Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
3.19 Digital Audio Interface (PCM)
The Digital audio interface (PCM) interface mode allows the connectivity with audio
standard peripherals. It can be used, for example, to connect an external audio codec.
The programmability of this mode allows to address a large range of audio
peripherals.
3.19.1 Features
•
IOM-2 compatible device on physical level
• Master mode only with 6 slots by frame, user only on slot 0
• Bit rate single clock mode at 768KHz only
• 16 bits data word MSB first only
• Linear Law only (no compression law)
• Long Frame Synchronization only
• Push pull configuration on PCM-OUT and PCM-IN
The digital audio interface configuration cannot be different from the specified
features above.
AC characteristics
Signal Description Minimum Typ Maximum Unit
Tsync_low +
Tsync_high
PCM-SYNC period 125 μs
Tsync_low PCM-SYNC low time 93 μs
Tsync_high PCM-SYNC high time 32 μs
TSYNC-CLK PCM-SYNC to PCM-CLK time -154 ns
TCLK-cycle PCM-CLK period 1302 ns
TIN-setup PCM-IN setup time 50 ns
TIN-hold PCM-IN hold time 50 ns
TOUT-delay PCM-OUT delay time 20 ns
PCM interface consists of 4 wires:
• PCM-SYNC (output): The frame synchronization signal delivers an 8 kHz
frequency pulse that synchronizes the frame data in and the frame data out.
• PCM-CLK (output): The frame bit clock signal controls the data transfer with
the audio peripheral.
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WA_DEV_Q64_PTS_001-003 January 9, 2009