DSP56011 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56011

24-BIT DVD DIGITAL SIGNAL PROCESSOR

Motorola => Freescale 

Signal/Connection Descriptions

Interrupt and Mode Control

INTERRUPT AND MODE CONTROL

Table 1-5 Interrupt and Mode Control

PRELIMINARY Signal

Name

MODA

IRQA

Type

Input

Input

State During

Reset

Signal Description

Input (MODA) Mode Select A—This input signal has three functions:

• to work with the MODB and MODC signals to

select the DSP’s initial operating mode,

• to allow an external device to request a DSP

interrupt after internal synchronization, and

• to turn on the internal clock generator when the

DSP is in the Stop processing state, causing the DSP

to resume processing.

MODA is read and internally latched in the DSP when the

processor exits the Reset state. The logic state present on the

MODA, MODB, and MODC pins selects the initial DSP

operating mode. Several clock cycles after leaving the Reset

state, the MODA signal changes to the external interrupt

request IRQA. The DSP operating mode can be changed by

software after reset.

External Interrupt Request A (IRQA)—The IRQA input is a

synchronized external interrupt request. It may be

programmed to be level-sensitive or negative-edge

triggered. When the signal is edge-triggered, triggering

occurs at a voltage level and is not directly related to the fall

time of the interrupt signal. However, as the fall time of the

interrupt signal increases, the probability that noise on

IRQA will generate multiple interrupts also increases.

While the DSP is in the Stop mode, asserting IRQA gates on

the oscillator and, after a clock stabilization delay, enables

clocks to the processor and peripherals. Hardware reset

causes this input to function as MODA.

Preliminary Information

1-6

DSP56011 Technical Data Sheet, Rev. 1

MOTOROLA

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