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ST75C520 데이터시트(PDF) 24 Page - STMicroelectronics

부품명 ST75C520
상세설명  HIGH SPEED FAX MODEM DATA PUMP
PDF  45 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST75C520 데이터시트(HTML) 24 Page - STMicroelectronics

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SYNC
FAX Synchronize the Receiver
SYNC
Opcode:
26
00100110
Synopsis
SYNC is used, in FAX Modes, to force the ST75C520 to Start/Stop the receiver in
accordance with the corresponding ITU-T V.33/V.17/V.29/V.27recommendation.As soon
as the ST75C520 receives the SYNC Start command it sets its receiver to detect the FAX
synchronization signal.This command is the equivalent HSHK command for the receiver.
Parameters
Field
Byte
Pos.
Value
Definition
RX_SYNC
1
0
0*
1
Stop receiver
Start receiver synchronization
TDRC
Tone Detector Read Coefficient
TDRC
Opcode:
1A
00011010
Synopsis
TDRC Read one Coefficient of the selected Tone Detector Cell.
Parameters
Field
Byte
Pos.
Value
Definition
TD_CELL
1
3..0
0..F
Tone detector cell number
TD_C_ADDR
2
7..0
0..B
10
20
Other
Biquad coefficient
Energy coefficient
Static level
Reserved
The command answer is : Low Byte of Coefficient followed by High Byte of Coefficient.
TDRW
Tone Detector Read Wiring
TDRW
Opcode:
1B
00011011
Synopsis
TDRC Read Wiring of the selected Tone Detector Cell.
Parameters
Field
Byte
Pos.
Value
Definition
TD_CELL
1
3..0
0..F
Tone detector cell number
TD_W_ADDR
2
0
0
1
Other
Biquad and energy input
Comparator inputs
Reserved
The command answer is:
a) If TD_W_ADDR = 0 :
- First Byte is the Node Number of the Signal connected to Biquadratic Filter input.
- Second Byte is the Node Number of the Signal connected to the Energy estimator input.
b) if TD_W_ADDR = 1 :
- First Byte is the Node Number of the Signal connected to Comparator Negative input.
- Second Byte is the Node Number of the Signal connectedto the Comparator Positive input.
ST75C520
24/45



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