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| 型號： | MC68QH302 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 32-Bit Microprocessor(32位微處理器) |
| 中文描述： | 32位微處理器（32位微處理器） |
| 文件頁數(shù)： | 37/50頁 |
| 文件大小： | 6613K |
| 代理商： | MC68QH302 |
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28
MC68QH302 Supplement to the MC68302 Users Manual
MOTOROLA
Table 27. Rx Status and Control Field Descriptions
Bit(s)
Name
Description
15
E
1
Empty
0 = The data buffer associated with this BD has been filled with data, or data reception was
aborted due to error condition. The host is free to examine or write to any field of the BD.
1 = The data buffer associated with this BD is empty. The host should not write to any field of
this BD after it sets this bit. Cleared by the receiver when the buffer is full or frame reception
was stopped due to an end-of-frame or an error.
14
—
Reserved
13
W
1
Wrap
0 = Not the last BD in Rx BD table
1 = The last BD in Rx BD table
12
I
1
Interrupt
0 = The RXB bit is not set after this buffer is used, but RXF operation remains unaffected.
1 = The RXB bit in the event register (SCCE) will be set.
11
L
2
Last. Set by the receiver when this buffer is the last in a frame, implying the end-of-frame
reception due to a closing flag, in HDLC mode, or an error.
0 = Not the last buffer in the frame.
1 = The last buffer in the frame.
10
F
2
First. Set by the receiver when this buffer is the first in a frame.
0 = Not the first buffer in the frame.
1 = The first buffer in the frame.
9–5
—
Reserved
4
NO
2
Rx non-octet-aligned. A frame that contained a number of bits not exactly divisible by 8 was
received. The last data word written into a non-octet BD is undefined and should be discarded
by software.
3
AB
2
Rx abort sequence. At least seven consecutive ‘1’s occurred during frame reception. Valid for
HDLC mode only.
2
CR
2
CRC error. The frame contains a CRC error.
1
OV
2
Overrun. A receiver overrun occurred. Not set for B channels.
0
CD
2
Carrier detect lost. The carrier detect (CD) signal was negated during frame reception. Valid for
NMSI channels only.
Notes:
1
Written by the user before the buffer is linked to the Rx buffer descriptor table
2
Updated by the receiver after the data has been placed into its buffer
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