VSC8140QR 查看數據表（PDF） - Vitesse Semiconductor

零件编号

产品描述 (功能)

生产厂家

VSC8140QR

2.48832Gb/s 16:1 SONET/SDH Transceiver with Integrated Clock Generator

Vitesse Semiconductor 

Data Sheet

VSC8140

VITESSE

SEMICONDUCTOR CORPORATION

2.48832Gb/s 16:1 SONET/SDH

Transceiver with Integrated Clock Generator

Figure 10: Facility Loopback Data Path

RXIN+

RXIN-

RXCLKIN+

RXCLKIN-

TXOUT+

TXOUT-

TXCLKOUT+

TXCLKOUT-

FACLOOP

DQ

1

QD

0

1

0

1:16 Serial to

Parallel

16:1 Parallel to

Serial

2.48832GHz

PLL

RXOUT[15:0]

RXCLK16O

RXCLK32O

Facility Loopback

The facility loopback function is controlled by the FACLOOP signal. When the FACLOOP signal is set

high, the Facility Loopback mode is activated and the high-speed serial receive data (RXIN) is presented at the

high-speed transmit output (TXOUT), as depicted in Figure 10. In addition, the high-speed receive clock input

(RXCLKI) is selected and presented at the high-speed transmit clock output (TXCLKOUT). In Facility Loop-

back mode, the high-speed receive data (RXIN) is also converted to parallel data and presented at the low-speed

receive output pins (RXOUT[15:0]). The receive clock (RXCLKIN) is also divided down and presented at the

low-speed clock output (RXCLK16O).

Equipment Loopback Data Path

The Equipment Loopback function is controlled by the EQULOOP signal, which is active high. When the

Equipment Loopback mode is activated, the high-speed transmit data generated from the parallel to serial con-

version of the low-speed data (TXIN[15:0]) is selected and converted back to parallel data in the receiver sec-

tion and presented at the low-speed parallel data outputs (RXOUT[15:0]), as shown in Figure 11. The internally

generated OC-48 clock is used to generate the low-speed receive output clocks (RXCLK16O and

RXCLK16_32O). In Equipment Loopback mode, the transmit data (TXIN[15:0]) is serialized and presented at

the high-speed output (TXOUT) along with the high-speed transmit clock (TXCLKOUT) which is generated by

the on-chip PLL.

G52251-0, Rev. 4.0

9/6/00

© VITESSE SEMICONDUCTOR CORPORATION

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

Page 7

Share Link: