supporting Sequence of Events

Publication 1732E-UM002A-EN-P - March 2010
64 Using the Module
structure is then moved to another array used to sort the data. In this example,
32 bits of each 64-bit timestamp are moved to the new array.
Acknowledge Timestamp Latching Timestamp Data
In most cases, Timestamp Latching is enabled. This means that once the
module timestamps an input transition, the module will not timestamp another
transition in the same direction on the same input until you acknowledge the
data from the first timestamped transition; when you acknowledge data, you
clear it from the module.
To clear data from the module, you must acknowledge them via the module’s
output tags. You can clear data in the following ways:
• Clear latched timestamp data for specific inputs – As data is
acknowledged, it is cleared from the module, and the module will once
again timestamp the first new transition for the input in the cleared
direction(s).
To clear timestamp data for specific inputs, you must complete the
following steps:
a. Write to the EventAck output tag (
O.EventAck ). This tag determines
which edge you will clear (acknowledge).
• 0 = clear only the falling edge timestamp (I.Timestamp[x].OnOff)
• 1 = clear only the rising edge timestamp (I.Timestamp[x].OffOn)
• 2 = clear both the falling and rising edge timestamps