TDM Mode
C-8 ADSP-214xx SHARC Processor Hardware Reference
MOST Mode
A special packed TDM mode is available that allows four channels to be
fit into a space of 64-bit clock cycles. This mode is called packed TDM4
mode, or MOST™ mode. MOST (Media Oriented Systems Transport) is
a networking standard intended for interconnecting multimedia compo-
nents in automobiles and other vehicles. Many integrated circuits
intended to interface with a MOST bus use a packed TDM4 data format.
Figure C-3 illustrates a word length of 16 bits for a timing diagram of the
packed TDM4 mode. This figure is shown with a negative BCLK polarity, a
negative LRCLK polarity, and an MSB delay of 1. The MSB position of the
serial data must be delayed by one bit clock from the start of the frame
(I
2
S position).
Figure C-2. Packed I2S Mode
SLOT 1
LEFT 0
SLOT 2
LEFT 1
SLOT 3
LEFT 2
BLANK SLOT
4 SCLK
SLOT 4
RIGHT 0
SLOT 5
RIGHT 1
SLOT 6
RIGHT 2
BLANK SLOT
4 SCLK
DATA
20-BIT DATA
16-BIT DATA
BCLK
BCLK
MSB
–1
MSB
–2
MSB
–3
MSB
–4
MSB
–1
MSB
–2
MSB
–3
MSB
–4
LSB
+4
LSB
+3
LSB
+2
LSB
+1
MSB LSB
LSBMSB
L/RCLK
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