AM79C988BJC datasheet(10/25 Pages) AMD

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Am79C988A

PRELIMINARY

Link Status

B0B1B2B3

The QuIET device reports the Link Status of each port.

If Link Test is disabled, Link Status indicates a Link Pass.

Link Fail

Link Pass

Receive Polarity Status

C0C1C2C3

The QuIET device reports the polarity status of each port.

Reversed Polarity

True Polarity

Jabber Condition

D0D1D2D3

The QuIET device reports the Jabber Condition status

for each port. Jabber is deﬁned as continuous transmis-

sions by a port for more than 30 ms.

No Jabber

Jabber

Management Commands

When DIR switches from LOW to HIGH, the QuIET de-

vice reads the command sequence over SDATA. Each

management command character is held for 2-bit times

(200 ns). The command format is as follows.

Management Command Format

0E0E1E2E3F0F1F2F3G0G1G2G3H0H1H2H3I J0J1J2J3KSSSSSSS

Note: The QuIET device requires DIR to be high for a

minimum of 29 data bits (one bit is four MCLKs), which

automatically occurs with the IMR2 device. If any other

type of controller is used, DIR must still be high at least

29-bit times. After I, SDATA can be all ones.

Extended Distance Option

E0E1E2E3

This command modiﬁes the RXD circuit of the trans-

ceiver to accommodate signal-attenuation lines longer

than 100 meters.

0 Disable Extended Distance Option

1 Enable Extended Distance Option

Link Test Enable

F0F1F2F3

This command enables the corresponding port to per-

form a Link Test. Link Status will report Link Pass if the

Link Test is disabled.

Disable Link Test

Enable Link Test

Transmit Link Pulse Enable

G0G1G2G3

This command enables the corresponding port to trans-

mit a Link Pulse. The pulse will be transmitted if either

a packet or a pulse has not been transmitted for 16 ms.

Note that Link Pulses are transmitted when ports are in

Link Test Fail.

Disable Link Pulse Transmit

Enable Link Pulse Transmit

Auto Polarity Correction Enable

H0H1H2H3

This command allows the QuIET device to detect and

correct the polarity of signals at RXD.

Enable Auto Polarity

Disable Auto Polarity

Loopback Test Enable

This command enables or disables the loopback test

for the twisted pair ports. When enabled, the signal on

RXD is retransmitted on TXD. The default condition is

loopback test disabled. Note that the TXD drivers have

on-chip ﬁltering, which may cause the TXD output to

be different from the corresponding RXD input during

this test.

Enable Loopback Test

Disable Loopback Test

Transceiver Mode Selection

J0J1J2J3

This command sets the QuIET device either in Full-Du-

plex or Normal mode. The default is Normal mode.

Full Duplex

Normal

Extended Distance

0 Disabled

1 Enabled

Link Test

0 Disabled

1 Enabled

Transmit Link Test Pulses

0 Disabled

1 Enabled

Enable Polarity Correc-

tion

0 Enabled

1 Disabled

Loopback Test (All Ports)

0 Enabled

1 Disabled

Transceiver Mode

0 Full Duplex

1 Normal (Default

condition - IMR2 only

supports Normal)

CMOS/PAUI Mode

0 CMOS Mode

1 PAUI Mode

Not used

Logic HIGH

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