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| 型號(hào)： | 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)： | 40/50頁 |
| 文件大小： | 6613K |
| 代理商： | MC68QH302 |
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MOTOROLA
MC68QH302 Supplement to the MC68302 Users Manual
31
2.13.1 B-Channel Host Commands
The B-channel host commands are described in Table 31. Note that the B-channel receivers
do not have an
ENTER
HUNT
MODE
option and must be explicitly stopped and restarted.
2.13.2 D-Channel Host Commands
The D-channel host commands are described in Table 32.
Table 31. B-Channel Host Commands
B-Channel
Command
Description
STOP
TX
STOP
TX
stops a Tx B channel. It must be issued after a transmit error or if the B-channel parameters
need to be modified.
STOP
TX
clears B_STAT2[BTV] of the designated B channel, invalidating the
channel. The B channel transmission is aborted and idle characters (‘1’s) are sent. The host can now
modify the parameters. In HDLC mode, an HDLC abort pattern is sent.
Note: If the
STOP
TX
is for a B channel programmed in flag mode (see Section 2.6.4, “BTMODE—B-
Channel Transmit Mode”), the B channel goes into idle mode, sending idle characters (‘1’s) following
the abort sequence. After executing
RESTART
TX
, the channel starts from its initial state as
programmed in the BTMODE register.
RESTART
TX
RESTART
TX
initiates transmission on a B channel following a
STOP
TX
command or an underrun error.
The command sets B_STAT2[BTV] and clears B_STAT2[BUN] of the designated B channel. The
channel is now considered running (prohibiting parameter modification), and the first Tx buffer
descriptor is polled.
STOP
RX
STOP
RX
stops a Rx B channel. It must be issued after a receive error or if the B-channel parameters
need to be modified.
STOP
RX
clears the B_STAT1[BRV] of the designated B channel, invalidating the
channel. The host can now modify the parameters (see Section 2.14, “QH Parameters Initialization
Summary,” for B-channel parameter initialization).
RESTART
RX
RESTART
RX
initiates reception on a B channel, setting B_STAT1[BRV] of the designated B channel.
The channel is now considered running, prohibiting parameter modification. The receiver searches for
the start-of-frame condition on the receive data line to fill the first Rx buffer with data.
Table 32. D-Channel Host Commands
D-Channel
Command
Description
STOP
TX
STOP
TX
stops the channel. It must be issued after a transmit error or if the channel parameters need
to be modified. Channel transmission is aborted and idle characters (‘1’s) are sent. The host can now
modify the parameters (see Section 2.14, “QH Parameters Initialization Summary,” for parameter
initialization). In HDLC mode, an HDLC abort pattern is sent.
Note
: As long as the B2 channel is running, the D-channel parameters will remain in their swapped
position.
RESTART
TX
RESTART
TX
initiates transmission on the channel following a
STOP
TX
command or an underrun error.
The channel is now considered running (prohibiting parameter modification), and the first Tx buffer
descriptor is polled.
ENTER
HUNT
MODE
ENTER
HUNT
MODE
is generally used to abort reception of the current frame and restart reception of
the next frame. It is the same as in the 302.
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