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AM7996 데이터시트(PDF) 1 Page - Advanced Micro Devices |
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AM7996 데이터시트(HTML) 1 Page - Advanced Micro Devices |
1 / 18 page FINAL Publication# 07506 Rev: E Amendment/0 Issue Date: May 1994 1 Am7996 IEEE 802.3/Ethernet/Cheapernet Transceiver DISTINCTIVE CHARACTERISTICS s Compatible with Ethernet Version 2 and IEEE 802.3 10BASE-5 and10BASE-2 specifications s Pin-selectable SQE Test (heartbeat) option s Internal jabber controller prevents excessive transmission time s Noise rejection filter ensures that only valid data is transmitted onto the network s Collision detection on both transmit and receive data s Collision detect threshold levels adjustable for other networking applications GENERAL DESCRIPTION The Am7996 IEEE 802.3/Ethernet/Cheapernet Trans- ceiver suppor ts Ethernet Version 2, IEEE 802.3 10BASE-5 and IEEE 802.3 10BASE-2—Cheapernet) transceiver applications. Transmit, receive, and colli- sion detect functions at the coaxial media interface to the data terminal equipment (DTE) are all performed by this single device. In an IEEE 802.3 (10BASE-5)/Ethernet application, the Am7996 interfaces the coaxial (0.4 ″ diameter) media to the DTE through an isolating pulse transformer and the 78 Ω attachment unit interface (AUI) cable. In IEEE 802.3 10BASE-2—Cheapernet applications, the Am7996 typi- cally resides inside the DTE with its signals to the DTE iso- lated and the coaxial (0.2 ″ diameter) media directly connected to the DTE. Transceiver power and ground in both applications are isolated from that of the DTE. The Am7996’s tap driver provides controlled skew and current drive for data signaling onto the media.The jabber controller prevents the node from transmitting exces- sively. While transmitting, collisions on the media are de- tected if one or more additional stations are transmitting. The Am7996 features an optional SQE Test function that provides a signal on the Cl pair at the end of every transmission. The SQE Test indicates the operational status of the Cl pair to the DTE. It can also serve as an acknowledgment to the node that packet transmission onto the coax was completed. BLOCK DIAGRAM Line Driver Line Driver Transmit Data Amplifier Control Logic Carrier Detect Circuit Receive Data Amplifier Collision Detect Circuit Jabber Timer SQE Test Generator Transmit Squelch Input Buffer SQE TEST DO+ DO– Control Logic Tap Driver TXT Input Buffer CI+ CI– DI+ DI– RXT 07506E-1 |
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