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參數(shù)資料
| 型號： | ISD-SR3000 |
| 文件頁數(shù)： | 12/120頁 |
| 文件大小： | 1293K |
| 代理商： | ISD-SR3000 |
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1-7
1—HARDWARE
ISD-SR3000
ISD
Figure 1-6:
1
5V Power Connection Diagram
For optimal noise immunity, the power and ground pins should be connected to V
CC
and the
ground planes, respectively, on the printed circuit board. If V
CC
and the ground planes are not
used, single conductors should be run directly from each V
CC
pin to a power point, and from
each GND pin to a ground point. Avoid daisy-chained connections. The ISD-SR3000 does not
perform recognition in power-down mode.
When you build a prototype, using wire-wrap or other methods, solder the capacitors directly to
the power pins of the ISD-SR3000 processor socket, or as close as possible, with very short
leads.
1.2.5
The ISD-SR3000 supports flash or ROM devices for storing voicetags, vocabulary, prompts,
and acoustic models, such that power can be removed from the system without any data loss.
The ISD-SR3000 supports AMD-compatible parallel flash devices, depending upon the re-
quired amount of memory. The recommended flash size is 16Mb, but larger sizes may be re-
quired for some applications. Organization can be 1Mb X 16 or 2Mb X 8. The recommended
device is Am29LV160D, which is organized as 1Mb X 16, and operates on a 3V power supply.
MEMORY INTERFACE
1.2.6
The ISD-SR3000 provides an on-chip interface for analog and digital telephony, supporting
master and slave CODEC interface modes. In master mode, the ISD-SR3000 controls the op-
eration of the CODEC for use in analog telephony or stand-alone applications. In the slave
mode, the ISD-SR3000 CODEC interface is controlled by an external source. This mode is
THE CODEC INTERFACE
97
95
87
86
85
76
66
64
17
19
20
40
42
V
SSA
C
1
V
SS
V
CC
V
CCHI
V
SS
V
CC
V
CC
V
SS
5 V Supply
ISD-SR3000
C
5
V
SS
V
CC
V
CCA
V
CC
V
SS
C
4
C
3
C
7
R
1
C
6
C
14
C
9
C
10
C
8
C
11
C
12
C
13
+
+
+
+
+
+
+
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