VSC9111 查看數據表（PDF） - Vitesse Semiconductor

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VSC9111

SONET/SDH 2.5Gb/s Transport Terminating Transceiver

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

SONET/SDH 2.5Gb/s

Transport Terminating Transceiver

Target Specification

VSC9111

Pin

TSPFP_2

TSPREN_2

TSPDAT_2

TTOHCLK

TTOHFP

TTOHREN

Name

I/O

Transmit Special

Purpose Frame Pulse O

2

Transmit Special

Purpose Read Enable O

2

Transmit Special

Purpose Data 2

I

Transmit Transport

Overhead Clock

O

Transmit Transport

Overhead Frame Pulse

O

Transmit Transport

Overhead Read

O

Enable

Freq

Type

TTL

TTL

TTL

TTL

TTL

TTL

Description

Frame reference for the special purpose serial output port

TSPDAT_2.

Mode 1 (TSPCLK_2 continuous): The frame pulse is a one

clock cycle wide pulse indicating the start of a new data

stream on TSPDAT_2. When TSPFP_2 is asserted, the first

bit of TSPDAT_2 is sampled on the second rising edge

thereafter. TSPFP_2 changes on the falling edge of

TSPCLK_2.

Mode 2 (TSPCLK_2 gapped): The frame pulse is a one clock

cycle wide pulse (variable width due to the gapped clock)

indicating the start of a new data stream on TSPDAT_2.

When TSPFP_2 is asserted, the first bit of TSPDAT_2 is

sampled on the second rising edge thereafter. TSPFP_2

changes on the falling edge of TSPCLK_2.

Read enable signal for the TSPDAT_2 data stream. The

response latency from TSPREN_2 is asserted until

TSPDAT_2 is sampled is programmable. TSPREN_2 changes

on the falling edge of TSPCLK_2.

Serial data input for transmit special purpose port 2.

TSPDAT_2 is sampled on the rising edge of TSPCLK_2.

Clock reference for the transmit transport overhead port. The

clock is a 38.88MHz, 50% duty-cycle signal.

Frame reference for the transmit transport overhead port.

TTOHFP is a one clock cycle wide pulse indicating the start

of a new data stream on TTOH[3..0]. The response latency

from TTOHFP is asserted until the first bit on TTOH[3..0] is

sampled is programmable (see TTOHREN). TTOHFP

changes on the falling edge of TTOHCLK.

Read enable signal for the TTOH[3..0] data stream. The

response latency from TTOHREN is asserted until

TTOH[3..0] is sampled is programmable. TTOHREN

changes on the falling edge of TTOHCLK.

Page 10

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-589610/21/98

G52199-0, Rev. 1.2

3/8/99

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