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VSC8540RT 数据表(PDF) 15 Page - Microchip Technology |
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VSC8540RT 数据表(HTML) 15 Page - Microchip Technology |
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15 / 87 page  2022 Microchip Technology Inc. and its subsidiaries DS60001603E-page 15 VSC8540RT 5.0 FUNCTIONAL DESCRIPTIONS This section describes the functional aspects of the VSC8540RT device, including available configurations, operational features, and testing functionality. It also defines the device setup parameters that configure the device for a particular application. 5.1 Operating Modes The following table lists the operating modes of the VSC8540RT device. 5.2 MAC Interface The VSC8540RT device supports RMII version 1.2, RGMII versions 1.3 and 2.0, and MII MAC interfaces at 1.5V, 1.8V, 2.5V, and 3.3V operating voltages. In order to help reduce EMI, the VSC8540RT device also includes edge rate pro- grammability for the MAC interface signals through register 27E2.7:5. The recommended values for RS resistor (as shown in Figure 5-1, Figure 5-4, and Figure 5-5) are listed in the following table. Refer to the MAC datasheet for the value to use for RT resistor. 5.2.1 RGMII MAC INTERFACE MODE The VSC8540RT device supports RGMII versions 1.3 and 2.0 (without HSTL modes). The RGMII interface supports 10 Mbps and 100 Mbps speeds, 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 2.5V. While the RGMII specification only specifies oper- ation at 2.5V, the device can also support the RGMII interface at 1.5V, 1.8V, and 3.3V. FIGURE 5-1: RGMII MAC INTERFACE TABLE 5-1: OPERATING MODES Operating Mode Supported Media RGMII-Cat5 10/100BASE-TX MII-Cat5 10/100BASE-TX RMII-Cat5 10/100BASE-TX TABLE 5-2: RECOMMENDED VALUES FOR RS (± 5%) VDDMAC Value RS Value 1.5 V 27 1.8V 33 2.5V 39 3.3V 39 RGMII MAC TXD[3] TXD[2] TXD[1] TXD[0] RXD[3] RXD[2] RXD[1] RXD[0] TX_CLK TX_CTL RX_CLK RX_CTL SimpliPHY TXD[3] TXD[2] TXD[1] TXD[0] RXD[3] RXD[2] RXD[1] RXD[0] GTX_CLK TX_CTL RX_CLK RX_CTL R T R T R T R T R T R T R S R S R S R S R S R S |
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