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VSC9111

SONET/SDH 2.5Gb/s Transport Terminating Transceiver

Vitesse Semiconductor 

Target Specification

VSC9111

VITESSE

SEMICONDUCTOR CORPORATION

SONET/SDH 2.5Gb/s

Transport Terminating Transceiver

Pin

Name

I/O

TXRST

Parallel Drop

Transmit Reset

O

RXDAT_

[A..D][1..4][1..

0]

Parallel Drop Receive

Data

O

RXCLK_

[A..D]

Parallel Drop Receive

Clock

O

RXFP_

[A..D]

Parallel Drop Receive

Frame Pulse

O

Freq

Type

TTL

TTL

TTL

TTL

Description

STS-3/12/48 Transmit Interface Reset.

Indicates synchronisation errors on the STS-3/12/48 transmit

data streams. The signal is used for resynchronizing the STS-

3/12 transmit flows. Synchronization status is based on the

transmit frame pulses (TXFP_xN), which must be aligned

within +/- 2 clock cycles. TXRST changes on the rising edge

of TXCLKOUT_x.

x = [A,B,C,D], N = [1,2,3,4].

STS-3/12/48 Receive Data.

In STS-3 mode, RXDAT_A1[1..0] carries STS-3 #1,

RXDAT_A2[1..0] carries STS-3 #2, …, RXDAT_D3[1..0]

carries STS-3 #15 and RXDAT_D4[1..0] carries STS-3 #16,

i.e. each STS-3 interface is 2 bits wide. RXDAT_xN[1] is the

most significant bit.

In STS-12 mode, RXDAT_A[1..4][1..0] carries STS-12 #1,

RXDAT_B[1..4][1..0] carries STS-12 #2, …, and

RXDAT_D[1..4][1..0] carries STS-12 #4, i.e. each STS-12

interface is 8 bits wide. RXDAT_x1[1] is the most significant

bit, RXDAT_x1[0] the second most significant bit, …, and

RXDAT_x4[0] the least significant bit.

In STS-48 mode, RXDAT_[A..D][1..4][1..0] carries the STS-

48 data stream, i.e. RXDAT_[A..D][1..4][1..0] is interpreted

as one 32 bit bus. RXDAT_A1[1] is the most significant bit,

…, and RXDAT_D4[0] the least significant bit.

RXDAT_xN changes on the falling edge of RXCLKA-D.

x = [A,B,C,D], N = [1,2,3,4]

STS-3/12/48 Receive Clock.

Clock reference for the STS-3/12/48 receive flow carried in

RXDAT_xN. The clock frequency is nominally 77.76MHz

equivalent to STS-3/12/48 operation.

x = [A,B,C,D], N = [1,2,3,4].

STS-3/12/48 Receive Frame Pulse.

Frame reference for the STS-3/12/48 receive flows carried in

RXDAT_xN. The frame pulse is a one clock cycle pulse

coincident with the first payload byte (i.e. first byte following

last Z0) of the STS-3/12/48 frames (optionally the first

overhead byte, A1). RXFP_[A..D] changes on the falling

edge of RXCLK_[A..D].

In STS-3 mode, the frame pulse is only asserted during the

first cycle of the first payload byte (optionally the first

overhead byte).

x = [A,B,C,D], N = [1,2,3,4].

G52199-0, Rev. 1.2

3/8/99

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

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