Intel IXF1104 manual 5.6.2.3Receiver Operational Overview, 5.6.2.4Selective Power-Down, Datasheet

IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller

Table 29. SerDes Driver TX Power Levels

				Normalized
DRVPWRx[3]	DRVPWRx[2]	DRVPWRx[1]	DRVPWRx[0]	Driver Power	Driver Power
				Setting
1	0	1	1	2.0	20 mA
1	1	0	1	1.0	10 mA
1	1	1	0	0.5	5 mA

NOTE: All other values are reserved.

5.6.2.3Receiver Operational Overview

The receiver structure performs Clock and Data Recovery (CDR) on the incoming serial data stream. The quality of this operation is a dominant factor for the Bit Error Rate (BER) system performance. Feed forward and feedback controls are combined in one receiver architecture for enhanced performance. The data is over-sampled and a digital circuit detects the edge position in the data stream. A signal is not generated if an edge is not found. A feedback loop takes care of low-frequency jitter phenomenon of unlimited amplitude, while a feed forward section suppresses high-frequency jitter having limited amplitude. The static edge position is held at a constant position in the over-sampled by a constant adjustment of the sampling phases with the early and late signals.

5.6.2.4Selective Power-Down

The IXF1104 offers the ability to selectively power-down any of the SerDes TX or RX ports that are not being used. This is done via “TX and RX Power-Down ($0x787)” on page 219.

5.6.2.5Receiver Jitter Tolerance

The SerDes receiver architecture is designed to track frequency mismatch, recover phase, and is tolerant of low-frequency data jitter. Figure 23 specifies the SerDes core receiver sinusoidal jitter tracking capabilities.

104 Datasheet

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004