10 switching characteristics - serial port – Cirrus Logic CS61884 User Manual
Page 61
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CS61884
DS485F3
61
19.10 Switching Characteristics - Serial Port
Notes: 23. If SPOL = 0, then CS should return high no sooner than 20 ns after the 16
th
rising edge of SCLK during
a serial port read.
Parameter
Symbol
Min.
Typ.
Max
Unit
SDI to SCLK Setup Time
t
dc
-
20
-
ns
SCLK to SDI Hold Time
t
cdh
-
20
-
ns
SCLK Low Time
t
cl
-
50
-
ns
SCLK High Time
t
ch
-
50
-
ns
SCLK Rise and Fall Time
t
r
, t
f
-
15
-
ns
CS to SCLK Setup Time
t
cc
-
20
-
ns
SCLK to CS Hold Time
Note
t
cch
-
20
-
ns
CS Inactive Time
t
cwh
-
70
-
ns
SDO Valid to SCLK
Note
t
cdv
-
60
-
ns
CS to SDO High Z
t
cdz
-
50
-
ns
CS
SDI
SCLK
SDO
CLKE=1
LAST ADDR BIT
SDO
CLKE=0
HIGH Z
t
cdv
t
cdv
t
cdz
D0
D1
D0
D6
D1
D6
D7
D7
Figure 24. Serial Port Read Timing Diagram
CS
SCLK
t
cc
SDI
LSB
LSB
MSB
t
ch
t
cl
t
cch
t
cwh
t
dc
t
cdh
t
cdh
Figure 25. Serial Port Write Timing Diagram
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