![Analog Devices SHARC ADSP-21367 Скачать руководство пользователя страница 41](http://html1.mh-extra.com/html/analog-devices/sharc-adsp-21367/sharc-adsp-21367_manual_2939742041.webp)
ADSP-21367/ADSP-21368/ADSP-21369
Rev. D
|
Page 41 of 56
|
November 2008
S/PDIF Transmitter Input Data Timing
The timing requirements for the input port are given in
. Input signals SCLK, frame sync (FS), and SDATA are
routed to the DAI_P20–1 pins using the SRU. Therefore, the
timing specifications provided below are valid at the
DAI_P20–1 pins.
Oversampling Clock (TxCLK) Switching Characteristics
The S/PDIF transmitter has an oversampling clock. This TxCLK
input is divided down to generate the biphase clock.
Table 38. S/PDIF Transmitter Input Data Timing
Parameter
Min
Max Unit
Timing Requirements
t
SISFS
1
FS Setup Before SCLK Rising Edge
3
ns
t
SIHFS
1
FS Hold After SCLK Rising Edge
3
ns
t
SISD
1
SData Setup Before SCLK Rising Edge
3
ns
t
SIHD
1
SData Hold After SCLK Rising Edge
3
ns
t
SISCLKW
Clock Width
36
ns
t
SISCLK
Clock Period
80
ns
t
SITXCLKW
Transmit Clock Width
9
ns
t
SITXCLK
Transmit Clock Period
20
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 32. S/PDIF Transmitter Input Timing
DAI_P20
-
1
(
S
CLK)
DAI_P20
-
1
(F
S
)
S
AMPLE EDGE
t
S
I
S
D
t
S
I
S
F
S
t
S
I
S
CLKW
DAI_P20
-
1
(
S
DATA)
DAI_P20
-
1
(TXCLK)
t
S
IHD
t
S
IHF
S
t
S
ITXCLKW
t
S
ITXCLK
Table 39. Oversampling Clock (TxCLK) Switching Characteristics
Parameter
Min
Max
Unit
TxCLK Frequency for TxCLK = 384 × FS
73.8
MHz
TxCLK Frequency for TxCLK = 256 × FS
49.2
MHz
Frame Rate
192.0
kHz