Freescale Semiconductor Target Interface MMDS0508 - Manual (Page 45)

MMDS Target Comp onent
4.10 Bus Analyzer
4–45 MMDS0508 Target Interface
4.10.2.8 Time Tag Clock Setup
Each frame of the trace buffer includes a time reference value, or time tag. You can
specify the clock signal that the analyzer uses for these time tags. To do so, choose the
Trace>Setup... menu selection, to open the Bus Analyzer Configuration dialog box as
shown in
Figure 4.19 . Then click on the Time Tag Clock tab.
Figure 4.19 Bus Analyze Time Clock Setup
4.10.2.8.1 Clock Frequency
In the Time Tag Clock Frequency area, select the clock-frequency source: an internal
oscillator at 16, 8, 4, 2, or 1 Mhz; an external clock; a bus clock; or a programmable
clock. In general, the faster clock rates provide higher resolution, so are appropriate
for faster emulator clock rates.
If you specify a programmable clock, you must enter the Hz frequency, 50 to 50,000,
in the edit box. If you specify a Nominal value, the analyzer uses the closest, Actual
frequency value. (A nominal value is a non-integer quotient of dividing 500,000 Hz by
an integer. An actual value is an integer quotient of dividing 500,000 Hz by an integer.
For example, suppose that you specify 986 in the edit box. 500,000 divided by the
integer 507 yields the non-integer quotient 986.193. If you specify a nominal value,
the analyzer rounds this value up to 1000, which is the integer quotient of 500,000
divided by 500.)
To save your time tag clock settings, and close the dialog box, click the OK button.
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