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DPC31 HW

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DPC31 HW Description

8 Test Support

The DPC31 has three test pins (TST1,NTEST1, NTEST2). For operation, all pins are to be at 0 Volt. To

switch the outputs to high-resistance (In Circuit Test), NTEST1/2 are to be at 1.

8.1 Emulator Connection for the C31

To emulate the C31 that is integrated in the DPC31, a standard emulator (such as Hitex MX51AH) can be

connected. The interfacing is shown in Figure 8.1-1. The emulator must be used with the SAB-C501-40 or a

type compatible with the timing, because of the more relaxed timing of the processor.

Problem Case:

If the C165 (@20MHz) without tristate time waitstate for DPC31 accesses and the C31

emulator (@24MHz) are operated together, there may be access conflicts to the internal DPC31 RAM.

Remedy:

For accesses by the C165 to the DPC31, the tristate time waitstate is to be set accordingly.

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