AM79C981 datasheet(13/40 Pages) AMD

13 / 40 page

AMD

PRELIMINARY

1–83

Am79C981

Repeater MAC Interconnection

Because all repeated data in the IMR+ chip or multi-

IMR+ chip design is available on the Expansion Port, all

network traffic can be monitored by an external Media

Access Controller (MAC) device such as the Am7990,

Am79C900, Am79C940, or Am79C960. A repeater with

such a controller is capable of providing extensive hub

management functions, as well as being addressable as

a network node. The MAC device can gather statistics

and data concerning the state of the hub and the

network, and the network addressability allows a remote

management station to monitor this statistical data and

to request actions to be performed by the repeater (i.e.

port enable/disable).

Figure 2 shows how to interface a repeater based on

multiple IMR+ devices to an Ethernet controller such as

the Am79C900 ILACC or the Am7990 LANCE. For more

information on this design, refer to AMD’s IEEE 802.3

Repeater Technical Manual, PID# 17314A.

Am7990 LANCE

Am79C900 ILACC

Am79C940 MACE

Am79C960 PCnet-ISA

IMR+1

RST

IMR+2

RST

ARST

DONE_COUNT

NEW96

TCK

IMR+n

RST

RCKEN

NEW96

DONE_COUNT

CDT

ACKCLK

RTSCLK

Arbiter

PALCE16V8

Interface

PALCE16V8

Counter

PALCE22V10

20 MHz Osc.

14396C-033A

17306B-6

Figure 2. Expandable Modular Repeater

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