AD73322L_17 datasheet(40/49 Pages) AD

Part #	AD73322L

Description	Low Cost, Low Power CMOS General-Purpose Dual Analog Front

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AD73322L

Rev. A | Page 39 of 48

At each occurrence of an SDOFS pulse, the DSP’s transmit

buffer contents are sent to the SDI pin of the AD73322L. This

also causes a subsequent DSP Tx interrupt which transfers the

initialization word, pointed to by the circular buffer pointer, to

the Tx buffer. The buffer pointer is updated to point to the next

unsent initialization word. When the circular buffer pointer

wraps around, which happens after the last word has been

accessed, it indicates that the initialization phase is complete.

This can be done manually in the DSP using a simple address

check, or autobuffered mode can be used to complete the

transfer automatically.

txcdat: ar = dm(stat_flag);

ar = pass ar;

if eq rti;

ena sec_reg;

ax0 = dm (i3, m1);

tx0 = ax0;

ax0 = i3;

ay0 = ^init_cmds;

ar = ax0 - ay0;

if gt rti;

ax0 = 0x00;

dm (stat_flag) = ax0;

rti;

In the main body of the program the code loops, waiting for the

initialization sequence to be completed.

check_init:

ax0 = dm (stat_flag);

af = pass ax0;

if ne jump check_init;

Because the AD73322L is effectively a cascade of two codec

units, it is important to observe the following restrictions in the

sequence of sending initialization words to the two codecs. It is

preferable to send pairs of control words for the corresponding

control registers in each codec, and it is essential to send the

control word for codec 2 before that for codec 1. Control

Registers A and B contain settings, such as sampling rate, serial

clock rate, etc., which critically require synchronous update in

both codecs.

Once the device has been initialized, Control Register A on

both codecs is written with a control word which changes the

operating mode from program mode to either data mode or

mixed control data mode. The device count field, which

defaults to 000b, must be programmed to 001b for a single

AD73322L device. In data mode or mixed mode, the main

function of the device is to return ADC samples from both

codecs and to accept DAC words for both codecs. During each

sample interval, two ADC samples are returned from the

device, while in the same interval two DAC update samples are

sent to the device. To reduce the number of interrupts and to

reduce complexity, autobuffering can be used to ensure that

only one interrupt is generated during each sampling interval.

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