|Category||Interface and Interconnect|
|Description||Ieee 802.3/ethernet/cheapernet Transceiver|
|Company||Advanced Micro Devices, Inc.|
|Datasheet||Download AM7996DC datasheet
s Compatible with Ethernet Version 2 and IEEE 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
The Am7996 IEEE 802.3/Ethernet/Cheapernet Transceiver suppor ts Ethernet Version 2, IEEE 802.3 10BASE-5 and IEEE 802.3 10BASE-2--Cheapernet) transceiver applications. Transmit, receive, and collision 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 attachment unit interface (AUI) cable. In IEEE 802.3 10BASE-2--Cheapernet applications, the Am7996 typically resides inside the DTE with its signals to the DTE isolated 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 excessively. While transmitting, collisions on the media are detected 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.
Carrier Detect Circuit DI+ DI Line Driver Control Logic Receive Data Amplifier Collision Detect Circuit Line Driver Control Logic Jabber Timer SQE Test Generator Input Buffer
Part No. Am79C970 Am79C974 Description Twisted Pair Ethernet Transceiver (TPEX) Twisted Pair Ethernet Transceiver Plus (TPEX+) Integrated Multiport Repeater PlusTM (IMR+TM) Hardware Implemented Management Information BaseTM (HIMIBTM) Media Access Controller for Ethernet (MACETM) CMOS Local Area Network Controller for Ethernet (C-LANCE) Integrated Local Area Communications ControllerTM (ILACCTM) PCnet-ISA Single-Chip Ethernet Controller (for ISA bus) PCnet-ISA+ Single-Chip Ethernet Controller (with Microsoft® Plug n' Play® Support) PCnet-32 Single-Chip 32-Bit Ethernet Controller (for 386DX, 486 and VL buses) PCnet-PCI Single-Chip Ethernet Controller (for PCI bus) PCnet-SCSI Combination Ethernet and SCSI Controller for PCI Systems
VCC1 CI+ CI DI+ DI VCREF SQE^TEST DO+ DO VEE VCC2 COLL OSC VCOL NC RXT NC TAP SHIELD VTX TXT VTX+ DI+ DI VCREF SQE^TEST DO+ CI+ VCC1 VCC2 CI
AMD standard products are available in several packages and operating ranges. The order number (valid combination) is formed by a combination of the elements below.OPTIONAL PROCESSING Blank = Standard Processing B = Burn-In TR = Tape and Reel Packaging
PACKAGE TYPE = 20-Pin Plastic DIP (PD = 20-Pin Ceramic DIP (CD = 20-Pin Plastic Leaded Chip Carrier (PL 020) SPEED Not Applicable DEVICE NUMBER/DESCRIPTION Am7996 IEEE 802.3/Ethernet/Cheapernet Transceiver
Valid Combinations Valid combinations list configurations planned to be supported in volume for this device. Consult the local AMD sales office to confirm availability of specific valid combinations and to check on newly released combinations.
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