DESCRIPTION OF PIN FUNCTIONS

PIN NO.

NAME

SYMBOL

TYPE

 

DESCRIPTION

 

 

 

 

 

125

AUI Collision

COLP

Diff. Input

AUI collision differential inputs. A collision is

126

 

COLN

 

indicated by a 10 MHz signal at this input pair.

 

 

 

 

 

121

TPE Receive

TPERXP

Diff. Input

10BASE-T receive differential inputs.

122

 

TPERXN

 

 

 

 

 

 

 

 

4

TPE

TPETXP

Diff. Output

Internal ENDEC - 10BASE-T transmit

6

Transmit

TPETXN

 

differential outputs.

 

 

 

 

 

5

TPE

TPETXDP

Diff. Output

10BASE-T delayed transmit differential

7

Transmit

TPETXDN

 

outputs. Used in combination with TPETXP

 

Delayed

 

 

and TPETXN to generate the 10BASE-T

 

 

 

 

transmit pre-distortion.

 

 

 

 

 

114

Powerdown

PWRDWN

I with pullup

Internal ENDEC - Powerdown input. It keeps

 

 

 

 

the SMC91C95 in powerdown mode when

 

 

 

 

high (open). Must be low for normal operation.

 

 

 

 

Refer to the Powerdown Matrix following for

 

 

 

 

further details.

 

Transmit

TXCLK

 

External ENDEC - Transmit clock input from

 

Clock

 

 

external ENDEC

 

 

 

 

 

 

99

nWakeup

nWAKEUP-

I with pullup

Input.

When pulled down, the device will

 

Enable

EN

 

enable Magic Packet (MP) logic and put the

 

 

 

 

Ethernet function in powerdown mode. The

 

 

 

 

pin assertion will override the state of

 

 

 

 

WAKEUP_EN and PWRDN bits in CTR,

 

 

 

 

Pwrdwn bit in ECSR, and Enable Function bit

 

 

 

 

ECOR. When deasserted, the WAKEUP_EN

 

 

 

 

and PWRDN bits will be changed to (0),

 

 

 

 

Pwrdwn to (0), and Enable Function to (1).

 

 

 

 

 

 

100

Wakeup

WAKEUP

O4

Output.

Asserted high if nWAKEUP_EN is

 

 

 

 

asserted and a valid Magic Packet (MP)

 

 

 

 

pattern is detected. The pin remains asserted

 

 

 

 

until nWAKEUP_EN is deasserted.

 

 

 

 

 

118

Bias

RBIAS

Analog Input

A 22 kohm 1% resistor should be connected

 

Resistor

 

 

between this pin and analog ground.

 

 

 

 

 

 

 

 

 

16

 

 

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SMC Networks SMC91C95 manual Tperxn TPE Tpetxp, TPE Tpetxdp, Txclk