VSC8541XMV-05 datasheet(85/101 Pages) MICROCHIP

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Electrical Specifications

VMDS-10513 VSC8541-02 Datasheet Revision 4.1

The following illustration shows the SOF indication timing.

Figure 33 •

SOF Indication Timing

5.2.14

Serial Management Interface

This section contains the AC specifications for the serial management interface (SMI).

Data to clock output skew (at PHY)

RX_SOF_CLK to RX_SOF

tSKEW_RX_SOF 700

1100

Data to clock output skew (at PHY)

TX_SOF_CLK to TX_SOF

tSKEW_TX_SOF 450

850

Table 113 •

Serial Management Interface AC Characteristics

Parameter

Symbol Minimum Typical Maximum

Unit Condition

MDC frequency1

For fCLK above 1 MHz, the maximum rise time and fall time is in relation to the frequency of the MDC clock period. For

example, if fCLK is 2 MHz, the maximum clock rise time and fall time is 50 ns.

fCLK

2.5

12.5

MHz

MDC cycle time

tCYC

400

MDC time high

tWH

MDC time low

tWL

Setup to MDC rising

tSU

Hold from MDC rising tH

MDC rise time

100

tCYC × 10%1

fCLK <1 MHz

fCLK from 1 MHz to 12.5 MHz

MDC fall time

100

tCYC × 10%1

fCLK <1 MHz

fCLK from 1 MHz to 12.5 MHz

MDC to MDIO valid

tCO

300

Time-dependent on the value of

the external pull-up resistor on

the MDIO pin

Table 112 •

Start of Frame Indication AC Characteristics (continued)

Parameter

Symbol

Minimum

Typical Maximum

Unit Condition

RX_SOF

RX_SOF_CLK

SKEW_RX_SOF

R,tF,

80%

20%

TX_SOF

TX_SOF_CLK

SKEW_TX_SOF

R,tF,

80%

20%

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