What Additional Measurements Must I Make - HP 1652B Getting Started Manual

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Your frost assumption is that incorrect data is stored to this memory

location. Assume this routine is in ROM since it is part of the operating

system for your circuit. Since the ROM is programmed by the software

designer, you have the software designer verify whether or not the data

at address 8932 is correct. The software designer telIs you that the data

is correct. Now what do you do?

Now it's time to look at the hardware to see if it is causing incorrect

data when the microprocessor reads this memory address. You decide

you want to see what is happening on the address and data buses

during this routine in the time domain.

In order to see the time domain, you need the timing analyzer.

Since the problem exists during the routine that starts at address 8930,

you decide you want to see the timing waveforms on the address and

Measurements

data bus when the routine is running. You also want to see the control

signals that control the read cycle. You will then compare the

Must I Make?

waveforms with the timing diagrams in the 68000 data book.

Your measurement, then, requires verification of the following:

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The control signals you must check are listed below:

Correct timing of the control signals.

Stable addresses and data during the memory read.

System clock.

Address strobe (AS).

Lower and upper data strobes (LDS and UDS).

Data transfer acknowledge (DTACK).

Read/write (R/W).

Timing/State Measurement Example

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