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PCM1796 数据表(PDF) 50 Page - Burr-Brown (TI) |
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PCM1796 数据表(HTML) 50 Page - Burr-Brown (TI) |
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50 / 57 page  PCM1796 SLES100 − DECEMBER 2003 www.ti.com 50 LRCK BCK DI CMD Don’t Care Ch1 CMD CMD Ch2 Ch3 Ch1 Ch4 IN and OUT Channel Orders are Completely Independent DO 7 Packets × 32 Bits Ch5 Ch6 1/fS (256 BCK Clocks) Ch2 Figure 58. TDMCA Frame Example of 6-Ch DAC and 2-Ch ADC With Command Read Command Field The normal command field is defined as follows. When the DID bit (MSB) is 1, this frame is used only for device ID determination, and all remaining bits in the field are ignored. 31 30 29 28 24 23 22 16 15 8 7 0 command DID EMD DCS device ID R/W register ID data not used Bit 31: Device ID enable flag The PCM1796 operates to get its own device ID for TDMCA initialization if this bit is HIGH. Bit 30: Extended command enable flag The EMD packet is transferred if this bit is HIGH, otherwise skipped. Once this bit is HIGH, this frame does not contain any audio data. This is for system initialization. Bit 29: Daisy chain selection flag HIGH designates OUT-chain devices, LOW designates IN-chain devices. The PCM1796 is an IN device, so the DCS bit must be set to LOW. Bits[28:24]: Device ID The device ID is 5 bits length, and it can be defined. These bits identify the order of a device in the IN or OUT daisy chain. The top of the daisy chain defines device ID 1 and successive devices are numbered 2, 3, 4, etc. All devices for which the DCI is fixed HIGH are also defined as ID 1. The maximum device ID is 30 each in the IN and OUT chains. If a device ID of 0x1F is used, all devices are selected as broadcast when in the write mode. If a device ID of 0x00 is used, no device is selected. Bit 23: Command Read/Write flag If this bit is HIGH, the command is a read operation. Bits[22:16]: Register ID It is 7 bits in length. Bits[15:8]: Command data It is 8 bits in length. Any valid data can be chosen for each register. Bits[7:0]: Not used These bits are never transported when a read operation is performed. Extended command field The extended command field is the same as the command field, except that it does not have a DID flag. 31 30 29 28 24 23 22 16 15 8 7 0 extended command rsvd EMD DCS device ID R/W register ID data not used |
类似零件编号 - PCM1796 |
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类似说明 - PCM1796 |
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