AM79C960KC datasheet(75/127 Pages) AMD

75 / 127 page

P R E L I M I N A R Y

AMD

1-417

Am79C960

tMMR3 and tMMW3 are nomi-

nally set to 100 ns.

EADISEL

EADI

Select.

Enables

EADI

match mode. XMAUSEL must be

AWAKE

Auto-Wake. If LNKST is set and

AWAKE = “1”, the 10BASE-T

receive circuitry is active during

sleep and listens for Link Pulses.

LED0 indicates Link Status and

goes active if the 10BASE-T port

comes of out of “link fail” state.

This LED0 pin can be used by ex-

ternal circuitry to re-enable the

PCnet-ISA

controller

and/or

other devices.

When AWAKE = “0”, the Auto-

Wake circuity is disabled. This bit

only has meaning when the

10BASE-T network interface is

selected.

ASEL

Auto Select. When set, the

PCnet-ISA controller will auto-

matically select the operating

media interface port.

Set by

Reset.

XMAUSEL

External MAU Select allows the

hardware selection of AUI or

10BASE-T interfaces when set.

When cleared, the interface is

selected by software. Cleared by

RESET.

ASEL

XMAUSEL

(Bit 1)

(Bit 0)

Selection Mode

Software; interface selection is

done through the PORTSEL[1:0]

bits in CSR15.

Jumper; interface selection is

done through the MAUSEL pin.

Automatic (default)

Reserved

ISACSR4: LED0 Status (Link Integrity)

Bit

Name

Description

ISACSR4 is a non-programma-

ble register that uses one bit to

reflect the status of the

LED0 pin.

This pin defaults to twisted pair

MAU Link Status (LNKST) and is

not programmable.

LNKST

LNKST is a read-only register bit

that indicates whether the Link

Status LED is asserted. When

LNKST is read as zero, the Link

Status LED is not asserted.

When LNKST is read as one, the

Link Status LED is asserted, indi-

cating good 10BASE-T integrity.

14-0

RES

Reserved locations. Written as 0,

read as undefined.

ISACSR5: LED1 Status

Bit

Name

Description

ISACSR5

controls

the

func-

tion(s)

that

the

LED1

displays. Multiple functions can

be simultaneously enabled on

this LED pin. The LED display will

indicate the logical OR of the en-

abled

functions.

ISACSR5

defaults to Receive Status (RCV)

with pulse stretcher enabled

(PSE = 1) and is fully program-

mable.

LEDOUT

Indicates

the

current

(non-

stretched) state of the function(s)

generated. Read only.

14-8

RES

Reserved locations. Read and

written as zero.

PSE

Pulse Stretcher Enable. Extends

the LED illumination for each en-

abled function occurrence.

0 is disabled, 1 is enabled.

6-5

RES

Reserved locations. Read and

written as zero.

XMT E

Enable Transmit Status Signal.

Indicates PCnet-ISA controller

transmit activity .

0 disables the signal, 1 enables

the signal.

RVPOL E

Enable Receive Polarity Signal.

Enables LED pin assertion when

receive polarity is correct on the

10BASE-T port. Clearing the bit

indicates

this

function

be ignored.

RCV E

Enable Receive Status Signal.

Indicates receive activity on the

network.

0 disables the signal, 1 enables

the signal.

JAB E

Enable Jabber Signal. Indicates

the PCnet-ISA controller is jab-

bering on the network.

0 disables the signal, 1 enables

the signal.

COL E

Enable Collision Signal. Indi-

cates collision activity on the

network.

0 disables the signal, 1 enables

the signal.

AM79C960KC Datasheet(PDF) 75 Page - Advanced Micro Devices

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