Open Core Protocol Debug Interface Specification rev 1.0 - OCP-IP

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the bus but not used in a design then all inputs have to be tied correctly high or low. Best is not
to instantiate superfluous sockets.
Power Isolation
If isolation is required on any of these signals, the trigger signal should be held in the high
state.
B.4.3 Trigger Generation
C-TRIG uses PIEMU0ON[m] and PIEMU0OEN[m] to create Trigger0. Similarly, C-TRIG
uses PIEMU1ON[m] and PIEMU1OEN[m] to create Trigger1.
B.4.3.1 Trigger Output Enable
There are two trigger output enables; one for each trigger. TriggerxOZ is active low.
Generation
The output enable for trigger 0 is called Trigger0_N. It is 1 unless one or more of the
following is true:
PIEMU0OEN[m] = 0 and PIEMU0ON[m] = 0, for any m = 0…M, where M is the number of
secondary TAPs – 1
The output enable for trigger 1 is called Trigger1_N. It is 1 unless one or more of the
following is true:
PIEMU1OEN[m] = 0 and PIEMU1ON[m] = 0, for any m = 0…M, where M is the number of
secondary TAPs – 1
In other words, if any one or more modules call for the emulation trigger to be used as an
output and the module is driving the trigger signal to zero, then the Trigger0_N will become 0.
Connections
The value of each trigger’s enable is driven out to the device pins via the PODnEMUxOZ
signals, where x is the trigger number. On-chip cross triggering shall function even if the
EMU0,EMU1 pins are not available or any other debug / application function is mapped to
these pins.
Trigger0_N drives:
Trigger1_N drives:
POEMU0OEN and POEMU0ON
POEMU1OEN and POEMU1ON
When configured externally to C-TRIG, trigger0 can drive EMU0, while trigger1 can drive
EMU1.
B.4.3.2 Trigger Output
There are two triggers. Triggerx_N is active low.
Generation
The default state for a trigger is 1. It is held at this value unless one of the following conditions
forces the trigger to be driven to 0. In the following equations, X or x represents the trigger
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