VSC6501 查看數據表（PDF） - Vitesse Semiconductor

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VSC6501

and Cable Driver at 1.485 Gb/s SMPTE-292M Reclocker

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC6501

SMPTE-292M Reclocker

and Cable Driver at 1.485 Gb/s

Table 1: Reclocker Logic Signals

SIGNAL

292M

BYPASS

FUNCTION

292M Output:

When HIGH, indicates that the output of the CRU is a SMPTE-292M style signal. This output

combines the analog signal detect with a state machine which monitors SAV/EAV events. If 4000

words occur without an SAV/EAV, then this output goes LOW to indicate invalid data. This output

goes HIGH if the analog signal detection is asserted and an SAV/EAV is located within the last 4000

words.

BYPASS Input:

When HIGH, SDI/SDI are routed around the CRU directly to the SDO0/SDO1 outputs. When LOW,

the output of the CRU is sent to SDO0/SD)1 outputs.

Table 2: Reclocker Operation

SIGNAL

292M

BYPASS

O0/O1 Serial Outputs

RCLK Output

CRU Bypass Mux

SDI/SDI

Serial Input

SIGDET Output

FRAME Output

1.001 Output

LINE Output

HANC Output

RECLOCKER

Operation

Active

Active

SOURCE IS CRU SDI/SDI

BUFFERED REFCLK

SDI/SDI

GOES TO

SDO0/SDO1

ACTIVE

ACTIVE

ACTIVE

ACTIVE

ACTIVE

ACTIVE

Application Information

The VSC6501 cable driver output is intended to fully comply with the SMPTE 292M cable driver specifica-

tions. This includes an 800mV swing and a return loss of less than -15dB. The circuit shown below shows how

to connect the output of the VSC6501to the 75 ohm cable and downstream device. The output of the VSC6501

is actually 1200mV. The output termination circuit shown below attenuates the output signal to 800mV and

ensures a return loss better than -15dB. The ISET resistor is 1.78K

G52310-0, Rev. 2.0

4/10/00

© VITESSE SEMICONDUCTOR CORPORATION

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

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