AM79C988A Datasheet, PDF (1/25 Pages) Advanced Micro Devices – Quad Integrated Ethernet Transceiver (QuIET™)

PRELIMINARY
Am79C988A
Quad Integrated Ethernet Transceiver (QuIET™)
DISTINCTIVE CHARACTERISTICS
s Four independent 10BASE-T transceivers
compliant with IEEE 802.3 Section 14
(10BASE-T MAUs)
s Direct interface with AMD's Am79C983A IMR2™
repeater device
s 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
s Automatic polarity detection and correction
s Serial management interface allows transfer of
command and status data between the QuIET
device and a controller (IMR2 or other device)
s Standard Ethernet (Normal) and Full-Duplex
modes
s Extended distance option to accommodate
lines longer than 100 meters
s Test functions provided for Loopback, Link Test,
Reverse Polarity, and Jabber
s 44-pin PLCC CMOS device with a single 5-V
supply
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.
The QuIET device interfaces directly with the Pseudo
AUI (PAUI™) ports on the IMR2 (Am79C983A) device
and can also be connected to standard AUI ports. Com-
mand and status data are exchanged with the IMR2
device via a serial management interface. Port switch-
ing can be easily implemented with the IMR2/QuIET
chipset to move individual ports between multiple Ether-
net segments under software control.
For application examples on building fully-managed
repeaters using the QuIET and IMR2 devices, refer to
AMD’s IMR2 Technical Manual (PID 19898A).
The QuIET chip is packaged in a 44-pin plastic leaded
chip carrier (PLCC). The device is fabricated in CMOS
technology and requires a single 5-V supply.
This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed
product without notice.
Publication# 19880 Rev: B Amendment/+2
Issue Date: November 1997