DP83256VF datasheet(103/144 Pages) NSC

103 / 144 page

60 Signal Descriptions (Continued)

Alternate PMD Interface

Symbol

Description

PMIDa

PMD Indicate Data

Differential 100k ECL 125 Mbps serial data input signals from the PMD

Receiver into the Clock Recovery Module (CRM) of the PLAYERa

PMIDb

RXC

OUTa

Recovered Clock Out

125 MHz clock recovered by the Clock Recovery Module (CRM) from the

PMID data input

RXC

OUTb

These signals are only active when the Alternate PMD Enable (APMDEN) bit of the Alternate PMD

When these two pins are not used they should be left Not Connected (NC)

RXD

OUTa

Recovered Data Out

125 Mbps data recovered by the Clock Recovery Module (CRM) from the

PMID data input

RXD

OUTb

These signals are only active when the Alternate PMD Enable (APMDEN) bit of the Alternate PMD

When these two pins are not used they should be left Not Connected (NC)

RXC

INa

Receive Clock In

Clock inputs to the Player section of the PLAYERa These inputs must be

synchronized with the RXD

IN inputs

RXC

INb

These signals are only active when the Alternate PMD Enable (APMDEN) bit of the Alternate PMD

When these two pins are not used pin 76 should be left Not Connected (NC) and pin 75 should be

connected directly to ground (Reserved

RXD

INa

Receive Data In

Data inputs to the Player section of the PLAYERa These inputs must be

synchronized with the RXC

IN inputs

RXD

INb

These signals are only active when the Alternate PMD Enable (APMDEN) bit of the Alternate PMD

When these two pins are not used pin 78 should be left Not Connected (NC) and pin 77 should be

connected directly to ground (Reserved

PMRDa

PMD Request Data

Differential 100k ECL 125 Mbps serial data output signals to the PMD

transmitter

PMRDb

TXCa

Transmit Clock

125 MHz 100k ECL compatible differential outputs synchronized to the outgoing

PMRD data

TXCb

These signals can be enabled using the Transmit Clock Enable (TXCE) bit in the Clock Generation

Module Register (CGMREG)

When these two pins are not used they should be left Not Connected (NC)

SDa

Signal Detect

Differential 100k ECL input signals from the PMD receiver indicating that a signal

is being received by the PMD receiver

SDb

TEL

PMD Transmitter Enable Level

A TTL input signal to select the PMD transmitter Enable (TXE)

signal level

TXE

PMD Transmitter Enable

A TTL output signal to enabledisable the PMD transmitter The output

level of the TXE pin is determined by three parameters the Transmit Enable (TE) bit in the Mode

The following rules summarize the output of the TXE pin

1 If TEe0 and TELeGND then TXEeVCC

2 If TEe0 and TELeVCC then TXEeGND

3 If TEe1 and OTM and TELeGND then TXEeVCC

4 If TEe1 and OTM and TELeVCC then TXEeGND

5 If TEe1 and not OTM and TELeGND then TXEeGND

6 If TEe1 and not OTM and TELeVCC then TXEeVCC

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