IP1000A LF
Preliminary Data Sheet
18/75
July 5, 2005
Copyright © 2005, IC Plus Corp.
IP1000A LF-DS-R08
Table 2-1 : Example Pseudo Packet Field Breakdown
PSEUDO PACKET OFFSET/
LENGTH INDICATOR PAIRS
ACTUAL RELATIVE
OFFSET
ACTUAL LENGTH
INDICATOR
0xC2
0xC
0x2
0x71
0x7
0x1
0xF4
0x10
0x10
0x4
If the pseudo packet shown in Figure 2-2 and described in Table 2-1 is placed into the IP1000A LF’s
transmit FIFO, for each received frame the IP1000A LF will take a CRC over the bytes described inTable
2-2.
Table 2-2 : Relationship Between Pseudo Packet and Receive Frame Bytes
ACTUAL RELATIVE
OFFSET
ACTUAL LENGTH
INDICATOR
BYTE OFFSETS OF RECEIVE
FRAME TO CALCULATE CRC OVER
0xC
0x2
0xC, 0xD
0x7
0x1
0x15
0x10
0x4
0x26, 0x27, 0x28, 0x29
If a CRC calculation over the received frame bytes indicated by the pseudo packet (in this example,
those bytes described byTable 2-2) matches the CRC value in the pseudo packet (in this example
0xF31908D7) the IP1000A LF will assert a wake event. Note, this matching technique may result in false
wake events being reported to the host system as it is possible that more than one set of byte values
specified by the pseudo packet may result in the same CRC value.
The IP1000A LF also supports Magic Packet™ technology developed by Advanced Micro Devices to
allow remote wake-up of a sleeping station on a network via transmission of a special frame. Once the
IP1000A LF has been placed in Magic Packet mode and put to sleep, it scans all incoming frames
addressed to it for a data sequence consisting of 16 consecutive repetitions of its own 48-bit Ethernet
MAC StationAddress. This sequence can be located anywhere within the frame, but must be preceded
by a synchronization stream. The synchronization stream is defined as 6 bytes of 0xFF. For example, if
the MAC address programmed into the StationAddress register is 0x11:22:33:44:55:66, then the
IP1000A LF would be scanning for the frame data shown in Figure 2-3.
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