WM8580AGEFT Wolfson Microelectronics Ltd., WM8580AGEFT Datasheet - Page 46
WM8580AGEFT
Manufacturer Part Number
WM8580AGEFT
Description
Multichannel Codec with S/pdif Transceiver
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet
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PRIMARY AUDIO INTERFACE TRANSMITTER (PAIF TX)
The PAIF Transmitter requires a left-right-clock (LRCLK) and a bit-clock (BCLK). These can be
supplied externally (slave mode) or they can be generated internally by the WM8580 (master mode).
The master mode LRCLK/BCLK are created by the Master Mode Clock Generator module. The
control of this module is described on page 22.
The clock supplied to this module can be ADCMCLK, PLLACLK, PLLBCLK, or MCLK and is selected
by the internal signal paiftxms_clksel’. If the PAIF Transmitter is sourcing the S/PDIF Receiver, it is
recommended that the interface operate in master mode. For this path, paiftxms_clksel selects
PLLACLK. For all other digital routing options, paiftxms_clksel automatically selects whichever clock
the adc_clk is using.
If in slave mode, and adc_clk is set to be MCLK, then the PAIFRX_BCLK is used as the BCLK for
the PAIF Transmitter.
Figure 30 PAIF Transmitter Clock Selection
SECONDARY AUDIO INTERFACES (SAIF RX & SAIF TX)
The Transmit and Receive sides of the Secondary Audio Interface share a common LRCLK and a
common BCLK. These can be supplied externally (slave mode) or they can be generated internally
by the WM8580 (master mode). The master mode LRCLK/BCLK are created by the Master Mode
Clock Gen module. The control of this module is described on page 22.
The clock supplied to this module can be ADCMCLK, PLLACLK, PLLBCLK, or MCLK and is selected
using the SAIFMS_CLKSEL register. If the digital routing has been configured such that the SAIF
Transmitter is sourcing the S/PDIF Receiver, then PLLACLK is automatically selected, and it is
recommended that the interface operate in master mode. However, if the SAIF Transmitter sources
something other than the S/PDIF Receiver, and the S/PDIF Receiver is powered up, the PLLACLK
and PLLBCLK are invalid for SAIF operation, so the choice is limited to MCLK (default) or
ADCMCLK.
PD Rev 4.3 August 2007
Production Data
46
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