Issues with minimum setup and hold times can always be resolved by decreasing the TCK frequency,
because this increases the separation between signals changing and being sampled.
Note
There are no separate timing requirements for the adaptive clocking mode. In adaptive mode, the
DSTREAM-ST unit samples TDO on the rising edge of RTCK and not TCK, so TDO timing is relative
to RTCK.
The following table shows the timing requirements for the JTAG signals on the DSTREAM-ST probe:
Table 2-7 DSTREAM-ST JTAG Characteristics
Parameter Min Max Description
T
clk
16.67ns 100ms TCK period
T
ds
49% 51% TCK Duty Cycle
2 ARM
®
DSTREAM-ST target interface connections
2.5 About JTAG port timing characteristics
ARM 100893_0100_00_en Copyright © 2017 ARM Limited or its affiliates. All rights reserved. 2-29
Non-Confidential
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