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參數(shù)資料
| 型號(hào)： | ISD-T360SB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support |
| 中文描述： | VoiceDSP數(shù)字語(yǔ)音處理器與主/從，全雙工揚(yáng)聲器，多重閃光和雅藍(lán)/內(nèi)存支持 |
| 文件頁(yè)數(shù)： | 11/109頁(yè) |
| 文件大?。?/td> | 1567K |
| 代理商： | ISD-T360SB |
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1—HARDWARE
ISD-T360SB
1-3
ISD
1.2
DESCRIPTION
This section provides details of the functional
characteristics of the VoiceDSP processor. It is di-
vided into the following sections:
Resetting
Clocking
Power-Down Mode
Power and Grounding
Memory Interface
Codec Interface
1.2.1
The RESET pin is used to reset the VoiceDSP pro-
cessor.
RESETTING
On application of power, RESET must be held low
for at least t
pwr
after V
CC
is stable. This ensures
that all on-chip voltages are completely stable
before operation. Whenever RESET is applied, it
must also remain active for not less than t
RST
, see
Table 1-10 and Table 1-11. During this period,
and for 100 ms after, the TST signal must be high.
This can be done with a pull-up resistor on the TST
pin.
The value of MWRDY is undefined during the re-
set period, and for 100 ms after. The microcon-
troller should either wait before polling the signal
for the first time, or the signal should be pulled
high during this period.
Upon reset, the ENV0 signal is sampled to deter-
mine the operating environment. During reset,
the EMCS/ENV0 pin is used for the ENV0 input sig-
nals. An internal pull-up resistor sets ENV0 to 1.
After reset, the same pin is used for EMCS.
System Load on ENV0
For any load on the ENV0 pin, the voltage should
not drop below V
ENVh
(see Table 1-10 and
Table 1-11).
If the load on the ENV0 pin causes the current to
exceed 10 μA, use an external pull-up resistor to
keep the pin at 1.
Figure 1-2 shows a recommended circuit for
generating a reset signal when the power is
turned on.
Figure 1-2:
Recommended Power-On Reset
Circuit
V
CC
1.2.2
The VoiceDSP processor provides an internal os-
cillator that interacts with an external clock
source through the X1 and X2/CLKIN pins. Either
an external single-phase clock signal, or a crystal
oscillator, may be used as the clock source.
CLOCKING
External Single-Phase Clock Signal
If an external single-phase clock source is used, it
should be connected to the CLKIN signal as
shown in Figure 1-3, and should conform to the
voltage-level requirements for CLKIN stated in
“ELECTRICAL CHARACTERISTICS” on page 1-18.
RESET
ISD-T360
V
CC
V
SS
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