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ADSP-21367/ADSP-21368/ADSP-21369
Rev. D
|
Page 39 of 56
|
November 2008
Sample Rate Converter—Serial Output Port
For the serial output port, the frame-sync is an input and it
should meet setup and hold times with regard to SCLK on the
output port. The serial data output, SDATA, has a hold time
and delay specification with regard to SCLK. Note that SCLK
rising edge is the sampling edge and the falling edge is the
drive edge.
Table 37. SRC, Serial Output 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
SRCCLKW
Clock Width
(t
CCLK
× 8) ÷ 2 – 1
ns
t
SRCCLK
Clock Period
t
CCLK
× 8
ns
Switching Characteristics
t
SRCTDD
1
Transmit Data Delay After SCLK Falling Edge
9.9
ns
t
SRCTDH
1
Transmit Data Hold After SCLK Falling Edge
1
ns
1
DATA, SCLK, and 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 28. SRC Serial Output Port Timing
DAI_P20
-
1
(
S
CLK)
DAI_P20
-
1
(F
S
)
t
S
RC
S
F
S
t
S
RCHF
S
DAI_P20
-
1
(
S
DATA)
t
S
RCTDD
t
S
RCTDH
S
AMPLE EDGE
t
S
RCCLK
t
S
RCCLKW