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Connecting to the Target System
To connect to a target system via the HP E2457A Pentium Preprocessor
To connect to a target system via the HP E2457A
Pentium Preprocessor
If the target system does not have either the 20- or 30-pin Intel-defined
debug port, the HP E3491 Pentium Probe can be connected to the target
system through the HP E2457A Pentium Preprocessor Interface. The
64762-61602 cable assembly is used to connect the DBRESET signal from the
HP E3491A Pentium Probe because DBRESET is not a Pentium processor
pin. In target systems where it is not known if there are target system
resources driving the TCK, TDI, TDO, TMS, TRST,PRDY or R/S# signals, the
target system signals can be isolated from the processor by removing the
associated pins from one of the pin protectors on the bottom side of the
E2457A Pentium Preprocessor.
To connect to the target system:
1 Remove power from the target system, logic analyzer and the probe.
Plug the adapter board in the E3491A Pentium Probe.
2
Plug the 30-pin connector end of the 20-conductor cable assembly
3
into the adapter.
Plug the 20-pin connector end of the 20-conductor cable assembly
4
into the 20-pin debug connector of the HP E2457A Pentium
Preprocessor.
Connect the 2-conductor cable assembly to J3 or J6 of the E2457A
5
Pentium Preprocessor. J3 provides a high system reset to the target
system. J6 provides a low true system reset to the target system.
Connect the free leads from the 2-conductor cable assembly to the
6
target system reset circuitry.
Power up the software probe, then the logic analyzer, then the target
7
system.
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