参数资料
型号: ADAU1445YSVZ-3A-RL
厂商: Analog Devices Inc
文件页数: 26/92页
文件大小: 0K
描述: IC SIGMADSP 175MHZ 100TQFP
标准包装: 1,000
系列: SigmaDSP®
类型: 音频处理器
应用: 车载音频
安装类型: 表面贴装
封装/外壳: 100-TQFP 裸露焊盘
供应商设备封装: 100-TQFP-EP(14x14)
包装: 带卷 (TR)
ADAU1445/ADAU1446
Rev. A | Page 32 of 92
Serial Clock Domains
There are 12 clock domains (pairs of LRCLKx and BCLKx pins)
available in the ADAU1445/ADAU1446. Of these, three are avail-
able exclusively to the serial data input ports, three are available
exclusively to the serial data output ports, and the remaining six
can be assigned to clock either input or output ports.
The ADAU1445 contains two 8-channel ASRCs, whereas the
ADAU1446 contains no ASRCs. However, all clock domain pins
are available on every IC in the ADAU1445/ADAU1446. In a
system with no sample rate conversion and with serial ports in
slave mode, at least two pairs of LRCLKx and BCLKx pins must
be connected: one pair for the input serial ports and one pair
for the output serial ports. If all serial ports are in master mode
and synchronous, then only one pair of LRCLKx and BCLKx pins
needs to be connected.
Figure 27 shows a simplified view of the assignment of clock
domains to the input and output sides of the chip. Note that
each clock domain comprises two signals, namely the BCLK
(bit clock) and LRCLK (frame clock). Therefore, the 12 clock
domains contain a total of 24 clock signals.
Each clock domain is capable of acting as a master or slave. For
this reason, all LRCLK and BCLK pins are bidirectional. In slave
mode, the LRCLK and BCLK pins receive clock signals from an
external source, such as a codec. In master mode, the LRCLK
and BCLK pins output clock signals to external slave ICs.
Although a clock domain in slave mode can clock an arbitrary
number of serial ports, a clock domain in master mode can only
clock a single serial port. For Clock Domains[2:0] and Clock
Domains[11:9], the corresponding serial port is fixed as an input
or output. For assignable clock domains (Clock Domains[8:3]),
the corresponding serial port can be either an input or output,
depending on the setting of the clock pad multiplexer register
(see Table 18 for more details).
Table 18. Master Mode Clock Domain Assignment
Clock
Domain
Chip Pins
Serial Port
0
LRCLK0, BCLK0
SDATA_IN0
1
LRCLK1, BCLK1
SDATA_IN1
2
LRCLK2, BCLK2
SDATA_IN2
3
LRCLK3, BCLK3
SDATA_IN3 or SDATA_OUT31
4
LRCLK4, BCLK4
SDATA_IN4 or SDATA_OUT41
5
LRCLK5, BCLK5
SDATA_IN5 or SDATA_OUT51
6
LRCLK6, BCLK6
SDATA_IN6 or SDATA_OUT61
7
LRCLK7, BCLK7
SDATA_IN7 or SDATA_OUT71
8
LRCLK8, BCLK8
SDATA_IN8 or SDATA_OUT81
9
LRCLK9, BCLK9
SDATA_OUT0
10
LRCLK10, BCLK10
SDATA_OUT1
11
LRCLK11, BCLK11
SDATA_OUT2
1 Depends on the setting of the clock pad multiplexer register (Address 0xE240).
SERIAL
INPUT
PORTS
(×9)
SERIAL
OUTPUT
PORTS
(×9)
CLOCK DOMAINS
(×12)
0 TO 2
3 TO 8
9 TO 11
MASTER/SLAVE
SELECT
SDATA_IN0
SDATA_IN1
SDATA_IN2
SDATA_IN3
SDATA_IN4
SDATA_IN5
SDATA_IN6
SDATA_IN7
SDATA_IN8
SDATA_OUT0
SDATA_OUT1
SDATA_OUT2
SDATA_OUT3
SDATA_OUT4
SDATA_OUT5
SDATA_OUT6
SDATA_OUT7
SDATA_OUT8
BCL
K0/
L
R
C
L
K
0
BC
L
K
1/
L
R
CL
K1
BC
L
K
2/
L
R
CL
K2
BC
L
K
3/
L
R
CL
K3
BC
L
K
4/
L
R
CL
K4
BC
L
K
5/
L
R
CL
K5
BC
L
K
6/
L
R
CL
K6
BC
L
K
7/
L
R
CL
K7
BC
L
K
8/
L
R
CL
K8
BC
L
K
9/
L
R
CL
K9
BCL
K10
/L
RCL
K10
BCL
K11
/L
RCL
K11
2
6
12
6
2
07
69
6-
0
26
Figure 27. Simplified Serial Clock Domain Assignment
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