VSC8601 Datasheet
Electrical Specifications
5.3.3
JTAG Interface
The following table lists the characteristics for the JTAG testing feature. For information
about the JTAG interface timing, see Figure 18, page 77.
Table 71.
AC Characteristics for the JTAG Interface
Parameter
Symbol Minimum Maximum Unit
TCK frequency
fCLK
tCYC
tWH
tWL
tSU
tH
10
MHz
ns
TCK cycle time
100
45
45
10
10
TCK time high
ns
TCK time low
ns
Setup time to TCK rising
Hold time from TCK rising
TCK to TDO valid
ns
ns
tCO
15
ns
Figure 18.
JTAG Interface Timing
tCYC
TCK
tWL
tWH
tSU
tH
TDI
TMS
TDO
tCO
5.3.4
SMI Interface
Use the information in the following table when incorporating the VSC8601 device SMI
interface into your own design. For information about the SMI interface timing, see
Figure 19, page 78.
Table 72.
AC Characteristics for the SMI Interface
Parameter
MDC frequency(1)
Symbol Minimum
Typical
2.5
Maximum
Unit Condition
fCLK
12.5
MHz
ns
MDC cycle time
tCYC
80
400
Revision 4.1
September 2009
Page 77
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