參數(shù)資料
型號(hào)： CS1311
文件頁(yè)數(shù)： 18/25頁(yè)
文件大?。?/td> 542K
代理商： CS1311
www.national.com
18
Revision 2.2
G
Signal Definitions
(Continued)
2.2.6
Audio In Interface Signals
Signal Name
Ball
No.
Type
Description
AI_OSCLK
B15
O
Over-Sampling Clock.
This output can be programmed to emit any fre-
quency up to 40 MHz with a sub-Hertz resolution. It is intended for use
as the 256f
s
or 384f
s
over-sampling clock by external A/D subsystem. A
board level 27 to 33
series resistor is recommended to reduce ringing.
AI_SCK
A16
I/O
Serial Clock.
When the AI module is programmed as a serial-interface
timing slave (power-up default), AI_SCK is an input. AI_SCK receives
the serial bit clock from the external A/D subsystem. This clock is treated
as fully asynchronous to the CS1301/CS1311 main clock.
When the AI module is programmed as the serial-interface timing mas-
ter, AI_SCK is an output. AI_SCK drives the serial clock for the external
A/D subsystem. The frequency is a programmable integral divisor of the
AI_OSCLK frequency.
AI_SCK is limited to 22 MHz. The sample rate of valid samples embed-
ded within the serial stream is variable. If used as an output, a board
level 27 to 33
series resistor is recommended to reduce ringing.
AI_SD
C15
I
Serial Data
. Serial data from external A/D subsystem. Data on this pin is
sampled on positive or negative edges of AI_SCK as determined by the
CLOCK_EDGE bit in the AI_SERIAL register.
AI_WS
B16
I/O
Word-Select.
AI_WS is the word-select or frame-synchronization signal
from/to the external A/D subsystem.
When the AI module is programmed as the serial-interface timing slave
(power-up default), AI_WS acts as an input. AI_WS is sampled on the
same edge as selected for AI_SD.
When the AI module is programmed as the serial-interface timing mas-
ter, AI_WS acts as an output. It is asserted on the opposite edge of the
AI_SD sampling edge.
Note:
The AI module always acts as receiver, but can be master or slave for A/D timing.
Video In and Audio In are supported by third party software solutions, not by the National solution.
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