Cypress S6J3200 Series, Manual

Page: 1304 / 1355

CHAPTER 34:Sound System Configuration
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 1303
3.3.
Stop Operations
Take the following procedure of 3.3.1 to 3.3.3 to stop the operation of the sound system.
3.3.1.
Disabling the Output Module
Disable the output module. The procedure is described in the chapter of the audio-DAC, PCM-PWM and
I2S in detailed.
Notes:
−
When the PCM-PWM or I2S is used as output module and the output module is changed from
"enabled" to "disabled" (*1), the sound mixer should not be disabled and the output module
should not be enabled during 16 sampling cycles. If this sequence is not followed, PCM data
requested before disabling the output module may be transferred to the output module after
enabling the output module. This may cause the DMA block error, Tx Block Size Error or FIFO
overflow error.
−
(*1) In PCM-PWM case, this means that the global enable bit (PCMPWMi_CONTROL,EN) is
changed from 1 to 0.
−
(*1) In I2S case, this means that the transmission enable bit (I2Sn_OPRREG:TXENB) or the I2S
enable bit (I2Sn_OPRREG.START) is changed from 1 to 0.
3.3.2.
Disabling the Mixing
Disable the mixing operations of SMIX. The procedure is described in the chapter of SMIX in detailed.
3.3.3.
Disabling the Input Modules
Disable the sound source generations and transmissions. The procedure is described in the chapter of
DMA, interrupt and I2S in detailed.