Datasheet

789
42023E–SAM–07/2013
ATSAM4L8/L4/L2
• TXSAME: Transmit Data when Underrun
0: Zero sample transmitted when underrun.
1: Previous sample transmitted when underrun
• TXDMA: Single or multiple DMA Channels for Transmitter
0: Transmitter uses a single DMA channel for both
audio channels.
1: Transmitter uses one DMA channel per audio channel.
• TXMONO: Transmit Mono
0: Stereo.
1: Mono, with left audio samples duplicated to right audio channel by the IISC.
• RXLOOP: Loop-back Test Mode
0: Normal mode.
1: ISDO output of IISC is internally connected to ISDI input.
• RXMONO: Receive Mono
0: Stereo.
1: Mono, with left audio samples duplicated to right audio channel by the IISC.
• RXDMA: Single or multiple DMA Channels for Receiver
0: Receiver uses a single DMA channel for both audio channels.
1: Receiver uses one DMA channel per audio channel.
• DATALENGTH: Data Word Length
•MODE: Mode
384 fs 23
512 fs 31
768 fs 47
1024 fs 63
Table 29-5. Data Word Length
DATALENGTH Word Length Comments
0 32 bits
1 24 bits
2 20 bits
3 18 bits
4 16 bits
5 16 bits compact stereo Left sample in bits 15 through 0 and right sample in bits 31 through 16 of the same word
6 8 bits
7 8 bits compact stereo Left sample in bits 7 through 0 and right sample in bits 15 through 8 of the same word
Table 29-6. Mode
MODE Comments
0 SLAVE ISCK and IWS pin inputs used as Bit Clock and Word Select/Frame Sync.
1 MASTER
Bit Clock and Word Select/Frame Sync generated by IISC from GCLK_IISC and output to ISCK and IWS pins.
GCLK_IISC is output as Master Clock on IMCK if MR.IMCKMODE is one.
Table 29-4. Master Clock to Sample Frequency (fs) Ratio
fs Ratio IMCKFS