AM79C983A Datasheet PDF | Advanced Micro Devices

Advanced Micro Devices AM79C983A

The Am79C983A Integrated Multiport Repeater 2 (IMR2) chip is a VLSI integrated circuit that provides a system-level solution to designing intelligent (managed) multiport repeaters. When the IMR2 device is combined with the Quad Integrated Ethernet Transceiver (QuIET) device, it provides a cost-effective solution to designing 10BASE-T managed repeaters. The IMR2 device integrates the repeater functions speciﬁed by Section 9 (Repeater Unit) and Section19 (Layer Management for 10 Mb/s Baseband Repeaters) of the IEEE 802.3 standard.

Part No.	AM79C983A
Datasheet	AM79C983A Download
Manufacturer	Advanced Micro Devices
Description	Integrated Multiport Repeater-2
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GENERAL DESCRIPTION

The Am79C983A IMR2 device provides 1 standard Attachment Unit Interface (AUI) port, 12 Pseudo Attachment Unit Interface (PAUI) por ts, and 1 Reversible AUI (RAUI) port for direct connection to a media access controller (MAC). The pseudo AUI ports can be connected to external transceivers to support multiple media types, including 10BASE2, 10BASE-T, and 10BASE-FL/FOIRL. The pseudo AUI ports can be turned off individually (without external circuitry) to allow the switching of transceiver ports between IMR2 devices. This capability allows multiple IMR2 devices to be connected to a single set of transceivers, thus allowing straightforward implementations of port switching applications. The IMR2 device also provides a Hardware Implemented Management Information Base (HIMIB™), which is a super set of the functions provided by the Am79C987 HIMIB device. All of the necessar y counters, attributes, actions, and notiﬁcations speciﬁed by Section 19 of the IEEE 802.3 standard are included in the IMR2 device.