WM8580
Production
Data
w
PD, Rev 4.7, March 2009
24
REGISTER
ADDRESS
BIT LABEL
DEFAULT DESCRIPTION
R9
PAIF 1
09h
4:3 PAIFRX_BCLKSEL
[1:0]
00
R10
PAIF 2
0Ah
4:3 PAIFTX_BCLKSEL
[1:0]
00
R11
SAIF 1
0Bh
4:3 SAIF_BCLKSEL
[1:0]
00
Master Mode BCLK Rate:
00 = 64 BCLKs per LRCLK
01 = 32 BCLKs per LRCLK
10 = 16 BCLKs per LRCLK
11 = BCLK = System Clock.
Table 15 Master Mode BCLK Control
AUDIO DATA FORMATS
Five popular interface formats are supported:
•
Left Justified mode
•
Right Justified mode
•
I
2
S mode
•
DSP Mode A
•
DSP Mode B
All five formats send the MSB first and support word lengths of 16, 20, 24 and 32 bits, with the
exception of 32 bit right justified mode, which is not supported.
Audio Data for each stereo channel is time multiplexed with the interface’s Left-Right-Clock (LRCLK),
indicating whether the left or right channel is present. The LRCLK is also used as a timing reference
to indicate the beginning or end of the data words.
In Left Justified, Right Justified and I
2
S modes, the minimum number of BCLKs per LRCLK period is
2 times the selected word length. LRCLK must be high for a minimum of BCLK periods equivalent to
the audio word length, and low for minimum of the same number of BCLK periods. Any mark to
space ratio on LRCLK is acceptable provided these requirements are met.
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