Specifications

Cinterion
®
PLSx3 Hardware Interface Description
2.1 Application Interface
66
t PLSx3_HID_v01.002d 2021-08-24
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The following figure shows an example of short frame PCM timing at 8kHz sample rate and
2048kHz PCM_CLK in the master mode:
Figure 15: PCM timing short frame
2.1.8.2 Inter-IC Sound Interface
The I
2
S Interface is a standardized bidirectio zonal I
2
S based digital audio interface for trans-
mission of mono voice signals for telephony services.
The I
2
S properties and capabilities comply with the requirements lay out in the Phillips I
2
S
Bus Specifications, revised June 5, 1996.
The I
2
S interface has the following characteristics:
• Bit clock mode: Master
• Sampling rate: 8kHz (narrowband), 16kHz (wideband)
• 256kHz bit clock at 8kHz sample rate
• 512kHz bit clock at 16kHz sample rate
Table 8 lists the available I
2
S interface signals
.
Table 8: Overview of I
2
S pin functions
Signal name on
SMT application
interface
Signal configura-
tion inactive
Signal direction
Master
Description
DOUT PD O I
2
S data from PLSx3 to external
codec
DIN PD I I
2
S data from external codec to
PLSx3
FSC PD O Frame synchronization signal to
external codec Word alignment
(WS)
BCLK PD O Bit clock to external codec.
BCLK signal low/high time varies
between 45% and 55% of its clock
period.
MSB
MSB
LSB
LSB
14 13
14 13
1
1
12
12
2
2
MSB
MSB
125 µs
PCMx_SYNC
PCMx_OUT
PCMx_IN
PCMx_CLK