DP83916 datasheet(46/96 Pages) NSC

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50 Bus Interface (Continued)

TABLE 5-1 Pin Description

(Continued)

Symbol

Driver

Direction

Description

Type

NETWORK INTERFACE PINS

(Continued)

RXDo

This pin will be TRI-STATE until the DCR has been written to (See section 432

EXBUS for more information)

RXDi

Receive Data Output (RXDo)

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

EXUSR0

TRI

O Z

When EXT e 0 the RXDOUT 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-16 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 432) this

pin becomes a programmable output It will remain TRI-STATE until the SONIC-16

becomes a bus master at which time it will be driven according to the value

programmed in the DCR2 (Section 437)

RXCo

This pin will be TRI-STATE until the DCR has been written to (See section 432

EXBUS for more information)

RXCi

Receive Clock Output (RXCo)

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

EXUSR1

TRI

O Z

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

is the separated receive clock 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-16 it is also provided as an output to the user

Receive Clock Input (RXCi)

from an external ENDEC (EXT e 1) The separated

received clock from the Manchester data stream This signal is generated from an

external ENDEC

Extended User Output (EXUSR1)

When EXBUS has been set (see section 432) this

pin becomes a programmable output It will remain TRI-STATE until the SONIC-16

becomes a bus master at which time it will be driven according to the value

programmed in the DCR2 (Section 437)

TXD

This pin will be TRI-STATE until the DCR has been written to (See section 432

EXBUS for more information)

EXUSR3

TRI

O Z

Transmit Data (TXD)

The serial NRZ data from the MAC unit which is to be decoded

by an external ENDEC Data is valid on the rising edge of TXC Although this signal is

used internally by the SONIC-16 it is also provided as an output to the user

Extended User Output (EXUSR3)

When EXBUS has been set (see section 432) this

pin becomes a programmable output It will remain TRI-STATE until the SONIC-16

becomes a bus master at which time it will be driven according to the value

programmed in the DCR2 (Section 437)

TXE

Transmit Enable

This pin is driven high when the SONIC-16 begins transmission and

remains active until the last byte is transmitted Although this signal is used internally by

the SONIC-16 it is also provided as an output to the user

TXCo

TRI

O Z

This pin will be TRI-STATE until the DCR has been written to (See section 432

EXBUS for more information)

TXCi

Transmit Clock Output (TXCo)

from the internal ENDEC (EXT e 0) This 10 MHz

STERM

clock transmit clock output is derived from the 20 MHz oscillator When EXT e 0 the

TXCOUT signal is internally connected between the ENDEC and MAC units Although

this signal is used internally by the SONIC-16 it is also provided as an output to the user

Transmit Clock Input (TXCi)

(EXT e 1) This input clock from an external ENDEC is

used for shifting data out of the MAC unit serializer This clock is nominally 10 MHz

Synchronous Termination (STERM)

When the SONIC-16 is a bus master it samples

this pin before terminating its memory cycle This pin is sampled synchronously and may

only be used in asynchronous bus mode when BMODE e 1 See section 545 for more

details

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