VSC8541-02 datasheet(82/101 Pages) MICROCHIP

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Electrical Specifications

VMDS-10513 VSC8541-02 Datasheet Revision 4.1

Figure 29 •

MII Receive Timing

5.2.11

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 30, page 74.

Table 109 •

Uncompensated RGMII AC Characteristics

Parameter

Symbol

Minimum Typical Maximum Unit Condition

Clock frequency

fCLK

125

2.5

MHz 1000BASE-T operation

100BASE-TX operation

10BASE-T operation

Duty cycle

Data to clock output skew (at

Transmitter)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

tSKEWR1

1.8

2.6

TX_CLK switching threshold

VTHRESH

0.75

0.90

1.25

1.65

VDDMAC = 1.5 V

VDDMAC = 1.8 V

VDDMAC = 2.5 V

VDDMAC = 3.3 V

Clock/data output rise and fall

times

tR, tF

0.75

VDDMAC = 1.5 V,

27E2.7:5 = 111

VDDMAC = 1.8 V,

27E2.7:5 = 111

VDDMAC = 2.5 V,

27E2.7:5 = 100

VDDMAC = 3.3 V,

27E2.7:5 = 100

RX_CLK

RXD[3:0]

RX_DV

RX_ER

tSU

Valid Data

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