VSC8658 datasheet(75/95 Pages) MICROSEMI

tên linh kiện	VSC8658

Giải thích chi tiết về linh kiện	Octal 10/100/1000BASE-T PHY and 100BASEFX/1000BASE-X SerDes

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Electrical Specifications

VMDS-10242 VSC8658 Datasheet Revision 4.1

6.3.3

JTAG Interface

The following table lists the characteristics for the JTAG testing feature. The illustration provides a

diagram of the timing.

Figure 19 •

JTAG Interface Timing

6.3.4

SMI Interface

Use the information in the following table when incorporating the VSC8658 device SMI interface into your

own design. The illustration provides information about SMI interface timing.

Table 76 •

AC Characteristics for the JTAG Interface

Parameter

Symbol Minimum

Maximum

Unit

TCK frequency

fCLK

MHz

TCK cycle time

tCYC

100

TCK time high

tWH

TCK time low

tWL

Setup time to TCK rising

tSU

Hold time from TCK rising

TCK to TDO valid

tCO

Table 77 •

AC Characteristics for the SMI Interface

Parameter

Symbol Minimum

Typical

Maximum

Unit Condition

MDC frequency(1)

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

MDC rise time

100

tCYC × 10%(1)

For MDC = 0 – 1 MHz

For MDC = 1 MHz – fCLK(MAX)

TCK

TDI

TMS

tSU

tCYC

tWH

tWL

tCO

TDO

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