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): 82/218頁(yè)
文件大小: 521K
代理商: MC68SC302
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Communications Processor (CP)
4-36
MC68SC302 USER’S MANUAL
MOTOROLA
TXB—Tx Buffer
A buffer has been transmitted on the HDLC channel. This bit is set no sooner than when
the second-to-last bit of the closing flag begins its transmission, if the buffer is the last in
the frame. Otherwise, it is set after the last byte of the buffer has been written to the trans-
mit FIFO.
RTH/TO—Receiver Threshold or Time Out
The receive memory chunk has been filled with RTHRSH bytes, or the receive memory
chunk has valid data, and the time (measured in RCLK octets) have reached RTO.
4.5.10.11 HDLC MASK REGISTER.
The SCC mask register (SCCM) is referred to as the
HDLC mask register when the SCC is operating as an HDLC controller. It is an 8-bit read-
write register that has the same bit formats as the HDLC event register. If a bit in the HDLC
mask register is a one, the corresponding interrupt in the event register will be enabled. If
the bit is zero, the corresponding interrupt in the event register will be masked. Unused/
reserved bits must be masked. This register is cleared upon reset.
HDLC Mask Register
4.5.11 Transparent Controller
The transparent controller allows transmission and reception of serial data over an SCC
without any modification to that data stream. Transparent mode provides a clear channel on
which no bit-level manipulation is performed by the SCC. Any protocol run over transparent
mode is performed in software. The job of an SCC in transparent mode is to function simply
as a high-speed serial-to-parallel and parallel-to-serial converter. This mode is also referred
to as totally transparent or promiscuous operation.
The SCC in transparent mode can work with IDL, GCI (IOM-2), or NMSI interfaces. When
the SCC in transparent mode is used in NMSI, the SCC outputs are connected directly to
the external pins without any synchronization.
The main transparent controller features are as follows:
Flexible Data Buffers
Internal byte Synchronization from SI
Reverse Data Mode
Interrupts on Buffers Transmitted or Received
Three Commands
4.5.11.1 TRANSPARENT CHANNEL BUFFER TRANSMISSION PROCESSING.
When
the host enables the transparent transmitter, it will start transmitting ones. The transparent
controller then polls the first BD in the transmit channel's BD table approximately every 16
transmit clocks. When there is a buffer to transmit, the transparent controller will fetch the
15
14
13
12
11
10
9
8
SCCM1 AT ADDRESS $88B
GRANT
IDL
TXE
RXF
BSY
TXB
RTH/TO
SCCM2 AT ADDRESS $89B
0
0
0
0
0
0
0
0
SCCM3 AT ADDRESS $8AB
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