External Irqa/Irqb/Irqc Input Path; Table 2-3 External Irqa/Irqb/Irqc Input Path - Motorola DSP96002ADM User Manual

Table of Contents

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.

Table 2-3 gives the jumper options for the IRQA/IRQB/IRQC input paths.

IRQx INPUT PATH

Reset Logic

Directly to pin

Note:

The ADM is factory configured for external IRQA, IRQB, and IRQC inputs to

be gated by the reset logic.

MOTOROLA

JG4 (IRQA)

1–2

2–3

DSP96002ADMUM/AD, Preliminary

DSP96002ADM Technical Summary

Configuring the DSP96002ADM

JG5 (IRQB)

JG6 (IRQC)

1–2

2–3

2-9

Table of Contents