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PDF AM79C988A Data sheet ( Hoja de datos )
| Número de pieza | AM79C988A | |
| Descripción | Quad Integrated Ethernet Transceiver (QuIET) | |
| Fabricantes | Advanced Micro Devices | |
| Logotipo |  |
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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
1 page  
LOGIC DIAGRAM
LOGIC SYMBOL
Pseudo Attachment
Unit Interface
(PAUI) Ports
(4 Ports)
PRELIMINARY
PAUI
Ports
TP
PAUI
TP
PAUI
TP
PAUI
TP
Serial
Interface
DVDD
PDO
PDI
PCI
AVDD
TXD+
TXD-
RXD+
RXD-
Am79C988A
CLK
RST
DVSS
SDATA
DIR
AVSS
19880B-3
Twisted
Pair Ports
(4 Ports)
Serial
Management
Interface
19880B-4
Am79C988A
5
5 Page 
PRELIMINARY
CMOS/PAUI Mode Selection
This command sets the QuIET interface drivers (PDO,
PDI, PCI) to be driven at normal PAUI signal levels or
CMOS voltage levels. The default is PAUI levels. Refer
to the DC Characteristics table for voltage levels.
K 0 CMOS Levels
1 PAUI Levels
Reset Function
The QuIET device enters the reset state when the reset
pin (RST) is held LOW. All ports, status registers, and
command registers are put into their default state.When
powering up the device, the RST pin should be held
LOW for 150 microseconds (µs). At other times, the RST
pin should be held LOW for a minimum of 4 µs. The
default conditions are detailed below.
Command and Status Default Conditions
Command
Extended Distance
Link Test
Link Pulse Transmit
Correct Polarity
Loopback Test
Transceiver Mode Selection
CMOS/PAUI Mode
Default
Disabled
Enabled
Enabled
Disabled
Disabled
Normal
PAUI Mode
Status
Device
Link
Polarity
Jabber
Default
QuIET
Fail
Correct
No Error
Am79C988A
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AM79C988A.PDF ] | |
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