UPD98405 datasheet(20/64 Pages) NEC

20 / 64 page

Data Sheet S12689EJ2V0DS00

µµµµPD98405

1.4 PMD Interface Signals (internal PHY mode, PHM of GMR register = 0)

The PMD interface is used to connect a module such as an optical transceiver/receiver.

Pin Name

Pin No.

I/O

I/O Level

Function

RDIT

278

P-ECL

True (+)

Receive serial data input.

Pull up this pin when it is not used.

RDIC

277

P-ECL

complement

(–)

Receive serial data input.

Pull down this pin when it is not used.

RCIT (shared

with FULL_B)

249

P-ECL

True (+)

Receive serial clock input.

This pin is used when an external clock recovery/synthesizer is

connected (PLL of GMR register = 1).

Pull up this pin when it is not used.

RCIC (shared

with

EMPTY_B)

248

P-ECL

complement

(–)

Receive serial clock input.

This pin is used when an external clock recovery/synthesizer is

connected (PLL of GMR register = 1).

Pull down this pin when it is not used.

REFCLK

(shared with

PHINT_B)

268

TTL

Reference clock.

This pin inputs a system clock (19.44 MHz) to the internal clock

recovery/synthesizer.

Pull up this pin when it is not used.

TDOT

273

P-ECL

True (+)

Transmit serial data output.

TDOC

274

P-ECL

complement

(–)

Transmit serial data output.

TFKT (shared

with Rx0)

242

P-ECL

True (+)

Transmit serial clock input.

This pin is used when an external clock recovery/synthesizer is

connected (PLL of GMR register = 1).

Pull up this pin when it is not used.

TFKC

(shared with

Rx1)

241

P-ECL

complement

(–)

Transmit serial clock input.

This pin is used when an external clock recovery/synthesizer is

connected (PLL of GMR register = 1).

Pull down this pin when it is not used.

PHYALM

(shared with

PHR/W_B)

266

TTL

PHY layer alarm detection signal.

This signal is asserted active (high) when any of the internally

monitored error statuses (CMDARM, LOS, OOF, LOF, LOP,

OCD, LCD, Line AIS, Path AIS, Line RDI, and Path RDI) is

detected. The error status to be reported can be selected by

using the internal AMR1 and AMR2 registers. One or more

error statuses can be selected.

(shared with

PHCE_B)

267

TTL

Signal detect.

This pin inputs the signal detect signal (when LOS is detected,

etc.) of the PMD device. When a low level is input to this pin,

the

µPD98405 assumes LOS detection.

Pull up this pin when it is not used.

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