REV. 0

EVAL-AD1852EB

–6–

MODCLK

pin 40;

/

/Clocks in serial mode codes

MODSTM

pin 37;

/

/Serial mode code stream from CPU

“OUTPUTS ———————————————————————————————————

//

TDO

pin 29;

//JTAG O/P

M0, M1, M2

pin 3, 2, 18 istype ‘com’;

//DIR Mode Select

IDPM0, IDPM1

pin 35, 36 istype ‘com’;

//DAC Mode Select

MCLK, BCLK, LRCLK

pin 30, 32, 33 istype ‘com’;

//DAC Digital Data

SDATA

pin 31 istype ‘com’;

MCLKO

pin 23 istype ‘com’;

//Ext MCLK Drive

DEEMPH

pin 25 istype ‘com’;

//DAC Deemphasis Control

NLVERF, NLZL, NLZR, NLDEEMPH

pin 11, 21, 22, 20 istype ‘com’; //LED Status Drive

ESDATA, ELRCLK, EBCLK

pin 43, 42, 41 istype ‘com’;

//External Data I/Os

// Registers for delaying the data in RJ and DSP modes

// such that it is output in the correct format

// to match the signal requirements for the AD1852.

“NODES

QA, QB, QC, QD, QE, QF

node istype ‘reg, buffer’;

QG, QH, QI, QJ, QK, QL

node istype ‘reg, buffer’;

Q20, Q24

node istype ‘reg, buffer’;

QDSP

node istype ‘reg, buffer’;

// Shift register for reading/holding mode codes

// streaming in from CPU’s LabView control program.

QM0, QM1, QM2, QM3

node istype ‘reg, buffer’;

“MACROS

// S5 position 4, External Mode Control

XMODC

= (!SLCT_C &

SLCT_B &

SLCT_A);

//EQUATIONS

// S5 position 0, LabView selection 1, LJ, Invert DIR BCLK

LJ

=

( SLCT_C &

SLCT_B &

SLCT_A)

# ( XMODC & (

(!QM3 &

QM2 & !QM1 &

QM0)

# ( QM3 & !QM2 &

QM1 & !QM0) ) );

// S5 position 1, LabView selection 2, I2S

I2S

=

( SLCT_C &

SLCT_B & !SLCT_A)

# ( XMODC & (

(!QM3 &

QM2 &

QM1 &

QM0)

# ( QM3 &

QM2 &

QM1 & !QM0)

# ( QM3 &

QM2 & !QM1 &

QM0)

# ( QM3 & !QM2 &

QM1 &

QM0) ) );

// S5 position 2, LabView selection 4, RJ_24, 24-Bit

RJ_24

=

( SLCT_C & !SLCT_B &

SLCT_A)

# ( XMODC & (

(!QM3 & !QM2 & !QM1 &

QM0)

# (!QM3 & !QM2 &

QM1 & !QM0)

# (!QM3 &

QM2 & !QM1 & !QM0)

# ( QM3 & !QM2 & !QM1 & !QM0) ) );

// S5 position 3, LabView selection 3, DSP WSync, Delay SDATA

DSP

=

( SLCT_C & !SLCT_B & !SLCT_A)

# ( XMODC & (!QM3 & !QM2 & !QM1 & !QM0) );

// LabView selection 5, RJ_20, 20-Bit

RJ_20

= ( XMODC & (

(!QM3 & !QM2 &

QM1 &

QM0)

# (!QM3 &

QM2 &

QM1 & !QM0)

# ( QM3 &

QM2 & !QM1 & !QM0)

# ( QM3 & !QM2 & !QM1 &

QM0) ) );