 |
 |
|
| AK4128A |
|
|||||||||||||||||
 AKM
|
| |||||||||||||||||
|
20 page 
[AK4128A] MS1242-E-00 2010/09 - 20 - OPERATION OVERVIEW ■ Synchronous and Asynchronous Modes Setting There are two modes of operation: asynchronous and synchronous modes. The AK4128A is set to Synchronous mode when the INAS pin is “L” and it is set to Asynchronous mode when the INAS pin is “H”. FSI pin Mode Data LRCK BICK SDTI1 SDTI2 SDTI3 L Synchro nous SDTI4 ILRCK1 IBICK1 SDTI1 ILRCK1 IBICK1 SDTI2 ILRCK2 IBICK 2 SDTI3 ILRCK3 IBICK 3 H Asynchr onous SDTI4 ILRCK4 IBICK 4 Note 21. ILRCK2-4 pins must be connected to VSS2-5. Note 22. IBICK2-4 pins must be connected to VSS2-5. Table 1. Input Data Synchronous/Asynchronous Mode Setting ■ Audio Interface Format for Input PORT The audio data format of input port is MSB first, 2’s complement format. The SDTI1, SDTI2, SDTI3 and SDTI4 are latched on the rising edge of IBICK1, IBICK2, IBIXK3 and IBICK4 respectively. In parallel control mode (SPB pin= “L”), IDIF2-0 pins control all audio interface formats of SRC1~4. IDIF2-0 pins must be set during the PDN pin= “L”. In serial control mode (SPB pin = “H”), setting of IDIF2-0 pins is ignored. IDIF[12:10] bits setting is reflected to SRC1, IDIF[22:20] bits setting is reflected to SRC2, IDIF[32:30] bits setting is reflected to SRC3, and IDIF[42:40] bits setting is reflected to SRC4. IDIF[12:10] bits should be changed after all SDTO1 output codes become zero during soft mute by SMUTE1 bit = “1” or the SMUTE pin = “H”. IDIF[22:20] bits should be changed after all SDTO2 output codes become zero during soft mute by SMUTE2 bit = “1” or the SMUTE pin = “H”. IDIF[32:30] bits should be changed after all SDTO3 output codes become zero during soft mute by SMUTE3 bit = “1” or the SMUTE pin = “H”. IDIF[42:40] bits should be changed after all SDTO4 output codes become zero during soft mute by SMUTE4 bit = “1” or the SMUTE pin = “H”. TDM mode (Mode 5/6) can be set in Synchronous Inputs mode (INAS pin = “L”). Serial data for 8channels should be input from the SDTI1 pin. In this mode, connect SDTI2-4 pins to VDD2-5 because there pins are ignored. Asynchronous Inputs mode (INAS pin = “H”) does not support TDM mode. The AK4128A is not able to operate correctly because of SDTI1-4 data inputs are incorrect. TDM mode is must be OFF, when using the AK4128A in asynchronous inputs mode (INAS pin = “H”). The maximum input frequency of IBICK1-4 is 256FSI. |
