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| 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)： | 65/218頁(yè) |
| 文件大?。?/td> | 521K |
| 代理商： | MC68SC302 |
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Communications Processor (CP)
MOTOROLA
MC68SC302 USER’S MANUAL
4-19
The BD table forms a circular queue with a programmable length. The user can program the
start address of each transmit channel BD table in the internal memory. The user is allowed
to allocate the parameter area of an unused channel to the other used channels as BD
tables or as actual buffers.
The format of the transmit BDs is the same for each SCC mode of operation - HDLC and
Transparent. The first word in each BD determines the data length referenced to this BD and
contains status and control bits. Only this field (containing the status and control bits) differs
for each protocol. The second word in the BD contain the 16-bit address pointer that points
to the actual buffer in memory.
Figure 4-5. Transmit BD
For frame-oriented protocols, a message may reside in as many buffers as necessary. The
CP does not assume that all buffers of a single frame are currently linked to the BD table; it
does assume, however, that the unlinked buffers will be provided by the host in time to be
transmitted. Failure to do so will result in an underrun error being reported by the CP.
The CP processes the transmit BDs in a straightforward fashion. Once the transmit side of
an SCC is enabled, it starts with the first BD in that SCC's transmit BD table, periodically
checking a bit to see if that BD is “ready”. Once it is ready, it will process that BD, reading a
word at a time from its associated buffer, doing certain required protocol processing on the
data, and moving resultant data to the SCC transmit FIFO. When the first buffer has been
processed, the CP moves on to the next BD, again waiting for that BD's “ready” bit to be set.
Thus, the CP does no look-ahead BD processing, nor does it skip over BDs that are not
ready. When the CP sees the “wrap” bit set in a BD, it goes back to the beginning of the BD
table, after processing of this BD is complete. After using a BD, the CP sets the “ready” bit
to not-ready; thus, the CP will never use a BD twice until the BD has been confirmed by the
host.
4.5.4 SCC Receive Buffer Descriptors
For each SCC, the user can allocate a memory chunk in the Dual Port RAM, with a
programmable length. This chunk will include the receive BDs and the receive buffers.
Each BD is followed by its buffer, and the next BD is written right after that when opened, so
there is no wasted space when buffers are closed earlier then expected, or when buffers are
not used.
Figure 4-7. Receive BD
15
0
STATUS and CONTROL
DATA LENGTH
OFFSET + 0
OFFSET + 2
DATA BUFFER POINTER
15
0
STATUS and CONTROL
DATA LENGTH
OFFSET + 0
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