VSC8113QB 查看數據表（PDF） - Vitesse Semiconductor

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VSC8113QB

ATM/SONET/SDH 622 Mb/s Transceiver Mux/Demux with Integrated Clock Generation and Clock Recovery

Vitesse Semiconductor 

Data Sheet

VSC8113

VITESSE

SEMICONDUCTOR CORPORATION

ATM/SONET/SDH 622 Mb/s Transceiver Mux/Demux

with Integrated Clock Generation and Clock Recovery

Data Latency

The VSC8113 contains several operating modes, each of which exercise different logic paths through the

part. Table 10 bounds the data latency through each path with an associated clock signal.

Table 10: Data Latency

Circuit Mode

Description

Transmit

Receive

Equipment

Loopback

Facilities

Loopback

Data TXIN [7:0] to MSB at TXDATAOUT

MSB at RXDATAIN to data on RXOUT [7:0]

Byte data TXIN [7:0] to byte data on RXOUT [7:0]

MSB at RXDATAIN to MSB at TXDATAOUT

Clock

Reference

TXCLKOUT

RXCLKIN

TXCLKOUT

RXCLKIN

Range of Clock

cycles

4-13

25-35

27-35

2-4

Clock Recovery Unit

Table 11: Reference Frequency for the CRU

CRUREFSEL

1

1

0

STS12

1

0

CRUREFCLK

B2

B1

B0

Frequency

[MHz]

X

X

X

77.76 ± 500ppm

X

X

X

77.76 ± 500ppm

Uses CMU’s Reference Clock (See Table 12 below)

Output

Frequency

[MHz]

622.08

155.52

Clock Multiplier Unit

Table 12: Reference Frequency Selection and Output Frequency Control

Reference

STS12

B2

B1

B0

Frequency

[MHz]

1

1

1

0

19.44

1

0

1

0

38.88

1

0

0

1

51.84

1

0

0

0

77.76

0

1

1

0

19.44

0

0

1

0

38.88

0

0

0

1

51.84

0

0

0

0

77.76

Output

Frequency

[MHz]

622.08

622.08

622.08

622.08

155.52

155.52

155.52

155.52

G52154-0, Rev 4.2

3/19/99

© VITESSE SEMICONDUCTOR CORPORATION

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

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