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AM79C98PC Datenblatt(PDF) 6 Page - Advanced Micro Devices |
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AM79C98PC Datenblatt(HTML) 6 Page - Advanced Micro Devices |
6 / 22 page 6 Am79C98 PIN DESCRIPTION AV DD Analog Power This pin supplies +5 V to analog portions of the TPEX circuitry. AV SS Analog Ground This pin is the ground reference for analog portions of the TPEX circuitry. CI+, CI– Control In Output AUI port differential driver. DI+, DI– Data In Output AUI port differential driver. DO+, DO– Data Out Input AUI port differential receiver. DV DD Digital Power This pin supplies +5 V to digital portions of the TPEX circuitry. DV SS Digital Ground This pin is the ground reference for digital portions of TPEX circuitry. LNKST Link Status Open Drain, Input/Output When this pin is tied LOW, the internal Link Test Receive function is disabled and the Transmit and Re- ceive functions will remain active irrespective of arriv- ing idle Link Test pulses and data. TPEX continues to generate idle Link Test pulses irrespective of the status of this pin. As an output, this pin is driven LOW if the link is identi- fied as functional. However, if the link is determined to be nonfunctional, due to missing idle Link Test pulses or data packets, then this pin is not driven. In the LOW output state, the pin is capable of sinking a maximum of 16 mA and can be used to drive an LED. This pin is internally pulled HIGH when inactive. PRDN/RST Power Down/Reset Input, Active LOW Driving this input LOW resets the internal logic of TPEX and places the device in a special Power Down mode. In the Power Down/Reset mode, all output drivers are placed in their inactive state. RCV Receive Output This pin is driven HIGH while TPEX is receiving data on the RXD pins and is transferring the received signal onto the AUI DI pair. The RCV and XMT pins are simul- taneously driven HIGH during collision. REXT External Resistor Input An external precision resistor is connected between this pin and AV DD in order to provide a voltage refer- ence for the internal voltage-controlled oscillator (VCO). RXD+, RXD– Receive Data Input 10BASE-T port differential receivers. RXPOL Receive Polarity Open Drain, Input/Output The twisted-pair receiver is capable of detecting a re- ceive signal with reversed polarity (wiring error). The RXPOL pin is normally in the LOW state, indicating cor- rect polarity of the received signal. If the receiver de- tects reversed polarity, then this pin is not driven (goes HIGH) and the polarity of subsequent packets is in- verted. In the LOW output state, this pin can sink up to a maximum of 16 mA and is therefore capable of driv- ing an LED. This feature can be disabled by strapping this pin LOW. In this case, the Receive Polarity correction circuit is disabled and the internal receive signal remains non- inverted, irrespective of the received signal. This pin is internally pulled HIGH when inactive. SQE TEST Signal Quality Test (Heartbeat) Enable Input, Active LOW The SQE Test function is enabled by tying this input LOW. This input is internally pulled HIGH when inactive. |
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Ähnliche Beschreibung - AM79C98PC |
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