MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
14-24 Freescale Semiconductor
14.3.4.2.12 Physical Address Upper Register (PAUR)
The PAUR is written by the user. This register contains the upper 16 bits (bytes 4 and 5) of the 48-bit MAC
address used in the address recognition process to compare with the DA (destination address) field of
receive frames with an individual DA. In addition, this register is used in bytes 4 and 5 of the 6-byte Source
Address field when transmitting PAUSE frames. Bits 16:31 of PAUR contain a constant TYPE field
(0x8808) used for transmission of PAUSE frames.This register is not reset, and bits 0:15 must be initialized
by the user. Refer to Section 14.4.10, “Full-Duplex Flow Control” for information on using the TYPE
field.
14.3.4.2.13 Opcode/Pause Duration Register (OPD)
The OPD is read/write accessible. This register contains the 16-bit OPCODE and 16-bit pause duration
(PAUSE_DUR) fields used in transmission of a PAUSE frame. The OPCODE field is a constant value,
0x0001. When another node detects a PAUSE frame, that node will pause transmission for the duration
specified in the pause duration field. This register is not reset and must be initialized by the user. Refer to
Section 14.4.10, “Full-Duplex Flow Control” for information on using the OPD register.
Table 14-16. PALR Field Descriptions
Bits Name Description
0–31 PADDR1 Bytes 0 (bits 0:7), 1 (bits 8:15), 2 (bits 16:23) and 3 (bits 24:31) of the 6-byte
individual address to be used for exact match, and the Source Address field
in PAUSE frames.
0 12 3 4 5 6 7 8 9101112131415
RPADDR2
W
ResetUUUUUUUUUUUUUUU U
Address Base + 0x00E8
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R TYPE
W
Reset 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0
Address Base + 0x00E8
1
“U” signifies a bit that is uninitialized.
Figure 14-14. Physical Address Upper Register (PAUR)
Table 14-17. PAUR Field Descriptions
BIts Name Description
0–15 PADDR2 Bytes 4 (bits 0:7) and 5 (bits 8:15) of the 6-byte individual address to be used
for exact match, and the Source Address field in PAUSE frames.
16–31 TYPE The type field is used in PAUSE frames. These bits are a constant, 0x8808.
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