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SLAS366 数据表(PDF) 20 Page - Texas Instruments |
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SLAS366 数据表(HTML) 20 Page - Texas Instruments |
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20 / 58 page  3–8 Master Slave2 Slave1 Slave0 Slave2 Master Master FS DIN/DOUT Master FSD, Slave 2 FS Slave 2 FSD, Slave 1 FS Slave 1 FSD, Slave 0 FS Slave 0 FSD, (see Note) NOTE: Slave 0 FSD should be pulled high for stand-alone-master or cascade configuration. FSD must be pulled low for stand-alone-slave configuration. Figure 3–8. Master-Slave Frame-Sync Timing in Continuous Data Transfer Mode 3.7 Host Port Interface The host port uses a 2-wire serial interface (SCL, SDA) to program the AIC14s six control registers and selectable protocol between S2C mode and I2C mode. The S2C is a write-only mode and the I2C is a read-write mode selected by setting the MSB (I2CSEL bit) of control register 4 to 1. If the host interface is not needed, the two pins of SCL and SDA can be programmed to become general-purpose I/Os by setting the MSB of the control register 4 to 0. If selected to be used as I/O pins, the SDA and SCL pins become output and input pins respectively, determined by D1 and D0. Both S2C and I2C require a SMARTDM device address to communicate with the AIC14. One of SMARTDMs advanced features is the automatic cascade detection (ACD) that enables SMARTDM to automatically detect the total number of codecs in the serial connection and use this information to assign each codec a distinct SMARTDM device address. Table 3–1 lists device addresses assigned to each codec in the cascade by the SMARTDM. The master always has the highest position in the cascade. For example, if there is a total of 8 codecs in the cascade (i.e., one master and 7 slaves), then the device addresses in row 8 are used in which the master is codec 7 with a device address of 0111. Table 3–1. SMARTDM Device Addresses TOTAL CODECS CODECs POSITION IN CASCADE CODECS 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 0000 2 0001 0000 3 0010 0001 0000 4 0011 0010 0001 0000 5 0100 0011 0010 0001 0000 6 0101 0100 0011 0010 0001 0000 7 0110 0101 0100 0011 0010 0001 0000 8 0111 0110 0101 0100 0011 0010 0001 0000 9 1000 0111 0110 0101 0100 0011 0010 0001 0000 10 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 11 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 12 1011 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 13 1100 1011 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 14 1101 1100 1011 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 15 1110 1101 1100 1011 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 16 1111 1110 1101 1100 1011 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000 |
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