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

OCP-IP Confidential
If EMU1 is driven LOW it will result in the generation of GNEMUINT1, which will in turn
generate the IC_EMUINTR.
IC_EMUINTR is an input of the CPU interrupt controller.
B.3.7 EMUx Trigger Action – Notify on Low Counter Overflow
The EMU0 and EMU1 trigger control can be used to notify the environment outside the chip
that the benchmark counters have overflowed. This function is selected by writing a ‘0110’ to
the TriggerXControl field. The following conditions hold true when this trigger control
function is enabled:
The change in state on the EMUx pins may be used at the system level to either stop or
interrupt another CPU or signal an external piece of equipment.
B.3.8 EMUx Trigger Action – Notify on Watchpoint Match
The EMU0 and EMU1 trigger control can be used to notify the environment outside the chip
that the watchpoints from the CPU matched. This function is selected by writing a ‘1000’ to
the TriggerXControl field. The following conditions hold true when this trigger control
function is enabled:
The change in state on the EMUx pins may be used at the system level to either stop or
interrupt another CPU or signal an external piece of equipment.
B.3.9 EMUx Trigger Action - Notify on Extern Event
The EMU0 and EMU1 trigger control can be used to notify the environment outside the chip
that an event has occurred on the EXTERN input signals. This function is selected by writing a
‘1101’ to the TriggerXControl field.
B.3.10 Trigger Control – Bit IO
The EMU0 and EMU1 trigger control can be used to directly drive and/or read the levels
present on the EMU pins. This function is selected by writing ‘1111’ to the TriggerXControl
field. The following conditions hold true when this trigger control function is enabled:
Each EMU pin can be tri-stated or driven to a high or low level
The current level of each EMU pin can be read
B.4 SOC Integration
The SOC manages two emulation triggers: trigger0 and trigger1. Based upon settings in a
device or emulation pin manager, these triggers may be connected to the emulation device pins
called EMU0 and EMU1. These triggers are also driven by signals from each core and are
used to facilitate co-emulation. Cross triggering between cores within the device can occur
even while the triggers are not connected to the external device pins.
Functionality
A trigger is used for both input and output. Each trigger consists of 3 signals.
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