ADSP-2171 Ver la hoja de datos (PDF) - Analog Devices

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ADSP-2171

DSP Microcomputer

Analog Devices 

ADSP-2171/ADSP-2172/ADSP-2173

Example Code

The following example is a code fragment that performs the

filter tap update for an adaptive (least-mean-squared algorithm)

filter. Notice that the computations in the instructions are

written like algebraic equations.

MF=MX0*MY1 (RND), MX0=DM (I2,M1); /* MF=error*beta */

MR=MX0*MF (RND), AY0=PM (I6,MS);

DO adapt UNTIL CE;

AR=MR1 + AY0, MX0=DM (I2,M1), AY0=PM (I6,M7);

adapt: PM(I6,M6) =AR, MR=MX0*MF (RND);

MODIFY (I2, M3);

/* Point to oldest data */

MODIFY (I6, M7);

/* Point to start of data */

Interrupt Enable

The ADSP-217x supports an interrupt enable instruction. Inter-

rupts are enabled by default at reset. The instruction source

code is specified as follows:

Syntax:

ENA INTS;

Description: Executing the ENA INTS instruction allows all

unmasked interrupts to be serviced again.

Interrupt Disable

The ADSP-217x supports an interrupt disable instruction. The

instruction source code is specified as follows:

Syntax:

DIS INTS;

Description: Reset enables interrupt servicing. Executing the

DIS INTS instruction causes all interrupts to be

masked without changing the contents of the

IMASK register. Disabling interrupts does not

affect the autobuffer circuitry, which will operate

normally whether or not interrupts are enabled.

The disable interrupt instruction masks all user

interrupts including the powerdown interrupt.

–16–

REV. A

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