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VSC8540RT Datasheet(PDF) 16 Page - Microchip Technology

Part # VSC8540RT
Description  Radiation-Tolerant Single Port Fast Ethernet Copper PHY with RGMII/MII/RMII Interfaces
PDF  87 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

VSC8540RT Datasheet(HTML) 16 Page - Microchip Technology

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VSC8540RT
DS60001603E-page 16
 2022 Microchip Technology Inc. and its subsidiaries
5.2.2
MII INTERFACE MODE
The MII interface supports 10 Mbps and 100 Mbps speeds, and is used as an interface to a MII-compatible MAC. The
device is compliant with the MII interface specification when VDDMAC is operating at 3.3V. While the MII specification
only specifies operation at 3.3V, the device can also support the MII interface at 1.5V, 1.8V, and 2.5V.
FIGURE 5-2:
MII MAC INTERFACE
5.2.3
RMII MODE
The RMII interface supports 10 Mbps and 100 Mbps speeds, and is used as an interface to a RMII-compatible MAC.
The device is compliant with the RMII interface specification when VDDMAC is operating at 3.3V. While the RMII spec-
ification only specifies operation at 3.3V, the device can also support the RMII interface at 1.5V, 1.8V and 2.5V.
FIGURE 5-3:
RMII MAC INTERFACE
5.2.3.1
RMII Pin Allocation
The following table lists the chip pins used for RMII signaling in RMII mode.
TABLE 5-3:
RMII PIN ALLOCATION
Chip Pin
RMII Signal
TX_CLK
RMII_CLKIN
RX_CLK
RMII_CLKOUT
MII MAC
RXD[3]
RXD[2]
RXD[1]
RXD[0]
TX_ER
RX_CLK
RX_DV
SimpliPHY
RXD[3]
RXD[2]
RXD[1]
RXD[0]
TX_ER
RX_CLK
RX_DV
R
T
R
S
R
S
R
S
R
S
R
S
R
S
TXD[3]
TXD[2]
TXD[1]
TXD[0]
TXD[3]
TXD[2]
TXD[1]
TXD[0]
R
T
R
T
R
T
R
T
TX_EN
TX_EN
R
T
TX_CLK
MII_TXCLK
COL
COL
CRS
CRS
RX_ER
RX_ER
R
S
R
S
R
S
R
S
RMII MAC
TX_ER
TX_EN
TXD[1]
TXD[0]
RX_ER
CRS_DV
RXD[1]
RXD[0]
RMII_CLK
SimpliPHY
TXD[3]
TX_EN/TX_CTL
TXD[1]
TXD[0]
RXD[3]
RX_DV/RX_CTL
RXD[1]
RXD[0]
GTX_CLK
R
T
R
T
R
T
R
T
R
S
R
S
R
S
R
S
R
S
RX_CLK
External
50 MHz clock



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