Siemens S50037 ユーザーズマニュアル
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SieMo S50037 Data Book
PRELIMINARILY
17/30
PCM Timing
Symbol
Parameter
Min
Typ
Max
Unit
f
CLK
PCM clock frequency
256
kHz
(1)
Clock duty cycle
50
%
t
sy:hd
Hold time from CLK low to SYNC high
1.95
us
t
sy:su
Set-up time for SYNC high to CLK low
1.95
us
t
sdat:dt
Delay time from CLK to valid MSB data
50
ns
t
dat:dt
Delay time from CLK high to PCM_OUT
valid data
valid data
50
ns
t
fdat:dt
Delay time from SYNC or CLK, whichever
is later, to PCM_OUT data line high
impedance
is later, to PCM_OUT data line high
impedance
300
ns
t
sy:low
Hold time from 2nd CLK to SYNC low
300
1
ns
t
dr:su
Set-up time for PCM_IN valid to CLK low
300
1
ns
tdr:hd
Hold time for CLK low to PCM_IN invalid
300
1
ns
figure 12 PCM Master Timing
9
Assumes normal system clock operation. Figures may vary during low power modes
when system clock speeds are reduced.