LSI Logic Confidential
AC Timing
18-37
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Figure 18.29 JTAG Interface Timing Diagram
Table 18.25 JTAG Interface AC Timing Values
Symbol
Description
Timing Value
(ns)
Min
Max
T
CYC
TCK period
100.0
–
T
HIGH
TCK HIGH time
40.0
–
T
LOW
TCK LOW time
40.0
–
T
4
TDI, TMS, RST setup time to TCK
–
10.0
T
5
TDI, TMS, RST hold time from TCK
5.0
–
T
6
TDO delay time from TCK
–
2.0
T
7
TDO hold time from CLK
1.0
–
T
4
70%
50%
30%
TCK (I)
Note: TRST is an asynchronous reset.
TDI, TMS,
TRST (I)
TDO (O)
T
CYC
T
HIGH
T
LOW
T
5
T
7
T
6