VSC8540RT datasheet(73/87 Pages) MICROCHIP

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]

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DS60001603E-page 73

VSC8540RT

8.4.9

UNCOMPENSATED RGMII

The following table lists the characteristics when using the device in RGMII uncompensated mode. For more information

about the RGMII uncompensated timing, see Figure 8-6.

TABLE 8-25:

UNCOMPENSATED RGMII AC CHARACTERISTICS

Parameter

Symbol

Minimum Typical Maximum Unit

Condition

Clock frequency

fCLK

2.5

MHz 100BASE-TX operation

10BASE-T operation

Duty cycle

Data to clock output skew (at

Transmitter)1

1. When operating in uncompensated mode, the PC board design requires a clock to be routed such that an

additional trace delay of greater than 1.5 ns is added to the associated clock signal.

tSKEWT

–500

500

Data to clock output skew (at

Receiver)1

tSKEWR

1.8

2.6

TX_CLK switching threshold

VTHRESH

0.75

0.90

1.25

1.65

VDDMAC = 1.5V

VDDMAC = 1.8V

VDDMAC = 2.5

VDDMAC = 3.3V

Clock/data output rise and fall

times

tR, tF

0.75

VDDMAC = 1.5V,

27E2.7:5 = 111

VDDMAC = 1.8V,

27E2.7:5 = 111

VDDMAC = 2.5V,

27E2.7:5 = 100

VDDMAC = 3.3V,

27E2.7:5 = 100

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