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VSC8658 Datasheet(PDF) 75 Page - Microsemi Corporation

Part # VSC8658
Description  Octal 10/100/1000BASE-T PHY and 100BASEFX/1000BASE-X SerDes
PDF  95 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC8658 Datasheet(HTML) 75 Page - Microsemi Corporation

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Electrical Specifications
VMDS-10242 VSC8658 Datasheet Revision 4.1
67
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
10
MHz
TCK cycle time
tCYC
100
ns
TCK time high
tWH
45
ns
TCK time low
tWL
45
ns
Setup time to TCK rising
tSU
10
ns
Hold time from TCK rising
tH
10
ns
TCK to TDO valid
tCO
15
ns
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
80
400
ns
MDC time high
tWH
20
50
ns
MDC time low
tWL
20
50
ns
Setup to MDC rising tSU
10
ns
Hold from MDC
rising
tH
10
ns
MDC rise time
tR
100
tCYC × 10%(1)
ns
For MDC = 0 – 1 MHz
For MDC = 1 MHz – fCLK(MAX)
TCK
TDI
TMS
tSU
tH
tCYC
tWH
tWL
tCO
TDO



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