Motorola CPU32 Betriebsanweisung PDF herunterladen (Seite 66)

CPU32 Emulation 65

Chapter 5: Connecting and Configuring the Emulator

Designing a Target System for the Emulator

Debug port connections

If you plan to connect the emulator directly to the target system, the

target system should have a debug port (BDM) connector.

The connector should be a dual row header strip (“Berg connector”),

10 pins per inch, with 25 mil pins.

Some of the signals at the BDM port share the same lines, as shown in

the diagrams on the following pages.

When deciding whether to use an 8-pin or a 10-pin BDM port, consider

how often you are likely to encounter "hung" bus cycles. If you are

using an 8-pin BDM port, and a target bus cycle fails to terminate, you

will need to reset the target system. If you use a 10-pin BDM port, the

emulator will detect and terminate the "hung" cycle.

Therefore if your target system does not have a good bus monitor, or if

you are not using the built-in bus monitor, you should use a 10-pin

BDM port to take advantage of the DS

and BERR signals.

The emulator adds about 40 pF to all target system signals routed to

the debug connector. This added capacitance may reduce the rise time

of some signals beyond the processor specifications. If so, the target

may need to increase the pull-up current on these signal lines.

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 204 205

Keine Kommentare

Motorola CPU32 Betriebsanweisung Seite 66