Table of Contents
Advertisement
Operating Modes
SPORTX_CLK
SPORTx_FS/WS
LEFT-JUSTIFIED MODE
LSB n-1
SPORTx_DA/DB DATA
SAMPLE n-1
Figure 6-5. Word Select Timing in Left-justified Mode
2
I
S Mode
2
I
S mode is a three-wire serial bus standard protocol for transmission of
two-channel (stereo) pulse code modulation (PCM) digital audio data.
For more information, see Appendix C, Audio Frame Formats.
2
The I
S bus transmits audio data and control signals over separate lines.
The data line carries two multiplexed data channels—the left channel and
the right channel. In I
transmit, then SPORT transmit channels (
simultaneously, each transmitting left and right I
channels on a SPORT are set up to receive, the SPORT receive channels
(
and
RXSPxA
RXSPxB
2
I
S channels. Data is transmitted in MSB-first format.
The SPORTs are designed so that in I
(used as an edge sensitive signal to select between left and right
channel) is held at the last driven logic level and does not transi-
tion, to provide an edge, after the final data word is driven out.
Therefore, while transmitting a fixed number of words to an I
receiver that expects an
data word, the SPORT should send a dummy word after
6-38
www.BDTIC.com/ADI
MSB n
SAMPLE n
2
S mode, if both channels on a SPORT are set up to
) receive simultaneously, each receiving left and right
SPORTx_FS
ADSP-2136x SHARC Processor Hardware Reference
for the ADSP-21362/3/4/5/6 Processors
LSB n
MSB n+1
SAMPLE n +1
and
TXSPxA
TXSPxB
2
S channels. If both
2
S master mode,
edge to receive the incoming
) transmit
SPORTx_FS
2
S
Advertisement
Table of Contents
