VSC8541-02 datasheet(13/101 Pages) MICROCHIP

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Functional Descriptions

VMDS-10513 VSC8541-02 Datasheet Revision 4.1

Functional Descriptions

This section describes the functional aspects of the VSC8541-02 device, including available

configurations, operational features, and testing functionality. It also defines the device setup parameters

that configure the device for a particular application.

3.1

Operating Modes

The following table lists the operating modes of the VSC8541-02 device.

3.2

MAC Interface

The VSC8541-02 device supports RMII version 1.2, RGMII versions 1.3 and 2.0, and GMII/MII MAC

interfaces at 1.5 V, 1.8 V, 2.5 V, and 3.3 V operating voltages. In order to help reduce EMI, the VSC8541-

02 device also includes edge rate programmability for the MAC interface signals through register

27E2.7:5.

The recommended values for RS (as shown in Figure 3, page 5, Figure 4, page 5, Figure 6, page 7, and

Figure 7, page 7) are listed in the following table.

Refer to the MAC datasheet for the value to use for RT.

3.2.1

RGMII MAC Interface Mode

The VSC8541-02 device supports RGMII versions 1.3 and 2.0 (without HSTL modes). The RGMII

interface supports all three speeds (10 Mbps, 100 Mbps, and 1000 Mbps) and is used as an interface to

a RGMII-compatible MAC. The device is compliant with the RGMII interface specification when

VDDMAC is operating at 2.5 V. While the RGMII specification only specifies operation at 2.5 V, the

device can also support the RGMII interface at 1.5 V, 1.8 V, and 3.3 V.

Table 1 •

Operating Modes

Operating Mode

Supported Media

RGMII-Cat5

10/100/1000BASE-T

GMII-Cat5

10/100/1000BASE-T

RMII-Cat5

10/100BASE-T

Table 2 •

Recommended Values for RS (± 5%)

VDDMAC Value

RS Value

1.5 V

Ω

1.8 V

Ω

2.5 V

Ω

3.3 V

Ω

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