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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)字電話應答機與快閃記憶體介面 |
| 文件頁數(shù)： | 50/117頁 |
| 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
48
If transmit FIFO is empty, mark bits will be generated. During mark bits generation the host may send load data command
or monitoring command. Idle command will terminate mode.
Transmit
Upon getting Start Generation command the DSP will start generating Mark bits according to the value set by the Set
Number of Leading bits command above. Some default value should be set (for example, 300 as required for CID). During
mark bits generation the host may send load data command or monitoring command. Idle command will terminate mode.
Data to Tx FIFO can be loaded before Start Generation command is received or after Start Generation command. If Tx FIFO
is empty “mark” bits will be generated.
After generating “Number of Bytes in Frame” bytes the DSP will start generating trailing mark bits sequence. At this
moment the DSP will set bit READT to “1.” The number of trailing mark bits is defined by the Set Number of Trailing bits
command. At the same time the DSP goes to receive mode and prepares input buffers for data reception.
After mark bits generation is complete, the DSP sets RECEIVE bit in the status word to ‘1.”
Receive after Transmit
The DSP will start accumulating input data immediately after it completes mark bits generation (data accumulated in the
input buffers during mark bits generation will not be processed). The DSP will stay in the FSK Receive mode at least until
next host command is received.
Normally the Host can not send Idle command during trailing mark bits generation because Idle command will terminate
mode immediately. Idle command can be sent only after RECEIVE bit is high .
This means that transition from FSK Transmit to FSK Receive mode will be performed without going via Idle mode.
Receive Command
Command (C7):
0110
1
CODE
0 0 0 0 0 0 0 0
(7 – 0 )
(15 – 12)
(11)
(10 – 8)
CODE
Note:
command received instead C7 command the FSK Receive mode will terminated and the DSP will go to Idle Mode.
= 000:
= 001:
= 010:
= 011:
= 100:
= 101:
= 110:
= 111:
Monitoring Command
Move Received Byte to Host
Monitor Received Mark Bits (before first data byte)
Reset FIFO (Clean Rx FIFO)
HDLC Monitoring
Monitor Received Channel Seizure signals (before first data byte)
Reserved
Stop Receiving Data. The DSP will go to Idle Mode or FSK Transmit according to C1.
C7 Command will be sent during FSK data Receive.
C7 command can be sent during data stream or mark bit detection without interrupting the mode. If an Idle
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