VSC8601 Datasheet
Functional Descriptions
3
Functional Descriptions
This section provides detailed information about how the VSC8601 device works, what
configurations and operational features are available, and how to test its functions. It
includes descriptions of the various device interfaces and how to set them up.
3.1
Interface and Media
The VSC8601 device operates with the interface and media shown in the following table
and illustration.
Table 1.
Interface and Media
Operating Mode
MAC Interface
Supported Media
RGMII - Cat5
RGMII
10/100/1000BASE-T
Figure 3.
RGMII to Cat5 Block Diagram
RGMII
Cat5
Cat5
Link Partner
MAC
VSC8601
3.2
MAC Interface
The VSC8601 supports RGMII versions 1.3 and 2.0 (2.5 V, 3.3 V) MAC interface.
3.2.1
MAC Resistor Calibration
To simplify board design, the VSC8601 MAC interface uses SimpliPINTM outputs that can
self-calibrate to a desired impedance characteristic to eliminate the need for series
termination resistors. By default, these RX output pins calibrate to 50 Ω. In addition,
MII Register 19E, bits 15:14 can be used to select different target impedances. For
more information, see “MAC Resistor Calibration Control,” page 58.
3.2.2
RGMII MAC Interface Mode
The RGMII interface can support all three speeds (10 Mbps, 100 Mbps, and 1000 Mbps)
and is used as an interface to an RGMII-compatible MAC.
Revision 4.1
September 2009
Page 17
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
