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參數(shù)資料
| 型號(hào)： | NSAM265SRA |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | CompactSPEECH Digital Speech Processors |
| 中文描述： | CompactSPEECH數(shù)字語音處理器 |
| 文件頁數(shù)： | 6/58頁 |
| 文件大?。?/td> | 712K |
| 代理商： | NSAM265SRA |
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1.0 Theory of Operation
(Continued)
TABLE 1-1. CompactSPEECH States and Transitions
(Continued)
Command
Description
Source State
Result State
Message Management Commands
CMT
Cut Message Tail
IDLE
IDLE
DM
Delete Message
IDLE
IDLE
DMS
Delete Messages
IDLE
IDLE
GL
Get Length
IDLE
IDLE
GMT
Get Message Tag
IDLE
IDLE
GNM
Get Number of Messages
IDLE
IDLE
GTM
Get Tagged Message
IDLE
IDLE
RRAM
Read RAM
IDLE, MEMORYDREAD
MEMORYDREAD
SMT
Set Message Tag
IDLE
IDLE
WRAM
Write RAM
IDLE, MEMORYDWRITE
MEMORYDWRITE
*
Command is valid in IDLE state, but has no effect.
1.3 COMMAND EXECUTION
A CompactSPEECH command is represented by an 8-bit
opcode. Some commands have parameters, and some
have a return value. Commands are either synchronous or
asynchronous.
Synchronous Commands
A synchronous command completes execution before the
microcontroller can send a new command (e.g., GMS,
GEW).
A command sequence starts when the microcontroller
sends an 8-bit opcode to the CompactSPEECH, followed by
the command’s parameters (if any).
The CompactSPEECH executes the command and, if re-
quired, transmits a return value to the microcontroller. Upon
completion, the CompactSPEECH notifies the microcontrol-
ler that it is ready to accept a new command.
Asynchronous Commands
An asynchronous command starts execution in the back-
ground and notifies the microcontroller which can send
more commands while the current command is still running
(e.g., R, P).
The Status Word
The CompactSPEECH processor has a 16-bit status word
to indicate events that occur during normal operation. The
CompactSPEECH activates the MWRQST signal, to indi-
cate a change in the status word. This signal remains active
until the CompactSPEECH receives a GSW command.
The Error Word
The 16-bit error word indicates errors that occurred during
execution of the last command. If an error is detected, the
command is not processed; the EVDERROR bit in the
status word is set to 1, and the MWRQST signal is activat-
ed.
Error Handling
When the microcontroller detects that the MWRQST signal
is active, it should issue the GSW (Get Status Word) com-
mand which deactivates the MWRQST signal. Then it
should test the EVDERROR bit In the status word, and,
if it is set, send the GEW (Get Error Word) command to read
the error word for details of the error.
For a detailed description of each of the CompactSPEECH
commands, see Section 3.0
1.4 TUNABLE PARAMETERS
The CompactSPEECH processor can be adjusted to your
system’s requirements. For this purpose the Compact-
SPEECH supports a set of tunable parameters, which are
set to their default values after reset and can be later modi-
fied with the TUNE command. By tuning these parameters,
you can control various aspects of the CompactSPEECH’s
operation, such as silence compression, tone detection, no-
energy detection, etc.
Table 3-1 describes all the tunable parameters in detail.
Section 3 describes the TUNE command.
1.5 MESSAGES
The CompactSPEECH message manager supports a wide
range of applications, which require different levels of DAM
functionality.
The message-organization scheme and the message tag,
support advanced memory-organization features such as
multiple OutGoing Messages (OGMs), mailboxes and the
ability to distinguish between InComing Messages (ICMs)
and OGMs.
The NSAM265SF can store up to 256 messages per 4 Mbits
of AFLASH storage. The NSAM265SR can store up to 100
messages per 4 Mbits of ARAM storage.
A message is the basic unit on which most of the Compact-
SPEECH commands operate. A CompactSPEECH mes-
sage, stored in ARAM or AFLASH, can be regarded as a
computer file stored on a mass-storage device.
A message is created with either the R or the WRAM (Write
RAM) command. When a message is created, it is assigned
a time-and-day stamp and a message tag which can be
read by the microcontroller.
The R command takes voice samples from the codec, com-
presses them, and stores them in the message memory.
6
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PDF描述 |
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| NSAM266SVLJ | 4 Mbit Uniform Sector, Serial Flash Memory |
| NSAM266SA | 4 Mbit Uniform Sector, Serial Flash Memory |
| NSAM266SAA | 4 Mbit Uniform Sector, Serial Flash Memory |
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| NSAM266SAA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:NSAM266SA CompactSPEECHTM Digital Speech Processor with Serial Flash Interface |
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