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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

TXFP_

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

TXPRTY_

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

TXCLK_

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

TXCLKOUT_

[A-D]

Name

I/O

Parallel Drop

Transmit Frame Pulse

I

Parallel Drop

Transmit Parity

I

Parallel Drop

Transmit Clock

I

Parallel Drop

Transmit Clock

O

Source

Freq

Type

TTL

TTL

TTL

TTL

Description

STS-3/12/48 Transmit Frame Pulse.

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

TXDAT_xN. The frame pulses shall have low-high transitions

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).

In STS-3 mode, TXFP_xN is a frame reference for

TXDAT_xN. TXFP_xN is sampled on the rising edge of

TXCLK_xN.

In STS-12 mode, TXFP_x1 is a frame reference for

TXDAT_x. TXFP_x2, TXFP_x3 and TXFP_x4 are unused.

TXFP_x1 is sampled on the rising edge of TXCLK_x1.

In STS-48 mode, only TXFP_A1 is used. TXFP_A1 is

sampled on the rising edge of TXCLK_A1.

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

STS-3/12/48 Transmit Parity.

Parity (even/odd) over the parallel transmit STS-3/12/48 data

streams (TXDAT_xN).

In STS-3 mode, TXPRTY_xN is the parity over TXDAT_xN

(2 bit parity). TXPRTY_xN is sampled on the rising edge of

TXCLK_xN.

In STS-12 mode, TXPRTY_x1 is the parity over TXDAT_xN

(8 bit parity). TXPRTY_x1 is sampled on the rising edge of

TXCLK_x1. Optionally, 2 bit parities can be used in this

mode (as described above for STS-3 mode).

In STS-48 mode, TXPRTY_A1 is the parity over TXDAT_xN

(32 bit parity). TXPRTY_A1 is sampled on the rising edge of

TXCLK_A1.Optionally, 2 bit or 8 bit parities can be used in

this mode (as described above for STS-3 and STS-12 modes,

respectively).

TXOHEN_x is optionally included in parity.

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

STS-3/12/48 Transmit Clock.

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

TXDAT_xN. The clock frequency is nominally 77.76MHz

equivalent to STS-3/12/48 operation.

In STS-3 mode, all TXCLK_xN clocks are used.

In STS-12 mode, only TXCLK_x1 are used.

In STS-48 mode, only TXCLK_A1 is used.

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

STS-3/12/48 Transmit Clock Source.

Clock source for the transmit direction of the drop side STS-

3/12/48 interfaces. One clock is provided for each of the four

STS-12 (or quad STS-3) interfaces. The clock frequency is

nominally 77.76MHz equivalent to STS-3/12/48 operation.

Page 6

© 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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