPEND_MODE) field of the Power Management Control

5.12

Wake Events

The following events can wake up/enable the device, depending on the power state.

• USB Host Resume

• VBUS_DET assertion

• Wake On LAN (Wakeup Frame, Magic Packet, Perfect Destination Address Frame, and Broadcast Frame)

• Reception of a “Good Frame” - (Note 5-4) a frame received when no Wake-On-LAN events are enabled in the

Wakeup Control and Status Register (WUCSR) that meets the filtering requirements configured in the MAC Con-

trol Register (MAC_CR).

• PHY Energy Detect

• PHY Link Up

• GPIO[10:0]

Note 5-4

Not Supported by LAN9500/LAN9500i.

Table 5-66 illustrates the wake events permitted in each of the power states.

Note 5-5

Not Supported by LAN9500/LAN9500i.

The occurrence of a GPIO wake event causes the corresponding bit in the Interrupt Status Register (INT_STS) to be

set. Before suspending the device, the Host must ensure that any pending wake events are cleared. Otherwise, the

device will immediately be awakened after being suspended.

5.12.1

DETECTING WAKEUP EVENTS

The wakeup detection logic for LAN9500A/LAN9500Ai is a super set of that of LAN9500/LAN9500i. All of these devices

support the ability to generate remote wake events on detection of a GPIO event, WOL event, or Ethernet link status

change (energy detect) as primitives. An extension of the WOL event class, to provide for Perfect DA Frame Received,

TABLE 5-66:

POWER STATE/WAKE EVENT MAPPING

Power State

USB Host

Resume

Signaling

VBUS_DET

WOL

Good

Frame

Note 5-5

PHY

Energy

Detect

PHY

Link Up

GPIO[10:0]

SUSPEND0

YES

SUSPEND1

YES

SUSPEND2

YES

SUSPEND3

Note 5-5

YES

UNPOWERED

YES

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