K60P100M100SF2RM Datasheet, PDF (1213/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 44 10/100-Mbps Ethernet MAC (ENET)
ENETn_RCR[LOOP],
Figure 44-63. Loopback Options
44.4.13 Legacy Buffer Descriptors
To support the Ethernet controller on previous Freescale devices, legacy FEC buffer
descriptors are available. To enable legacy support, clear ENETn_ECR[1588EN].
44.4.13.1 Legacy Receive Buffer Descriptor
The following figureshows the legacy FEC receive buffer descriptor. Table 44-85
contains the descriptions for each field.
NOTE
The following addresses are shown for a big endian
implementation.
Table 44-82. Legacy FEC Receive Buffer Descriptor (RxBD)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Offset + 0 E RO1 W RO2 L — — M BC MC LG NO — CR OV TR
Offset + 2
Data length
Offset + 4
Rx data buffer pointer - A[31:16]
Offset + 6
Rx data buffer pointer - A[15:0]
44.4.13.2 Legacy Transmit Buffer Descriptor
The following figureshows the legacy FEC transmit buffer descriptor. Table 44-87
contains the descriptions for each field.
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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