Ethernet Controller Programming Model
MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
25-73
OSTBD is the out-of-sequence TxBD register, which includes the status/control and data length
in the same format as a regular TxBD. It is useful for sending flow control frames. The
OSTBD[R] is always checked between frames. If it is not ready, a regular frame is sent. You
must set OSTBD[L] while preparing this BD. If a flow control frame is sent and OSTBD[I] is set,
a TXC event is generated after frame transmission. This register must be cleared while not in use.
When the Ethernet controller is in pause mode, the out-of-sequence BD cannot be used to send
another flow control frame because the MAC regards it as a regular TxBD.
OSTBD
Out-of-Sequence TxBD Register
Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
PAD
W
I
L
TC
DEF
—
LC
RL
RC
UN
—
Type
R/W
R
Reset
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Bit
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
OSTBDLEN
Type
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 25-44. OSTBD Bit Descriptions
Bit
Reset
Description
Settings
R
0
0
Ready
Indicates whether the data buffer associated with a BD is ready
for transmission. When this bit is cleared, you can
manipulate this BD or its associated data buffer. The Ethernet
controller clears this bit after the buffer is transmitted or after
an error condition is encountered.
When this bit is set, you cannot write to any fields of this BD.
This bit is written by the Ethernet controller and the user.
0
The data buffer associated with
this BD is not ready for
transmission.
1
The data buffer that the user
has prepared for transmission
was not transmitted or is
currently being transmitted.
PAD
1
0
Padding for Short Frames
Enables/disables padding for short frames. This bit is cleared
only while one TxBD is used (L is set) and the
MACCFG2R[PADCRC, CRCEN] bits are cleared. Otherwise,
pads are added to short frames. When PAD is set, padding
bytes are inserted until the length of the transmitted frame
equals 64 bytes. Unlike the MPC8260 device, which pads up to
the MINFLR value, the Ethernet controller always pads up to
the IEEE minimum frame length of 64 bytes.
0
Do not add padding to short
frames unless TxBD[TC] is set.
1
Add padding to short frames.
W
2
0
Wrap
Wrap, written by user. This bit is ignored by the Ethernet
controller.
0
The next BD is found in the
consecutive location
1
The next BD is found at the
location defined by the user.
I
3
0
Interrupt
Causes an interrupt if IEVENT[TXFEN] is enabled.
This bit is written by user.
0
No interrupt is generated after
this buffer is serviced.
1
IEVENT[TXF] is set after this
buffer is serviced.
L
4
1
Last in Frame
The OSTBD is always the last in the frame, so L is always set.
This bit is hardwired to a value of 1
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 ...