AM79C985JC datasheet(24/48 Pages) AMD

24 / 48 page

Am79C985

PRELIMINARY

Figure 8. Port Activity Signals with Am79C987 HIMIB Device

Management Commands

The following section details the operation of each

management commands available in the eIMR+ de-

vice. In all cases, the individual bits in each command

are shown with the most-signiﬁcant bit (bit 7) on the left

and the least-signiﬁcant bit (bit 0) on the right. Table 5

and Table 6 show a summary of default states and a

summary of management commands, respectively.

Note: Data is transmitted and received on the serial

data lines least-signiﬁcant bit ﬁrst and most-signiﬁcant

bit last.

CRS

One eIMR+ Device

T0 T1 T2 T3 T4 T5 T6 T7

T4 T5 T6 T7

T0 T1 T2 T3

TCLK

CRS

Secondary

CRS

Primary*

CLK

Shows actual output stream to secondary device.

20651B-13

Table 5. Summary of Default States after Reset

eIMR+ Programmable Option—

CSA

Off

AUI Partitioning Algorithm

Normal

TP Partitioning Algorithm

Normal

AUI/TP Port

Enabled

Link Test

Enabled

Link Pulse

Enabled

Automatic Receiver Polarity

Reversal

State of SI at reset

Extended Distance Mode

Disabled

Blink Rate

Off

Software Override of LEDs

Disabled

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