User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 79 of 124 2019-07-15
Audio Interface
The LE910Cx module supports a digital audio interface.
8.6.1. Digital Audio
The LE910Cx module can be connected to an external codec through the digital interface.
The product provides a single Digital Audio Interface (DVI) on the following pins:
Table 31: Digital Audio Interface (DVI) Signals
PAD
Signal
I/O
Function
Type
Comments
B9
DVI_WA0
O
Digital Audio Interface (WA0)
B-PD 1.8V
PCM_SYNC
B6
DVI_RX
I
Digital Audio Interface (RX)
B-PD 1.8V
PCM_DIN
B7
DVI_TX
O
Digital Audio Interface (TX)
B-PD 1.8V
PCM_DOUT
B8
DVI_CLK
O
Digital Audio Interface (CLK)
B-PD 1.8V
PCM_CLK
B12
REF_CLK
O
Audio Master Clock
B-PD 1.8V
I2S_MCLK
LE910Cx DVI has the following characteristics:
• PCM Master and slave modes using short or long frame sync modes
• 16-bit linear PCM format
• PCM clock rates of 256 kHz, 512 kHz, 1024 kHz and 2048 kHz (Default)
• Frame size of 8, 16, 32, 64, 128 & 256 bits per frame
• Sample rates of 8 kHz and 16 kHz
In addition to the DVI port, the LE910Cx module provides a master clock signal
(REF_CLK on Pin B12) which can either provide a reference clock to an external codec or
form an I2S interface together with the DVI port where the REF_CLK acts as the
I2S_MCLK.
The REF_CLK default frequency is 12.288 MHz.
When using the DVI with REF_CLK as an I2S interface, 12.288 MHz is 256 x fs (where fs
= 48 kHz)