80221 datasheet(7/91 Pages) LSI

7 / 91 page

80220/80221

4-7

MD400159/E

PLED0

I/O

(MDA0)

Pullup

TRFADJ1

Twisted Pair Output Rise/Fall Time adjust Input. These digital inputs adjust the

TRFADJ0

Pullup

rise/fall time on the TPO

± outputs.

Pulldown

11 = Rise/Fall Time Changed -0.25 nS

10 = Rise/Fall Time Changed in MI Serial Port (Default = 0.0 nS)

01 = Rise/Fall Time Changed +0.25 nS

00 = Rise/Fall Time Changed +0.50 nS

RX_EN/

Receive Enable Input

JAM

1 = All Outputs Enabled

0 = Receive Controller Outputs are High Impedance

(RX_CLK, RXD[3:0], RX_DV, RX_ER, COL).

Automatic Jam Input

1 = Normal

0 = Jam Packet Transmitted when Receive Activity Detected

—

PLED5

Receive LED Output. The function of this pin is to be a Receive

O.D.

Activity Detect output and this pin can drive an LED from VCC.

Pullup

1 = No Receive Activity

0 = Receive Packet Occurred, Hold Low for 100 mS

—

PLED4

Transmit LED Output. The function of this pin is to be a Transmit

O.D.

Activity Detect output and this pin can drive an LED from VCC.

Pullup

1 = No Transmit Activity

0 = Transmit Packet Occurred, Hold Low for 100 mS

—

T4ADV

100Base-T4 AutoNegotiation Advertise Input. This input causes the AutoNegotiation

Pulldown algorithm to advertise 100Base-T4 as one of the operating modes.

1 = Advertise 100Base-T4 Capability During AutoNegotiation

0 = No Advertise

—

T4OE

100Base-T4 Output Enable. This output indicates that the AutoNegotiation algorithm

has selected 100Base-T4 as the operating mode and can be used to enable and external

100Base-T4 PHY. When asserted, the TP outputs are high impedance.

—

RPTR

Repeater Mode Enable Input.

Pulldown

1 = Repeater Mode Enabled

0 = Normal Operation

Pin#

I/O

Description

44L 64L

Name

Pin Description continued

Programmable LED Output/Management Interface Address Input. The default

function of this pin is to be a 10 Mbps Link Detect output. This pin can also be

programmed through the MI serial port to indicate other events or be user controlled.

This pin can drive an LED from both VCC and GND.

When programmed as 10 Mbps Link Detect Output (default):

1 = No Detect

0 = 10 Mbps Link Detected

During powerup or reset, this pin is high impedance and the value on this pin is latched

in as the address MDA0 for the MI serial port.

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