AD28MSP02 datasheet(5/20 Pages) AD

5 / 20 page

AD28msp02

REV. 0

–5–

Note that the ADSP-2101’s SPORT0 communicates with the

AD28msp02’s SPORT while the ADSP-2101’s Flag Output

(FO) is used to signal the AD28msp02’s DATA/CNTRL input.

SPORT1 on the ADSP-2101 must be configured for flags and

interrupts in this system.

Figure 6 shows an ADSP-2101 assembly language program that

initializes the AD28msp02 and implements digital loopback

through the DSP processor.

SDO

SDOFS

SCLK

DATA/CNTRL

SDI

SDIFS

AD28msp02

DR0

RFS0

SCLK0

DT0

TFS0

ADSP-2101

Figure 5. AD28msp02-to-ADSP-2101 Interface

{ This ADSP-2101 program initializes the AD28msp02 }

{ and executes a loopback, or talk-through, routine. }

.MODULE/ABS = 0/BOOT = 0 test1;

resetv:

JUMP begin;

{restart}

RTI; RTI; RTI;

irq2v:

RTI; RTI; RTI; RTI;

{IRQ2}

st0x:

RTI; RTI; RTI; RTI;

{SPORT0 Tx}

sr0x:

ax0 = rx0;

{SPORT0 Rx}

tx0 = ax0;

RTI; RTI;

irq1v:

RTI; RTI; RTI; RTI;

{irq1}

irq0v:

RTI; RTI; RTI; RTI;

{irq0}

timerv:

RTI; RTI; RTI; RTI;

begin:

RESET FLAG OUT;

AX0 = 0x2A0F;

{Configure ADSP-2101 SPORT0 for }

DM (0x3FF6) = AX0;

{ ext. SCLK, ext. RFS, int. TFS }

AX0 = 0x101F;

{ Enable ADSP-2101 SPORT0, }

DM (0x3FFF) = AX0;

{ configure SPORT1 for Flag Out }

IMASK= 0x10;

AX0 = 0x30;

{ Write control word to take}

TX0 = AX0;

{ AD28msp02 out of powerdown }

IDLE;

NOP;

IMASK= 0x08;

SET FLAG OUT;

wait:

JUMP wait;

{ Wait for receive interrupt }

NOP;

.ENDMOD;

Figure 6. ADSP-2101 Digital Loopback Routine

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