參數(shù)資料
型號: MB86965A
元件分類: 微控制器/微處理器
英文描述: 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16
封裝: PLASTIC, QFP-160
文件頁數(shù): 48/76頁
文件大?。?/td> 394K
代理商: MB86965A
MB86965
52
TRANSCEIVER
The EtherCoupler’s Transceiver, which is fully com-
pliant with IEEE 802.3 specifications for AUI (Attach-
ment Unit Interface) and 10BASE-T (twisted-pair)
interfaces, provides electrical interface to DB15 (AUI)
and RJ45 (10BASE-T) connections to an Ethernet local
area network. Its functions include Manchester encoding
and decoding of serial data streams, level conversion,
collision detection, signal quality error (SQE) and link
integrity testing, jabber control, loopback, and automatic
correction of polarity reversal on the twisted-pair input.
Pulse-shaping and filtering functions eliminate the need
for external filtering components and thus reduce overall
system cost. Also provided are outputs for receive,
transmit, collision and link test LEDs, and compatibility
with shielded and unshielded twisted-pair cables.
Receive threshold can be reduced to allow an extended
range between nodes in low-noise environments.
TRANSMIT FUNCTION
The Transceiver Transmitter section receives from the
controller section non-return zero (NRZ) data that passes
through a Manchester encoder. Encoded data then
transfers to either the AUI cable via the DO circuit or the
twisted-pair network via the TPO circuit. Advanced
integrated pulse-shaping and filtering produces on the
TPON and TPOP pins an output signal that is
predistorted and prefiltered to meet the 10BASE-T jitter
template, which requires no external filters.
During idle periods, EtherCoupler transmits link
integrity test pulses on the TPO circuit if Link Test Enable
bit, LINK TEST EN, BMPR13<5>, is enabled and the
AUI/TP port-select bit, BMPR13<4> is set low for
twisted-pair (TP) mode. EtherCoupler is programmed for
either shielded (150
) or unshielded (100 )
twisted-pair through STP/UTP bit BMBR13<2>.
Figure 18. Jabber Control Function
(DO = Idle)
XMT=Disable
LBK=Disable
CI=SQE
(DO = Idle)
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