4.0 Electrical/Mechanical Specifications
CX28394/28395/28398
4.7 JTAG Interface Timing
Quad/x16/Octal—T1/E1/J1 Framers
4.7 JTAG Interface Timing
Table 4-17. Test and Diagnostic Interface Timing Requirements
Symbol
Parameter
Minimum
Maximum
Units
ns
1
2
3
4
TCK pulse width high
TCK pulse width low
80
80
5
—
—
—
—
ns
TMS, TDI setup to TCK rising edge
TMS, TDI hold after TCK high
ns
20
ns
Table 4-18. Test and Diagnostic Interface Switching Characteristics
Symbol
Parameter
TDO hold after TCK falling edge
TDO delay after TCK low
Minimum
Maximum
Units
ns
5
6
7
8
0
—
20
—
10
—
10
—
ns
TDO enable (Low Z) after TCK falling edge
TDO disable (High Z) after TCK low
ns
ns
Figure 4-22. JTAG Interface Timing
TDO
7
5
8
1
6
TCK
2
3
4
TDI
TMS
4-24
Conexant
100054E
CONEXANT [ CONEXANT SYSTEMS, INC ]
