YSS915 Datasheet, PDF (29/32 Pages) YAMAHA CORPORATION – Karaoke Processor 2 for Video disc player

YSS915
A procedure to change Normal mode to Through-mode
Normal mode means that it can apply the sound effect using internal DSP function and the sampling frequency is
between 32kHz and 48kHz in this mode.
Through-mode means that the digital input data fed to YSS915 is bypassed to digital output pin without processing
by DSP and the sampling frequency is 64kHz to 96kHz.
For example, when the sampling frequency is changed from 48kHz( called fs-single) to 96kHz( called fs-double),
master clock frequency fed to XI pin of YSS915 may be changed according to the fs(sampling frequency).
In this case please refer to the following procedure.
A. Change Normal mode (fs-single) to Through-mode (fs-double)
1.Mute Analog output of the product
2.Set /IC=”0” of YSS915
3.Change the master clock frequency (XI of YSS915) from “single “ to “double”
4.Wait 2msec or more
5.Set /IC=”1”
6.Set the parameters from the microprocessor to YSS915 as followed
opr [7:0] = 8’bxx00x0x1
mdr [7:0] = 8’b01100000
dar [7:0] = 8’b10xx01xx or 8’b10xx10xx or 8’b10xx11xx
x means don’t care
7.Disable to mute Analog output of the product
Mute of Analog out
/IC of YSS915
XI of YSS915
Setting from microprocessor
to YSS915
single
mute
double
2msec min
setting
B. Change Through-mode (fs-double) to Normal mode (fs-single)
1.Mute Analog output of the product
2.Set /IC=”0” of YSS915
3.Change the master clock frequency (XI of YSS915) from “double“ to “single”
4.Wait 2msec or more
5.Set /IC=”1”
6.Set the parameters from the microprocessor to YSS915 as the same way after power on
Mute of Analog out
mute
/IC of YSS915
XI of YSS915
double
single
Setting from microprocessor
to YSS915
2msec min
setting
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