ThunderLAN

™ TNETE100

PCI ETHERNET

™ CONTROLLER

SINGLE-CHIP 10 BASE-T WITH MII FOR 100 BASE-T/100VG-AnyLAN

™

SPWS017B – APRIL 1995 – REVISED AUGUST 1996

8

POST OFFICE BOX 1443

Pin Functions (Continued)

PIN

TYPE†

DESCRIPTION

NAME

NO.

TYPE†

DESCRIPTION

MEDIA-INDEPENDENT INTERFACE (100-Mbps CSMA / CD AND DEMAND PRIORITY) (CONTINUED)

MRXD0

MRXD1

MRXD2

MRXD3

83

85

86

87

I

Receive data. MRXD[3 : 0] is the nibble that receives data from the physical-media-dependent (PMD)

front end. In demand-priority mode, ThunderLAN reads the frame priority of incoming frames on these

pins on the cycle before assertion of MRXDV (the cycle before frame reception begins).

• MRXD1 indicates the transmission priority of the received frame. A value of zero indicates

normal transmission, and a value of one indicates priority transmission.

Data on these pins is always synchronous to MRCLK.

MRXDV

89

I

Receive data valid. MRXDV indicates data on MRXD[3 : 0] is valid.

MRXER

90

I

Receive error. MRXER indicates reception of a coding error on received data.

MTCLK

71

I

Transmit clock. MTCLK is the transmit clock source from the attached PHY and PMI device.

MTXD0

MTXD1

MTXD2

MTXD3

72

73

74

76

O

Transmit data. MTXD[3 : 0] is the nibble that transmits data from TNETE100. When MTXEN is asserted,

these pins carry data to be transmitted. In demand-priority mode, the TNETE100 drives the request

state of the adapter on these pins when MTXEN is not asserted (frame transmission not in progress).

• MTXD0 asserted indicates the TNETE100 is requesting frame transmission.

• MTXD1 indicates the transmission priority required. A value of zero indicates normal

transmission, and a value of one indicates high-priority transmission.

Data on these pins is always synchronous to MTCLK.

MTXER

78

O

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

MTXEN

77

O

Transmit enable. MTXEN indicates valid transmit data on MTXD[3 : 0].

NETWORK INTERFACE (10 Base-T AND AUI)

ACOLN

ACOLP

111

109

A

AUI receive pair. ACOLN and ACOLP are differential line receiver inputs and connect to receive pair

through transformer isolation, etc.

ARCVN

ARCVP

108

106

A

AUI receive pair. ARCVN and ARCVP are differential line receiver inputs and connect to receive pair

through transformer isolation, etc.

AXMTP

AXMTN

99

100

A

AUI transmit pair. AXMTP and AXMTN are differential line transmitter outputs.

FATEST

118

A

Analog test pin. FATEST provides access to the filter of the reference PLL. This pin should be left as

a “no connect.”

FIREF

116

A

Current reference. FIREF is used to set a current reference for the analog circuitry.

FONLY

120

A

Front-end only pin. When FONLY is tied high, all TNETE100 functions other than the on-chip front end

are disabled. The MII interface pins allow the PHY to be used as a stand-alone 10 Base-T front end.

FRCVN

FRCVP

105

103

A

10 Base-T receive pair. FRCVN and FRCVP are differential line receiver inputs and connect to receive

pair through transformer isolation, etc.

FXTL1

FXTL2

113

114

A

Crystal oscillator pins. Drive FXTL1 from a 20-MHz crystal oscillator module

FXMTP

FXMTN

97

98

A

10 Base-T transmit pair. FXMTP and FXMTN are differential line transmitter outputs.

† I = input, O = output, A = Analog