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參數資料
| 型號： | ST75C540FP-A |
| 廠商： | 意法半導體 |
| 英文描述： | SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES |
| 中文描述： | 超級綜合DEVICESWITH數字信號處理器，模擬前端 |
| 文件頁數： | 13/84頁 |
| 文件大?。?/td> | 599K |
| 代理商： | ST75C540FP-A |
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V - FUNCTIONALDESCRIPTION
V.1 - SystemArchitecture
Thechipallowsthe designofacompleteFAX,Data
Modem, Hands-Free Telephone and Answering
Machine system. A versatiledual port RAM allows
an easy interfacewith most micro-controllers.
V.2 - Modesof Operation
Referto AppendixAfor BlockDiagrams.
V.3 - Operations
V.3.1 - ModemTransmitterDescription
The signal pulses are shapedin a dedicatedfilter
further combined with a compromise transmit
equalizersuited for transmissionover stronglydis-
tortedlines. 3 differentcompromiseequalizersare
available and can be selectedby software.
V.3.2 - ModemReceiver Description
The receiver section handlescomplexsignals and
uses a fractionallyspacedcomplex equalizer. It is
able to cope with distantmodemtiming driftsup to
10
-4
asspecifiedin the ITU-Trecommendations.It
also compensates for frequency drift up to 10Hz
and for phase jitter at multiple and simultaneous
frequencies.
V.3.3 - Tone GeneratorDescription
Fourtonescanbe simultaneouslygeneratedbythe
ST75C530/540. These tones are determined by
theirfrequenciesandbytheoutputamplitudelevel.
A set of specific commands are also available for
DTMFgeneration.Anyof the4 tonegeneratorscan
be output independentlyeither on the Audio DAC
or the line DAC.
V.3.4 - Tone DetectorDescription
During TONE (respectively TONECID) Mode six-
teen (respectively eight) tones can be simultane-
ously detected by the ST75C530/540.Each of the
tonesto be detectedis defined by the coefficients
of a4th orderprogrammableIIR.Detectionthresh-
oldsareprogrammablefrom -51dBmupto -6dBm.
These primary detectors can detect tone up to
3.3kHz (sampling rate 7.2kHz in all modes). They
also have a programmable internal wiring feature
(seeChapter IX).
In allmodes,exceptHandset(HANDSET)andFull
Duplex V.32bis/V.32/V.22bis/V.22 (Modem)
modes, 4 additional tone detectors (each of them
being a 4th order programmable IIR) are concur-
rently running. In Handset mode only 2 additional
tone detectors are available. Detectionthresholds
areprogrammablefrom-51dBmup to -6dBm.This
secondary programmable detector can detect
tones up to 1.8kHz by default set-up with a sam-
pling rate at 4.8kHz. But this 4 additional tone
detectorscan also detect tones up to 3.3kHz with
a samplingrate at 9.6kHz.In order to avoid wrong
detectgion,relative detectgionis also provided.
V.3.5- V.21Channel2 FlagDetector Description
InalltheReceiveFAXModes,includingV.21Chan-
nel 2 Mode, the ST75C530/540processes a V.21
Flag“7E” detector,either in the idle state,the train
sequenceor the data mode. The detection time is
3 consecutive flags to detect and 1 byte to loose
the detection.
V.3.6- HDLCDescription
In all FAXModes (MODEM), including V.21 Chan-
nel
2
Mode,
and
V.32bis/V.32/V.22bis/V.22 (Modem) modes, a
HDLC framing and deframing is supported by the
ST75C530/540. The number of transmitted flags
can be programmed.
also
Full
Duplex
V.3.7- UARTDescription
In Full Duplex V.32bis/V.32/V.22bis/V.22 Modem
ModesandTONECIDV.23receivemode,aparallel
UART is performed by the ST75C530/540. This
UARTmanage the Breaksignaleitherat thetrans-
mit and the receive bit stream. The Data format
supportedare7 and 8 bit of Data; even, odd or no
Parity,1 or 2 stop bits.
V.3.8- DTMFDetector Description
ADTMFDetectorisincludedintheST75C530/540,
it allows detection of valid DTMF Digits. A valid
DTMF Digit is defined as a dual tone with a total
power higher than -43dBm,a durationhigher than
40msanda differentialamplitudewithin
±
8dB.This
DTMF Detector is enabled in all modes except in
Fax Modem, Data Modem and Handset modes. It
is also enabled in V.21 Channel 2 Receive Mode.
The DTMF thresholds and duration can be
changed from they default value by overwriting
DSP’s RAM locations. In the default setup, this
detectoris compliantwith the NET4standard.The
frequencydeviationcan bechangedbyoverwriting
the default DTMF’s filters coefficients.
V.3.9- Ring Detector
This detector detects RING signal from 15Hz to
68Hz, it can be programmed to expand the mini-
mum and maximum detection frequency up to
12Hz (formin)and144Hz (formax). The detection
time is equal to one period of the ring signal, and
theloosetime to the minimum betweenoneperiod
of the ring signal and the inverse of the minimum
frequency.
The associated STA_RINGstatus is as Figure 1.
ST75C530- ST75C540
13/84
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