SH7713 datasheet(705/904 Pages) RENESAS

705 / 904 page

Section 18 Ethernet Controller (EtherC)

Rev.1.50 Aug. 30, 2006 Page 665 of 860

REJ09B0288-0150

MDC

(1)

Write to PHY interface

MMD = 0

MDC = 0

Independent bus release

timing relationship

MDO

Figure 18.6 (4) Independent Bus Release Flowchart (IDLE in Write in Figure 18.5)

18.4.5

Magic Packet Detection

The EtherC has a Magic Packet detection function. This function provides a Wake-On-LAN

(WOL) facility that activates various peripheral devices connected to a LAN from the host device

or other source. This makes it possible to construct a system in which a peripheral device receives

a Magic Packet sent from the host device or other source, and activates itself. When the Magic

Packet is detected, data is stored in the FIFO of the E-DMAC by the broadcast packet that has

received data previously and the EtherC is notified of the receiving status. To return to normal

operation from the interrupt processing, initialize the EtherC and E-DMAC by using ARST bit in

the software reset register (ARSTR).

With a Magic Packet, reception is performed regardless of the destination address. As a result, this

function is valid, and the WOL pin enabled, only in the case of a match with the destination

address specified by the format in the Magic Packet. Further information on Magic Packets can be

found in the technical documentation published by AMD Corporation.

The procedure for using the WOL function with this LSI is as follows.

1. Disable interrupt source output by means of the various interrupt enable/mask registers.

2. Set the Magic Packet detection enable bit (MPDE) in the EtherC mode register (ECMR).

3. Set the Magic Packet detection interrupt enable bit (MPDIP) in the EtherC interrupt enable

4. If necessary, set the CPU operating mode to sleep mode or set peripheral modules to module

standby mode.

5. When a Magic Packet is detected, an interrupt is sent to the CPU. The WOL pin notifies

peripheral LSIs that the Magic Packet has been detected.

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