參數(shù)資料
型號(hào): MC68SC302
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(yè)數(shù): 80/218頁(yè)
文件大小: 521K
代理商: MC68SC302
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Communications Processor (CP)
4-34
MC68SC302 USER’S MANUAL
MOTOROLA
conditions) using the BDs to inform the host that the buffers have been serviced. The TxBD
is shown in Figure 4-12.
Figure 4-12. HDLC Transmit Buffer Descriptor
The first word of the TxBD contains status and control bits. Bits 15–10 are prepared by the
user before transmission; bits 9–8 are set by the HDLC controller after the buffer has been
transmitted. Bit 15 is set by the user when the buffer and BD have been prepared and is
cleared by the HDLC controller after the frame has been transmitted.
R—Ready
0 = This buffer is not currently ready for transmission. The user is free to manipulate
this BD (or its associated buffer). The HDLC controller clears this bit after the buffer
has been fully transmitted or after an error condition has been encountered.
1 = The data buffer, which has been prepared for transmission by the user, has not yet
transmitted. No fields of this BD may be written by the user once this bit is set.
W—Wrap (Final BD in Table)
0 = This is not the last BD in the TxBD table.
1 = This is the last BD in the TxBD table. After this buffer has been used, the HDLC
controller will transmit data from the first BD in the table (the BD pointed to by the
TBASE).
I—Interrupt
0 = No interrupt is generated after this buffer has been serviced.
1 = Either TXB or TXE in the HDLC event register will be set when this buffer has been
serviced by the HDLC controller, which can cause an interrupt.
L—Last
0 = This is not the last buffer in the frame.
1 = This is the last buffer in the current frame.
TC—Tx CRC
This bit is valid only when the last (L) bit is set.
0 = Transmit the closing flag after the last data byte. This setting can be used for
testing purposes to send a “bad” CRC after the data.
1 = Transmit the CRC sequence after the last data byte.
UN—Underrun
The HDLC controller encountered a transmitter underrun condition while transmitting the
associated data buffer.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OFFSET + 0
R
-
W
I
L
TC
UN
COL
DATA LENGTH
OFFSET + 2
TX BUFFER POINTER
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