K60P100M100SF2RM Datasheet, PDF (1215/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 44 10/100-Mbps Ethernet MAC (ENET)
Table 44-84. Enhanced uDMA Receive Buffer Descriptor (RxBD) (continued)
Offset + 12 — — — — — — — — — — — — — — — —
Offset + 14
1588 timestamp [31:16]
Offset + 16
1588 timestamp [15:0]
Offset + 18 — — — — — — — — — — — — — — — —
Offset + 1A — — — — — — — — — — — — — — — —
Offset + 1C — — — — — — — — — — — — — — — —
Offset + 1E — — — — — — — — — — — — — — — —
Word
Offset + 0
Offset + 0
Offset + 0
Offset + 0
Offset + 0
Offset + 0
Offset + 0
Offset + 0
Table 44-85. Receive Buffer Descriptor Field Definitions
Field
15
E
14
RO1
13
W
12
RO2
11
L
10–9
8
M
7
BC
Description
Empty. Written by the MAC (=0) and user (=1).
0 The data buffer associated with this BD is filled with received data, or data
reception has aborted due to an error condition. The status and length
fields have been updated as required.
1 The data buffer associated with this BD is empty, or reception is currently
in progress.
Receive software ownership. This field is reserved for use by software. This
read/write bit is not modified by hardware, nor does its value affect hardware.
Wrap. Written by user.
0 The next buffer descriptor is found in the consecutive location
1 The next buffer descriptor is found at the location defined in
ENETn_RDSR
Receive software ownership. This field is reserved for use by software. This
read/write bit is not modified by hardware, nor does its value affect hardware.
Last in frame. Written by the uDMA.
0 The buffer is not the last in a frame.
1 The buffer is the last in a frame.
Reserved, must be cleared.
Miss. Written by the MAC. This bit is set by the MAC for frames accepted in
promiscuous mode, but flagged as a miss by the internal address recognition.
Therefore, while in promiscuous mode, you can use the M-bit to quickly
determine whether the frame was destined to this station. This bit is valid only if
the L and PROM bits are set.
0 The frame was received because of an address recognition hit
1 The frame was received because of promiscuous mode
The information needed for this bit comes from the
promiscuous_miss(ff_rx_err_stat[26]) sideband signal.
Set if the DA is broadcast (FFFF_FFFF_FFFF).
Table continues on the next page...
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
1215