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| 型號(hào)： | ISAC-SPEB2086 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ISDN SUBSCRIBER ACCESS CONTROLLER |
| 中文描述： | ISDN用戶接入控制器 |
| 文件頁(yè)數(shù)： | 114/262頁(yè) |
| 文件大?。?/td> | 3476K |
| 代理商： | ISAC-SPEB2086 |
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ISAC-SX
PEB 3086
Description of Functional Blocks
Data Sheet
114
2003-01-30
A pair of MX and MR in the inactive state for two or more consecutive frames indicates
an
idle state
or an
end of transmission
.
A
start of a transmission
is initiated by the transmitter by setting the MXC bit to ’1’
enabling the internal MX control. The receiver acknowledges the received first byte by
setting the MR control bit to ’1’ enabling the internal MR control.
The internal MX,MR control indicates or acknowledges a new byte in the MON slot by
toggling MX,MR from the active to the inactive state for one frame.
Two frames with the MX-bit in the inactive state indicate the
end of transmission
.
Two frames with the MR-bit set to inactive indicate a receiver request for
abort
.
The transmitter can
delay a transmission
sequence by sending the same byte
continuously. In that case the MX-bit remains active in the IOM-2 frame following the
first byte occurrence. Delaying a transmission sequence is only possible while the
receiver MR-bit and the transmitter MX-bit are active.
Since a
double last-look criterion
is implemented the receiver is able to receive the
MON slot data at least twice (in two consecutive frames), the receiver waits for the
acknowledge of the reception of two identical bytes in two successive frames.
To control this handshake procedure a collision detection mechanism is implemented
in the transmitter. This is done by making a
collision check
per bit on the transmitted
MONITOR data and the MX bit.
Monitor data will be transmitted repeatedly until its reception is acknowledged or the
transmission time-out timer expires.
Two frames with the MX bit in the inactive state indicates the
end of a message
(EOM).
Transmission and reception of monitor messages can be performed simultaneously.
This feature is used by the ISAC-SX to send back the response before the
transmission from the controller is completed (the ISAC-SX does not wait for EOM
from controller).
3.7.3.2
In case the ISAC-SX does not detect identical monitor messages in two successive
frames, transmission is not aborted. Instead the ISAC-SX will wait until two identical
bytes are received in succession.
A transmission is aborted of the ISAC-SX if
an error in the MR handshaking occurs
a collision on the IOM-2 bus of the MONITOR data or MX bit occurs
the transmission time-out timer expires
Error Treatment
A reception is aborted by the device if
an error in the MX handshaking occurs or
an abort request from the opposite device occurs
相關(guān)PDF資料 |
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| ISAC-SX | ISDN SUBSCRIBER ACCESS CONTROLLER |
| ISAC-SXPEB3086 | ISDN SUBSCRIBER ACCESS CONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISAC-SX | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ISDN SUBSCRIBER ACCESS CONTROLLER |
| ISAC-SXPEB3086 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ISDN SUBSCRIBER ACCESS CONTROLLER |
| ISA-HUB-KT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ISA-HUB-KT - Evaluation Kit for the Am79C981 and Am79C987 Devices |
| ISAM250000R1012 | 制造商:ABB Control 功能描述:MOTOR STARTER MS116-12 |
| ISANET-EVAL-KT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ISAnet-EVAL-KT - PCnet-ISA II Based Shared Memory Evaluation Platform |
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