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Ethernet Interface: Ethernet Address
PmPPC7448 User’s Manual 10006757-02
6-2
ETHERNET ADDRESS
The Ethernet address for your board is a unique identifier on a network and must not be
altered. The address consists of 48 (MAC[47:0]) bits divided into two equal parts. The upper
24 bits define a unique identifier that has been assigned to Emerson Network Power by
IEEE. The lower 24 bits are defined by Emerson for identification of each of our products.
The Ethernet address for the PmPPC7448 is a binary number referenced as 12 hexadecimal
digits separated into pairs, with each pair representing eight bits. The address assigned to
the PmPPC7448 has the following form:
00 80 F9 xx yy zz
00 80 F9 is Emerson’s identifier. The last three bytes of the Ethernet address comprise the
data for the Ethernet addresses in non-volatile memory (NVRAM). The PmPPC7448 has
been assigned the Ethernet address range 00:80:F9:81:00:00 to 00:80:F9:83:FF:FF. The for-
mat is shown in
Table 6-1.
Table 6-1: Ethernet Port Address Numbering
The last pair of hex numbers correspond to the following formula: n — 1000, where n is the
unique serial number assigned to each board. For example, if the serial number of a
PmPPC7448 is 2867, the calculated value is 1867 (74B
16
). Therefore, the board’s port 1
Ethernet address is 00:80:F9:82:07:4B.
ETHERNET CONNECTION (P1)
The Micrel KSZ8721CL 10/100 PHY (port 2) signals are routed to the P1 connector. P1 is a
mini-USB connector available at the front panel. See
Table 6-2 below. The Ethernet cable
(Emerson part number C0007666-00) is shown in
Fig. 6-1.
Offset: MAC: Description:
Ethernet
Identifier (Hex):
Byte 5
15:0
LSB of (serial number -1000) —
Byte 4 MSB of (serial number -1000) —
Byte 3 23:16
Port 2 (front panel debug port, portdbg) 83
Port 1 (portb) 82
Port 0 (porta) 81
Byte 2
47:24 Assigned to Emerson by IEEE
F9
Byte 1 80
Byte 0 00