參數(shù)資料
型號: 82C931
廠商: Electronic Theatre Controls, Inc.
英文描述: Plug and Play Integrated Audio Controller
中文描述: 即插即用集成音頻控制器
文件頁數(shù): 34/64頁
文件大小: 634K
代理商: 82C931
82C931
Page 26
912-3000-035
Revision: 2.1
OPTi
4.8.6.3
This signal is the serial digital audio PCM clock.
SCLK
4.8.6.4
This signal is the Master clock for the digital audio. MCLK is
asynchronous to LRCLK, SDATA and SCLK.
MCLK
The MCLK must be either 256x or 384x the desired Input
Word Rate (IWR). IWR is the frequency at which words for
each channel are input to the DAC and is equal to the LRCLK
frequency. The following table illustrates several standard
audio word rates and the required MCLK and LRCLK fre-
quencies. Typically, most devices operate with 384fx master
clock.
The ZV Port audio DAC should support an MCLK frequency
of 384fs. This results in the frequencies shown below.
4.8.7
Advanced Precision General Purpose
Serial Port
The 15-pin "D-sub" connector on the rear panel provides all
input and output signals for a general purpose serial
input.output port, plus DSP-program specific input and output
pins which may be used in certain DSP (.AZ2) programs. The
pinout of the connector is detailed below. All inputs are TTL
level compatible CMOS. All outputs are CMOS isolated by
50
series resistors and rise time limiting networks.
Figure 4-4
General Purpose Serial Port, Timing Relationships
1.
2.
3.
4.
FRAME SYNC INPUT SETUP TIME (from falling edge, las bit clock previous subframe) 30nS minimum
FRAME SYNC INPUT SETUP TIME (to falling edge, first bit clock of present subframe) 30nS minimum
DATA INPUT SETUP TIME (to bit clock falling edge) 30nS minimum
DATA INPUT HOLD TIME (from bit clock falling edge) 45nS minimum
LRCLK (KHz)
Sample Frequency
SCLK (MHz)
32xfs
MCLK (MHz)
384x
22
0.704
8.448
32
1.0240
12.2880
44.1
1.4112
16.9344
48
1.5360
18.4320
Pin
1
Function
Ground
Pin
9
Function
Serial Input Master
Clock (input)
Serial Input Bit Clock
(input)
Auxiliary Output (DSP
program specific)
Serial Output Bit
Clock (output)
Serial Input Data
(input)
Serial Output Frame
Sync (output)
Serial Input Frame
Sync (input)
2
+5V (tied to unused
inputs high)
Auxiliary Input (DSP
program specific)
Ground
10
3
11
4
12
5
Ground
13
6
Serial Output Data
(output)
Ground
14
7
15
8
Ground
Bit Clock In
Data In
Frame Sync In
MSB
LSB
MSB
MSB
LSB
MSB
LSB
MSB
CHAN
A
Channel A
Channel B
Detail
CLK
63
CLK
0
CLK
1
CLK
2
CH A
MSB
3
4
1
2
Bit Clock In
Data In
Frame Sync In
CLK
31
CLK
32
CLK
33
CLK
34
CH B
MSB
1
2
3
4
CHAN
A
Detail
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