VSC7440XMT datasheet(45/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

mapping to a logical port number is configured in ANA_CL:PORT:PORT_ID_CFG.LPORT_NUM and

REW::PORT_CTRL.ES0_LPORT_NUM.

3.5

SERDES1G

The SERDES1G is a high-speed SerDes interface that can operate at 1.25 Gbps (SGMII/SerDes,

1000BASE-KX). In addition, 100 Mbps (100BASE-FX) is supported by oversampling.

The SERDES1G supports the configuration of several parameters for increased performance in the

specific application environment. The features include:

•

Baudrate support 1.25 Gbps

•

Programmable loop bandwidth and phase regulation behavior for clock and data recovery unit

(CDR)

•

Input buffer (IB) and output buffer (OB) configurations supporting:

IB Signal Detect/Loss of Signal (LOS) options

IB equalization (including corner frequency configuration)

OB selectable de-emphasis

OB amplitude drive levels

OB slew rate control

3.6

SERDES6G

The SERDES6G is a high-speed SerDes interface, which can operate at the following data rates.

•

1.25 Gbps (SGMII/SerDes 1000BASE-KX)

•

2.5 Gbps

•

100 Mbps (100BASE-FX) is supported by oversampling.

The SERDES6G supports the configuration of several parameters for increased performance in the

specific application environment. Features include:

•

Configurable baud rate support from 1.25 Gbps to 2.5 Gbps.

•

Programmable loop bandwidth and phase regulation behavior for clock and data recovery unit

(CDR)

•

Phase-synchronization of transmitter when used in multilane aggregates for low skew between

lanes

•

Input buffer (IB) and output buffer (OB) configurations supporting:

IB signal detect and loss of signal (LOS) options

IB adaptive equalization

OB programmable de-emphasis, 3 taps

OB amplitude drive levels

OB slew rate control

•

Loopbacks for system diagnostics

3.7

SERDES10G

The SERDES10G is a high-speed SERDES interface, which can operate from 1.25 Gbps up to

11.5 Gbps. Due to its frequency synthesizer, any data rate between these limits are supported. 100 Mbps

(100MBASE-FX) is supported by oversampling.

The SERDES10G supports the configuration of several parameters for increased performance in the

specific application environment. The features include the following:

•

Configurable baud rate support from 1.25 Gbps to 11.5 Gbps

•

Programmable CDR loop filter bandwidth and phase regulation behavior for receiver

•

Programmable offset and phase adjustment of sampling stage

•

Transmitter to receiver synchronization including programmable jitter filtering/attenuation (< 0.01 Hz)

•

I/O buffer configurations supporting:

IB signal detect and loss of signal (LOS) options

IB adaptive equalization with high performance CTLE and 4-tap DFE

OB programmable de-emphasis, 3 taps

OB configurable amplitude drive levels

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