Texas Instruments TLV320AIC20KEVM, Руководство пользователя, Страница: 18 / 25

4-1
EVM Operation
EVM Operation
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
J
In this example, MCLK is generated by the development platform and
is equal to 100 MHz.
J
FS = MCLK/16
×
m
×
n
×
p
J
Default values for m, n, and p are 16, 6, and 8 respectively
J
FS = 100 × 10
6
/16 × 16 × 6 × 8
J
FS = 8138 kHz
-
SCLK
J
SCLK = 16 × FS × (number of devices) × 2
J
SCLK = 16 × 8138 × 4 × 2
J
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.
Chapter 4