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Rev. D
|
Page 38 of 56
|
November 2008
ADSP-21367/ADSP-21368/ADSP-21369
Pulse-Width Modulation Generators
Sample Rate Converter—Serial Input Port
The SRC input signals SCLK, frame sync (FS), and SDATA are
routed from the DAI_P20–1 pins using the SRU. Therefore, the
timing specifications provided in
are valid at the
DAI_P20–1 pins.
Table 35. PWM Timing
Parameter
Min
Max Unit
Switching Characteristics
t
PWMW
PWM Output Pulse Width
t
PCLK
– 2
(2
16
– 2) × t
PCLK
– 2
ns
t
PWMP
PWM Output Period
2 × t
PCLK
– 1.5
(2
16
– 1) × t
PCLK
– 1.5
ns
Figure 26. PWM Timing
PWM
OUTPUT
S
t
PWMW
t
PWMP
Table 36. SRC, Serial Input Port
Parameter
Min
Max Unit
Timing Requirements
t
SRCSFS
1
FS Setup Before SCLK Rising Edge
4
ns
t
SRCHFS
1
FS Hold After SCLK Rising Edge
5.5
ns
t
SRCSD
1
SDATA Setup Before SCLK Rising Edge
4
ns
t
SRCHD
1
SDATA Hold After SCLK Rising Edge
5.5
ns
t
SRCCLKW
Clock Width
(t
CCLK
× 8) ÷ 2 – 1
ns
t
SRCCLK
Clock Period
t
CCLK
× 8
ns
1
DATA, SCLK, FS can come from any of the DAI pins. SCLK and FS can also come via PCG or SPORTs. PCG’s input can be either CLKIN or any of the DAI pins.
Figure 27. SRC Serial Input Port Timing
DAI_P20
-
1
(
S
CLK)
DAI_P20
-
1
(F
S
)
S
AMPLE EDGE
t
S
RC
S
F
S
t
S
RCHF
S
t
S
RCCLK
DAI_P20
-
1
(
S
DATA)
t
S
R CCLKW
t
S
RC
S
D
t
S
RCHD