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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)： | 86/218頁(yè) |
| 文件大?。?/td> | 521K |
| 代理商： | MC68SC302 |
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Communications Processor (CP)
4-40
MC68SC302 USER’S MANUAL
MOTOROLA
Transmission Errors:
1. Transmitter Underrun—When this error occurs, the channel terminates buffer trans-
mission, closes the buffer, sets the underrun (UN) bit in the BD, and generates the
TXE interrupt (if enabled). The channel resumes transmission after the reception of
the RESTART TRANSMIT command. Underrun can occur after a transmit frame for
which the L bit in the TxBD was not set. In this case, only the TXE bit is set. The FIFO
size is four words in transparent mode.
2. GRANT Lost During Message Transmission—When this error occurs and the channel
is programed to be the D-channel and is not programmed to control this line with soft-
ware, the channel terminates buffer transmission, closes the buffer, sets the GRANT
lost (COL) bit in the BD, and generates the TXE interrupt (if enabled). The channel will
resume transmission after the reception of the RESTART TRANSMIT command.
Reception Errors:
1. Overrun Error—The transparent controller maintains an internal three-word FIFO for
receiving data. If a FIFO overrun occurs, the transparent controller writes the received
data word to the internal FIFO over the previously received word. The previous word
is lost. Next, the channel closes the buffer, sets the overrun (OV) bit in the BD, and
generates the RX interrupt (if enabled). The receiver then enters hunt mode immedi-
ately.
2. Busy Condition—If the RISC controller tries to move a word to the Rx channel chunk
which is full, the busy condition is encountered. No data is received and the current
RxBD is NOT closed! After the host reads the chunk and frees space for the channel,
the user should issue the ENTER HUNT MODE command.
4.5.11.7 TRANSPARENT RECEIVE BUFFER DESCRIPTOR (RXBD).
The CP reports
information about the received data for each buffer using BD. The RxBD is shown in Figure
4-13. The CP closes the current buffer, generates a maskable interrupt, and starts to receive
data into the next buffer after one of the following events:
Detecting an overrun error.
Detecting a full receive buffer
Issuing the ENTER HUNT MODE command
Figure 4-13. Transparent Receive Buffer Descriptor
The first word of the RxBD contains control and status bits, and also the data length.
E—Empty
0 = The data buffer associated with this BD has been filled with received data, or data
reception has been aborted due to an error condition. The host is free to examine
or write to any fields of this BD.
1 = The data buffer associated with this BD is empty. This bit signifies that the BD and
its associated buffer are available to the CP. The host should not write to any fields
15
E
14
-—
13
-—
12
-—
11
-—
10
-—
9
8
7
6
5
4
3
2
1
0
OV
-—
DATA LENGTH
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