DP83936AVF datasheet(6/104 Pages) NSC

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20 Pin Description (Continued)

TABLE 2-1 Pin Description

(Continued)

Symbol

Driver

Direction

Description

Type

NETWORK INTERFACE PINS

(Continued)

CDa

AUI COLLISION a

The positive differential collision input from the transceiver This pin should

be unconnected when an external ENDEC is selected (EXT e 1)

CDb

AUI COLLISION b

The negative differential collision input from the transceiver This pin should

be unconnected when an external ENDEC is selected (EXT e 1)

RXa

AUI RECEIVE a

The positive differential receive data input from the transceiver This pin should

be unconnected when an external ENDEC is selected (EXT e 1)

RXb

AUI RECEIVE b

The negative differential receive data input from the transceiver This pin

should be unconnected when an external ENDEC is selected (EXT e 1)

TXa

ECL

AUI TRANSMIT a

The positive differential transmit output to the transceiver This pin should be

unconnected when an external ENDEC is selected (EXT e 1)

TXb

ECL

AUI TRANSMIT b

The negative differential transmit output to the transceiver This pin should

be unconnected when an external ENDEC is selected (EXT e 1)

CRSo

CARRIER SENSE OUTPUT (CRSo)

from the internal ENDEC (EXT e 0) When EXT e 0 the

CRSo signal is internally connected between the ENDEC and MAC units It is asserted on the first

CRSi

valid high-to-low transition in the receive data (RXg) This signal remains active 15 bit times

after the last bit of data Although this signal is used internally by the SONIC-T it is also provided

as an output to the user

CARRIER SENSE INPUT (CRSi)

from an external ENDEC (EXT e 1) The CRSi signal is

activated high when the external ENDEC detects valid data at its receive inputs

COLo

COLLISION OUTPUT (COLo)

from the internal ENDEC (EXT e 0) When EXT e 0 the COLo

signal is internally connected between the ENDEC and MAC units This signal generates an

COLi

active high signal when the 10 MHz collision signal from the transceiver is detected Although this

signal is used internally by the SONIC-T it is also provided as an output to the user

COLLISION DETECT INPUT (COLi)

from an external ENDEC (EXT e 1) The COLi signal is

activated from an external ENDEC when a collision is detected This pin is monitored during

transmissions from the beginning of the Start of Frame Delimiter (SFD) to the end of the packet

At the end of transmission this signal is monitored by the SONIC-T for CD heartbeat

RXDo

This pin will be TRI-STATE until the DCR has been written to (See Section 642

RXDi

EXBUS for more information)

EXUSR0

TRI

O Z

RECEIVE DATA OUTPUT (RXDo)

from the internal ENDEC (EXT e 0) NRZ data output When

EXT e 0 the RXDo signal is internally connected between the ENDEC and MAC units This

signal must be sampled on the rising edge of the receive clock output (RXCo) Although this

signal is used internally by the SONIC-T it is also provided as an output to the user

RECEIVE DATA INPUT (RXDi)

from an external ENDEC (EXT e 1) The NRZ data decoded

from the external ENDEC This data is clocked in on the rising edge of RXCi

EXTENDED USER OUTPUT (EXUSR0)

When EXBUS has been set (see Section 642) this pin

becomes a programmable output It will remain TRI-STATE until the SONIC-T becomes a bus

master at which time it will be driven according to the value programmed in the DCR2 (see

Section 647)

RXCo

This pin will be TRI-STATE until the DCR has been written to (See Section 642

RXCi

EXBUS for more information)

EXUSR1

TRI

O Z

RECEIVE CLOCK OUTPUT (RXCo)

from the internal ENDEC (EXT e 0) When EXT e 0 the

RXCo signal is internally connected between the ENDEC and MAC units This signal is the

receive clock that is derived from the Manchester data stream It remains active 5-bit times after

the deassertion of CRSo Although this signal is used internally by the SONIC-T it is also provided

as an output to the user

RECEIVE CLOCK INPUT (RXCi)

from an external ENDEC (EXT e 1) The receive clock that is

derived from the Manchester data stream This signal is generated from an external ENDEC

EXTENDED USER OUTPUT (EXUSR1)

When EXBUS has been set (see Section 642) this pin

becomes a programmable output It will remain TRI-STATE until the SONIC-T becomes a bus

master at which time it will be driven according to the value programmed in the DCR2 (see

Section 647)

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