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AD73322L Datasheet(PDF) 40 Page - Analog Devices |
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AD73322L Datasheet(HTML) 40 Page - Analog Devices |
40 / 49 page 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. |
Similar Part No. - AD73322L_17 |
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Similar Description - AD73322L_17 |
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