N27 Hardware User Guide
Chapter 4 Application Interfaces
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33
t(clkl)
PCM_CLK low time
/
244
/
ns
t(susync)
Set-up
time
from
PCM_SYNC high to
PCM_CLK low
/
122
/
ns
t(sudin)
Set-up
time
from
PCM_DIN high to
PCM_CLK low
60
/
/
ns
t(hdin)
Hold
time
from
PCM_CLK low to
PCM_DIN high
10
/
/
ns
t(pdout)
Delay
time
from
PCM_CLK high to
PCM_DOUT low
/
/
60
ns
t(zdout)
Delay
time
from
PCM_CLK low to
PCM_DOUT
high
impedance
/
160
/
ns
N27 provides one I2S interface, which is multiplexed from PCM. It operates at 1.8 V and can be used
for digital audio.
Signal
Pin
I/O
Function
Remarks
I2S_MCLK
19
DO
I2S main clock
Max. frequency: 12.288MHz
I2S_TX
17
DO
I2S data transmit
Multiplexed as PCM_DOUT
I2S_RX
16
DI
I2S data receive
Multiplexed as PCM_DIN
I2S_WS
15
B
I2S word select
Multiplexed as PCM_SYNC
I2S_SCLK
18
DO
I2S serial clock
Multiplexed as PCM_CLK
Figure 4-14 shows the reference design of the I2S interface.
