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參數(shù)資料
| 型號(hào)： | D6571E |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Chip for an All-Digital Telephone Answering Machine with Flash Memory Interface |
| 中文描述： | 芯片的全數(shù)字電話應(yīng)答機(jī)與快閃記憶體介面 |
| 文件頁(yè)數(shù)： | 12/117頁(yè) |
| 文件大?。?/td> | 551K |
| 代理商： | D6571E |
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D6571E Data Sheet
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
12
OPERATIONAL DESCRIPTION
INITIAL PROCEDURE
No operation should be performed with the new flash
before it is initialized once. Any flash access before
initialization may destroy information about bad blocks
and make flash unusable.
After power up, the
PDN
signal (pin 22) should be set
high followed by the RESET pulse (Refer to Figure 4 for
the timing). Upon detecting falling edge of the RESET
pulse, the D6571E checks some predefined locations in
the Flash Memory to determine if Flash was initialized
and responds to one of the following situations:
1. Flash memory was previously initialized -
“warm start”. The D6571E restores the
previous conditions and system parameters. The
message directory and all messages remain saved.
The D6571E returns garbage collection status
with the “cold start” bit reset (0).
2. Flash memory was not previously initialized -
“cold start”. The D6571E returns garbage
collection status with the “cold start” bit set (1).
After sending Garbage Collection status the D6571E
will enter Idle mode. After sending RESET the Host
should wait for ACK pin to become low and then read
status. No command should be sent to the D6571E until
host reads the Garbage Collection Status.
If this is a “cold start” only commands that do not
require flash access are available: Idle, Line Monitor,
Read Memory Status, SpeakerPhone, Tone Generation
(16 standard DTMF tones only), Data Pump, and Self
Test and Initialization. If any other command is issued,
the D6571E will stay in Idle mode and return Idle status.
The D6571E behaves in the same manner if the flash is
not initialized (
“cold start”
condition) or there is no
flash in the system (
“no flash”
condition).
To initialize flash memory Flash Hardware Selection
(Test Mode = 0101) be issued first because no other Self
Test and Initialization command will be accepted until
this command is issued! After Flash Hardware Selection
only Test Mode = 0011 (Fast Self Test) and Test Mode
= 0001 (Flash Initialization) are available.
The Flash Hardware Selection and the Fast Self Test
command can be issued to confirm the configuration of
the flash if necessary. Fast Test will destroy the
contents of the memory except for the voice prompt
sectors, tone table, and bad block table.
Normally the Flash Hardware Selection and then the
Flash Initialization command may be sent to perform the
Initialization. All memory will be initialized except for the
voice prompt sectors and bad block table.
MODES OF OPERATION
The D6571E is normally in Idle mode. Each time a
command other than Idle is issued, the system will enter
the new mode. From some of the modes, the system will
automatically return to Idle mode after completion of the
operation. Other modes (Record, Playback, Tone
Generation, Line Monitoring, Voice Prompt Generation
and SpeakerPhone) require an Idle command to return to
Idle mode.
There are 16 modes of operation. Each of these modes
is entered from the monitor program through Idle mode.
The 16 modes are as follows:
0.
Idle
- The D6571E performs command polling. It
checks the command register in the HOST-D6571E
interface and transfers to the requested operating
mode.
1.
Record
- The D6571E performs speech compression
and records a message into the Flash memory.*
2.
Playback
- The D6571E performs message playback
using compressed speech data stored in the Flash
memory.*
3.
Read Memory Status
- The D6571E returns
information on the Memory status to the HOST,
e.g., the number of messages stored in the Flash
memory, memory full condition, program ROM
checksum status, voice prompt checksum status
and if Garbage collection is recommended.
4.
Write Data to Storage
- In this mode the D6571E
receives data from the HOST and stores it either in
the Telephone Number Storage, or Non-Erasable
Storage, or General Purpose Storage in the flash
under index number given by the HOST.
5.
Read Data from Storage
- The D6571E returns to
the HOST data stored in Telephone Number
Storage, or Non-Erasable Storage, or General
Purpose Storage under the index number given by
the HOST.
6.
Tone Generation
- The D6571E generates a single
or double tone with programmable parameters. *
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