ADSP-218xN Series
Serial Ports
Table 20. Serial Ports
Parameter
Min
Max
Unit
Timing Requirements:
t
SCK
SCLK Period
t
SCS
DR/TFS/RFS Setup before SCLK Low
t
SCH
DR/TFS/RFS Hold after SCLK Low
SCLKIN Width
t
SCP
Switching Characteristics:
t
CC
CLKOUT High to SCLKOUT
t
SCDE
SCLK High to DT Enable
t
SCDV
SCLK High to DT Valid
t
RH
TFS/RFS
OUT
Hold after SCLK High
t
RD
TFS/RFS
OUT
Delay from SCLK High
DT Hold after SCLK High
t
SCDH
t
TDE
TFS (Alt) to DT Enable
t
TDV
TFS (Alt) to DT Valid
t
SCDD
SCLK High to DT Disable
t
RDV
RFS (Multichannel, Frame Delay Zero) to DT Valid
30
4
7
12
0.25t
CK
0
0
12
0
0
12
12
12
0.25t
CK
+ 6
12
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLKOUT
t
CC
t
CC
t
SCP
t
SCS
t
SCH
t
SCK
SCLK
t
SCP
DR
TFS
I N
RFS
IN
t
RD
t
RH
RFS
OUT
TFS
OUT
t
SCDV
t
SCDE
DT
t
SCDD
t
SCDH
t
TDE
t
TDV
TFS
OUT
ALTERNATE
FRAME
MODE
t
RDV
RFS
OUT
MULTICHANNEL
MODE,
FRAME DELAY 0
(MFD = 0)
t
TDE
t
TDV
TFS
IN
ALTERNATE
FRAME
MODE
t
RDV
RFS
IN
MULTICHANNEL
MODE,
FRAME DELAY 0
(MFD = 0)
Figure 29. Serial Ports
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