MSC8113 Reference Manual, Rev. 0
25-144
Freescale Semiconductor
Ethernet Controller
In the RxBD, the user initializes the E, HE, I, and W bits in the first word and the pointer in
second word. If the data buffer is used, the Ethernet controller modifies the E, L, F, M, BC, MC,
LG, NO, SH, CR, OV, and TR bits and writes the length of the used portion of the buffer in the
first word. The Ethernet controller modifies the M, BC, MC, LG, NO, SH, CR, OV, and TR bits
in the first word of the BD only if the L bit is set. The first word of the RxBD contains control and
status bits.
RxBD
8-Byte Receive Buffer Descriptor
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0x00
E
RO1
W
I
L
F
0
M
BC
MC
LG
NO
SH
CR
OV
TR
0x02
Data Length
0x04
RX Data Buffer Pointer
0x06
Table 25-135. 8-Byte Receive Buffer Descriptor Field Descriptions
Offset
Bits
Description
Settings
+ 0x00
E
0
Empty
Indicates whether the data buffer associated with this BD
empty or full. When this bit is cleared, the status and length
fields have been updated as required. This bit is written by the
Ethernet controller when cleared and by the user when set.
0
The data buffer of this BD is
filled with received data, or
data reception is aborted due
to an error condition.
1
The data buffer of this BD is
empty, or reception is currently
in progress.
+ 0x00
RO1
1
Receive Software Ownership
This field is reserved for use by software. Hardware does not
modify this read/write bit, nor does its value affect hardware.
+ 0x00
W
2
Wrap
Indicates whether the next BD is the last one. This bit is written
by user.
0
The next BD is found in the
consecutive location.
1
The next BD is found at the
location defined in RBASE.
+ 0x00
I
3
Interrupt
Specifies whether an interrupt is generated after this buffer is
processed. This bit is written by the user. If you want the
interrupt to occur only if RXF0 occurs, disable RXB0
(IMASK[RXBEN0] is cleared) and enable RXF0
(IMASK[RXFEN0] is set).
0
No interrupt is generated after
this buffer is serviced.
1
IEVENT[RXBn] or
IEVENT[RXFn] are set after
this buffer is serviced. These
bits can cause an interrupt if
enabled (IMASK[RXBENn] or
IMASK[RXFENn]).
+ 0x00
L
4
Last in Frame
Specifies whether this buffer is the last one in the receive
frame. This bit is written by the Ethernet controller.
0
The buffer is not the last in a
frame.
1
The buffer is the last in a frame.
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...