PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 736
PNX1500E
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PNX1500E
Description
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NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
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PNX15XX_PNX952X_SER_N_4
Product data sheet
5.13.2 Filtering for WoL
5.13.3 Magic Packet WoL
additional filter for magic packet detection. In both cases, a WoL event is only
triggered if the triggering packet has a valid CRC.
functionality.
The following subsections describe the two WoL mechanisms.
The
for a Wake-up event. Before going into a power-down condition, the power
management software should clear the register by writing the RxFilterWolClear
register.
The receive filter functionality as described in
WoL events. If the RxFilterEnWoL bit of the RxFilterCtrl register is set, the receive
filter will set the WakeupInt bit of the IntStatus register if a packet is received that
passes the filter. The interrupt will only be generated if the CRC of the packet is
correct.
In case a wake-up is generated by the receive filter, the RxFilterWoL bit in the
RxFilterWoLStatus register will be set along with the origin of the filter match, which
will be set in the AcceptPerfectWoL, AcceptMulticastHashWoL,
AcceptUnicastHashWoL, AcceptMulticastWoL, AcceptBroadcastWoL,
AcceptUnicastWoL bits of the same register. Software can reset these bits by writing
a 1 to the corresponding bits of the RxFilterWoLClear register.
The LAN100 supports wake-up using AMD's Magic Packet technology (see “Magic
Packet technology”, Advanced Micro Devices). A Magic Packet is a specially formed
packet solely intended for wake-up purposes. This packet can be received, analyzed
and recognized by the Ethernet module and used to trigger a wake-up event.
A packet is a Magic Packet if it contains the station address repeated 16 times in its
data portion with no breaks or interruptions, preceded by six synchronization bytes
with the value 0xFF. Other data may surround the Magic Packet pattern in the data
portion of the packet. The whole packet must be a well-formed Ethernet frame.
The magic packet detection unit analyzes the Ethernet packets, extracts the packet
address and checks the payload for the Magic Packet pattern. The address from the
packet is used for matching the pattern (not the address in the SA0/1/2 registers). A
magic packet only sets the wake-up interrupt status bit if the packet passes the
receive filter, as illustrated in figure
with the magic packet filter result to produce the final result.
Magic Packet filtering is enabled by setting the MagicPacketEnWoL bit of the
RxFilterCtrl register. Note that when doing Magic Packet WoL, the RxFilterEnWoL bit
in the RxFilterCtrl register should be 0. Setting the RxFilterEnWoL bit to 1 would
accept all packets for a matching address, not just the Magic Packets, that is, WoL
using Magic Packets is more strict.
RxFilterWoLStatus
Rev. 4.0 — 03 December 2007
Chapter 23: LAN100 — Ethernet Media Access Controller
register can be read by the software to inspect the reason
Figure
13: the result of the receive filter is ANDed
Section 5.12
PNX15xx/952x Series
Figure 13
can be used to generate
illustrates the wake-up
© NXP B.V. 2007. All rights reserved.
23-736
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