MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 878

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Enhanced Three-Speed Ethernet Controllers
15.6.3.5.1
To substitute a custom preamble, the user must ensure that:
The definition of the 8-byte custom preamble sequence is shown in
The fields of the custom preamble sequence are described in
preamble octets matching the standard start of frame delimiter (0xD5) can be expected to trigger premature
frame reception by the receiving station.
15.6.3.5.2
To return the received preamble, the user must ensure that:
15-146
Bytes
Byte Offsets
0–1
2–3
4–5
6–7
•
•
•
•
•
0–1
2–3
4–5
6–7
MACCFG2[PreAm TxEN] bit is set
The first TxBD of every frame containing a custom preamble has its PRE bit set
An 8-byte custom preamble sequence appears before the Ethernet DA field in the first transmit data
buffer
MACCFG2[PreAm RxEN] bit is set
Space for an 8-byte preamble sequence is allowed before the Ethernet DA field in the first receive
data buffer of each frame
8–15
8–15
8–15
8–15
Bits
0–7
0–7
0–7
0–7
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
User-Defined Preamble Transmission
User-Visible Preamble Reception
0
PreOct0 Octet #0 of custom transmit preamble. This is the first octet of preamble sent.
PreOct1 Octet #1 of custom transmit preamble. This is the second octet of preamble sent.
PreOct2 Octet #2 of custom transmit preamble. This is the third octet of preamble sent.
PreOct3 Octet #3 of custom transmit preamble. This is the fourth octet of preamble sent.
PreOct4 Octet #4 of custom transmit preamble. This is the fifth octet of preamble sent.
PreOct5 Octet #5 of custom transmit preamble. This is the sixth octet of preamble sent.
PreOct6 Octet #6 of custom transmit preamble. This is the seventh octet of preamble sent. The last octet
Name
—
1
(the start of frame delimiter) is generated by the MAC automatically.
Reserved; should be cleared.
Figure 15-125. Definition of Custom Preamble Sequence
2
Table 15-131. Custom Preamble Field Descriptions
PreOct0
PreOct2
PreOct4
PreOct6
3
4
5
6
7
Description
8
Table
9
15-131. It should be noted that use of
Figure
10
15-125.
11
PreOct1
PreOct3
PreOct5
12
Freescale Semiconductor
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14
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