TNETE2101

10BASE-T/100BASE-TX/100BASE-FX

LOW-POWER PHYSICAL-LAYER INTERFACE

SPWS032D – JANUARY 1997 – REVISED MARCH 1999

6

POST OFFICE BOX 655303

Terminal Functions (Continued)

MII interface (continued)

TERMINAL

TYPE†

I/O

DESCRIPTION

NAME

NO.

TYPE†

I/O

DESCRIPTION

MTXEN

58

5-V TTL

I

Transmit enable. MTXEN indicates valid transmit data on MTXD0–MTXD3. MTXEN is

synchronous to MTCLK.

MTXER

57

5-V TTL

I

Transmit error. MTXER allows coding errors to be propagated across the MII. MTXER is

synchronous to MTCLK.

† 5-V TTL terminals are 5-V tolerant if VDD5 is connected to 5 V.

miscellaneous

TERMINAL

TYPE‡

I/O

DESCRIPTION

NAME

NO.

TYPE‡

I/O

DESCRIPTION

SLINK

(CDEVSEL3)

39

TTL

I/O

Link status. When asserted high, SLINK indicates that a good link has been established with

the link partner. When autonegotiation is enabled, SLINK also indicates that the CSPEED and

CDUPLEX terminals are being driven with the negotiated speed and duplex configuration. The

value of SLINK is latched on the rising edge of MRST for use as CDEVSEL3, bit 3, of the MII

device-select address.

XTAL1

11

A

I

Clock input. XTAL1 is the main 20-MHz reference clock input for the TNETE2101. A 20-MHz

clock oscillator can be connected to XTAL1, or a crystal with a capacitor network can be

connected across XTAL1 and XTAL2.

XTAL2

12

A

O

Output for external crystal circuit. See XTAL1.

‡ A = analog

network interface

TERMINAL

TYPE‡

I/O

DESCRIPTION

NAME

NO.

TYPE‡

I/O

DESCRIPTION

ACT

85

A

O

Center tap. ACT is the connection to the primary center tap of the transmit transformer.

ARCVP

ARCVN

91

92

A

I

Receive pair. ARCVP and ARCVN are the differential line inputs to the device from the transformer

and termination components.

AXMTP

AXMTN

87

88

A

O

Transmit pair. AXMTN and AXMTP are the differential line outputs from the device to the transformer

and termination components.

‡ A = analog

no connection

TERMINAL

DESCRIPTION

NAME

NO.

DESCRIPTION

NC

15, 17, 64, 74, 94, 95, 97, 98

No connection (no external connection allowed).