EVM操作

　　The EVM is shipped from the factory in master/slave cascade mode. To check　if the EVM is working properly， simply install the EVM onto the development　platform and apply power to the DSK. The EVM should begin working　immediately.

　　In the default mode， the codecs recognize that there are four discrete　channels， consequently the resultant SCLK and FS signals transmitted by the　master codec adjust automatically based on the available MCLK.

　　It is now possible to calculate what should be observed after power up by　calculating what FS and SCLK should be observed：

　　: FS

　　 In this example， MCLK is generated by the development platform and

　　is equal to 100 MHz.

　　 FS = MCLK/16 × m × n × p

　　 Default values for m， n， and p are 16， 6， and 8 respectively

　　 FS = 100×106 /16 ×16 × 6 × 8

　　 FS = 8138 kHz

　　: SCLK

　　 SCLK = 16 × FS × （number of devices） × 2

　　 SCLK = 16 × 8138 × 4 × 2

　　 SCLK = 1.04 MHz

　　FS can be observed either directly at the FS pin of U1 or U2 （pin 19） or on the

　　development platform at TP9. SCLK can be observed easily at P1 pin 3 of the

　　EVM or on the development platform at TP8.