Specifications

Product Technical Specification & Customer Design Guidelines
62 Proprietary and Confidential - Specifications subject to change 2400058
4.11 Digital audio interface (PCM)
The Digital Audio Interface (PCM) interface allows connectivity with standard
audio peripherals. It can be used, for example, to connect an external audio
codec. Tabl e 4- 3 1 describes the purpose and features of this interface.
The programmability of this interface allows addressing a large range of audio
peripherals.
4.11.1 PCM pin descriptions
Tabl e 4- 3 2 describes the digital audio (PCM) interface pins.
See Digital I/O electrical information on page 39 for 1V8 voltage characteristics
and reset state definitions.
Note: Note that the digital audio interface configuration cannot differ from this specifi-
cation.
Table 4-31: PCM audio interface features
Feature Details
Implementation • Primary PCM supported to interface with external codec
Power • 1.8 V (use VREF_1V8 as logic reference)
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 768 kHz only
• 16 bits data word MSB first only
• Linear Law only (no compression law)
• Long Frame Synchronization only
• Push-pull configuration on PCM_DOUT and PCM_DIN
Table 4-32: Audio pins
Pin Name I/O type
Reset state
a
Description Notes
64 PCM_SYNC PCM synchronization bit • Delivers 8 kHz frequency
pulse that synchronizes
frame data in/out.
65 PCM_DOUT PCM output • Frame ‘data out’ relies on
selected configuration mode.
66 PCM_DIN PCM input • Frame ‘data in’ relies on
selected configuration mode.
67 PCM_CLK PCM clock • 2 MHz for primary PCM
mode. Controls data transfer
with the audio peripheral.