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參數資料
| 型號： | W6691 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | ISDN S/T Interface Transceiver |
| 中文描述： | 綜合業務數字網的S / T接口收發器 |
| 文件頁數： | 51/106頁 |
| 文件大?。?/td> | 428K |
| 代理商： | W6691 |
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Preliminary W6691
Publication Release Date: Sep 2001
51 Revision 1.1
The relevant status bits are:
For the reception of Monitor data: MDR (Monitor Channel Data Received )
MER (Monitor Channel End
of Reception)
For the transmission of Monitor data: MDA (Monitor Channel Data Acknowledged )
MAB (Monitor
Channel Data Abort)
About the status bit MAC( Monitor Channel Transmit Active) indicates whether a transmission is progress
.
If set MAC = 0,
the previous transmission has been terminated. Before starting a transmission, the
microprocessor should verify that the transmitter is inactive.
If set MAC = 1, after having written data into the Monitor Transmit Channel (MOX) register, the
microprocessor sets this bit to 1. This enables the “A” bit to go active (0), indicating the presence of valid
Monitor data (contents of MOX) in the corresponding frame.
The receiving device stores the Monitor byte in its MOR (Monitor Receive Channel) and generates a MDR
(Monitor Channel Data Receive) interrupt status. Alerted by the MDR interrupt, the microprocessor reads the
MOR register. When it is ready to accept data, it sets the “E” control bit MRC to 1 to enable the receiver to
store succeeding Monitor channel bytes and acknowledge them according to the Monitor channel protocol. In
addition, it enables other Monitor channel interrupts by setting Monitor Channel Interrupt Enable to 1.
The first Monitor channel byte is acknowledged by the receiving device setting the “E” bit to 0. This causes a
MDA (Monitor Channel Data Acknowledge) interrupt status at the transmitter. A new Monitor channel data byte
can now be written by the microprocessor in MOX register. The “A” bit is still in the active (0) state. The
transmitter indicates a new byte in the Monitor channel by returning the “A” bit active after sending it once in
the inactive state. The receiver stores the Monitor channel byte in MOR register and generates a new MDR
interrupt status. When the microprocessor has read the MOR register , the receiver acknowledges the data by
returning the “E” bit active after sending it once in the inactive state. This in turn causes the transmitter to
generate a MDA interrupt status. This
″
MDA interrupt
interrupt
″
handshake procedure is repeated as long as the transmitter has data to send.
When the last byte has been acknowledged by the receiver (MDA interrupt status), the microprocessor sets
the Monitor channel Transmit Control bit MXC to 0. This enforces an inactive (1) state in the “A” bit. Two
frames of “A” inactive signifies the end of a message. Thus, a MER (Monitor channel End of Reception)
interrupt status is generated by the receiver when the “A” bit is received in the inactive state in two consecutive
frames. As a result, the microprocessor sets the “E” bit control bit MRC to 0, which in turn enforces an inactive
state in the “E” bit. This marks the end of the transmission, making the MAC (Monitor channel Active) bit return
to 0.
During a transmission process, it is possible for the receiver to ask a transmission to be aborted by sending
an inactive “E” bit value in two consecutive frames. This is effected by the microprocessor writing the “E” bit
control bit MRC to 0. An aborted transmission is indicated by a MAB (Monitor Channel Data Abort) interrupt
write data
MDR interrupt
read data
MDA
相關PDF資料 |
PDF描述 |
|---|---|
| W6691CD | ISDN S/T Interface Transceiver |
| W6691CP | ISDN S/T Interface Transceiver |
| W6692 | PCI Bus ISDN S/T Interface Controller(PCI總線的ISDN S/T接口控制器) |
| W6693A | USB Bus ISDN S/T Interface Controller(USB總線的ISDN S/T接口控制器) |
| W6694 | PCI Bus ISDN S/T Interface Controller(PCI總線的ISDN S/T接口控制器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W66910 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| W66910CD | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TE Mode ISDN S/T-Controller with Microprocessor Interface |
| W6691CD | 制造商:WINBOND 制造商全稱:Winbond 功能描述:ISDN S/T Interface Transceiver |
| W6691CP | 制造商:WINBOND 制造商全稱:Winbond 功能描述:ISDN S/T Interface Transceiver |
| W6692 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:PCI Bus ISDN S/T-Controller |
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