AM79C988数据手册AMD中文资料规格书

描述 Description

GENERAL DESCRIPTION
The Am79C988A Quad Integrated Ethernet Transceiver (QuIET) device consists of four independent 10BASE-T transceivers which are compliant with the IEEE 802.3 Section 14 (Medium Attachment Unit for 10BASE-T Cabling) standard. When combined with AMD's Integrated Multiport Repeater 2 (IMR2™) chip, the QuIET device provides a system-level solution to designing a managed 10BASE-T repeater.
The QuIET device includes on-chip filtering for both transmit and receive functions, thus eliminating the need for external filters. On-chip filtering meets IEEE 802.3 (Section 14.3) electrical requirements. The QuIET device provides automatic polarity detection and correction and can operate in either normal or full duplex mode.DISTINCTIVE CHARACTERISTICS
■ Four independent 10BASE-T transceivers compliant with IEEE 802.3 Section 14 (10BASE-T MAUs)
■ Direct interface with AMD's Am79C983A IMR2™ repeater device
■ On-chip filtering
   — Eliminates external transmit and receive filters
   — Meets IEEE 802.3 (Section 14.3) electrical requirements
   — Enables port switching when used with the IMR2 device
■ Automatic polarity detection and correction
■ Serial management interface allows transfer of command and status data between the QuIET device and a controller (IMR2 or other device)
■ Standard Ethernet (Normal) and Full-Duplex modes
■ Extended distance option to accommodate lines longer than 100 meters
■ Test functions provided for Loopback, Link Test, Reverse Polarity, and Jabber
■ 44-pin PLCC CMOS device with a single 5-V supply