參數(shù)資料
型號： 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)答機與快閃記憶體介面
文件頁數(shù)： 100/117頁
文件大?。?/td> 551K
代理商： D6571E
D6571E Data Sheet
DS6571E.2
DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490
96
Command (C3):
0 0 1 0
0 0 0 0
NUMBER OF BYTES (for compressed data)
NUMBER OF WORDS (for
μ
/A-law PCM data)
(15 - 12) (11 - 8) (7 - 0)
NUMBER OF BYTES - Indicates the number of bytes that the Host plans to write to the D6571E. This number should
generally be set to the maximum number of bytes per frame for compressed data (48).
NUMBER OF WORDS - Indicates the number of bytes that the Host plans to write to the D6571E. This number should
generally be set to the maximum number of words per frame for
μ
-law/A-law PCM data (120).
Status (S3):
0 0 1 0
0
IND
0 0
TRANSFER NUMBER OF BYTES (compressed data)
TRANSFER NUMBER OF WORDS (
μ
/A-law PCM data)
(15 - 12) (11) (10) (9 - 8)
TRANSFER NUMBER OF BYTES - Indicates the number of bytes of compressed that the D6571E will accept from the Host.
This number is generally a value between 2 and 48.
TRANSFER NUMBER OF WORDS- Indicates the number of words of
μ
-law/A-law data that the D6571E will accept from
the Host. This number is 120.
IND (Insufficient Data) - Indicates that the Host is going to transmit to the D6571E less data bytes than necessary for
decompression. If the Host is going to transmit less data than necessary for decompression, the D6571E will not accept
this data. In this case, the D6571E will respond with TRANSFER NUMBER OF BYTES set to 00000000 and will skip the
byte transfer phase. The D6571E will play silence if there is an inadequate amount of data for decompression. The PAUSE
function can be implemented by using this feature.
If the IND bit is not set to ‘1’, then the Host can transfer data to the D6571E. After the Host receives status S3, the actual
data transfer begins. The descriptions of the TrueSpeech and
μ
-law/A-law PCM data pumps are given below.
TrueSpeech Data Pump:
The Host sends the high byte of the command word (which contains data) to the D6571E. The D6571E echoes the
received data in the high byte of the status word (Data Transfer status). During the data transfer phase, the HI\LO pin
(pin 4) should be set to high.
Data Transfer Command:
(DC1 . . . DC_Transfer_Number_of_Bytes for TrueSpeech Data Pump)
(7 - 0)
DATA BYTE
(15 - 8)
Data Transfer Status:
(DS1 . . . DS_Transfer_Number_of_Bytes for TrueSpeech Data Pump)
ECHO OF DATA BYTE
(15 - 8)
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