
DSP96002ADM Technical Summary
Configuring the DSP96002ADM
MOTOROLA
DSP96002ADMUM/AD, Preliminary
2-9
2.4.2
External IRQA/IRQB/IRQC Input Path
The paths for the external input signals MODA/IRQA, MODB/IRQB, and
MODC/IRQC are selected by JG4, JG5, and JG6, respectively. These jumpers allow the
designer to use the multiplexed function of these inputs, or to select only the interrupt
function of these external signals.
If JG4–JG6 have a jumper connecting pins 1–2, the external signals are ignored during
reset. In this case, the DSP96002 uses the jumpers JG1–JG3 to determine the startup
mode after reset. Once the mode is set, the external signals are enabled and interrupts
received on these lines are accepted and processed. This has the advantage of assuring
that the chip uses the appropriate startup mode by eliminating spurious interrupts and
noise from these lines.
If JG4–JG6 have a jumper connecting pins 2–3, the external signals are connected directly
to the MOD/IRQ pins on the DSP96002 and the multiplexed MOD/IRQ function is used
and the setting of JG1–JG3 are ignored during reset.
gives the jumper options for the IRQA/IRQB/IRQC input paths.
Note:
The ADM is factory configured for external IRQA, IRQB, and IRQC inputs to
be gated by the reset logic.
Table 2-3
External IRQA/IRQB/IRQC Input Path
IRQx INPUT PATH
JG4 (IRQA)
JG5 (IRQB)
JG6 (IRQC)
Reset Logic
1–2
1–2
1–2
Directly to pin
2–3
2–3
2–3
Содержание DSP96002ADM
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