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參數(shù)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(shù)字信號處理器，模擬前端 |
| 文件頁數(shù)： | 47/84頁 |
| 文件大?。?/td> | 599K |
| 代理商： | ST75C540FP-A |
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VIII.2.4- QualityStatus
Thequality bytesSTAQUAand STAQUASmonitoran evaluationof thelinequality.Theyare updated once
perbaud andtheir value rangesfrom127 (perfect quality)to 0 (terriblequality). Thisvalue is automaticaly
adjusted according to the current receiving mode. Refer to the following chart to convert the value of
STAQUA into its Bit Error Rate equivalence. The time constant for STAQUA is 100ms. The slow quality
byte(availableon STAOP1in FaxandDatamode exceptFSK)STAQUASgivesthe equivalentqualitywith
a 1 secondetime constant.
BER
1e
-2
VIII - STATUS DESCRIPTION
(continued)
1e
-3
1e
-4
1e
-5
1e
-6
1e
-7
1e
-8
1e
-9
0
31
63
95
127
STAQUA
7
VIII.2.5- Optional Status
According to the operating mode of the ST75C530/540the optionalstatus is displayingdifferent informa-
tions.
The optional status are automaticallyreprogrammed after each CONF command with the address of the
variablesto monitoraccordingwiththeoperatingmodeselected(CONF_OPER).AftertheCONFcommand
the user must overwrite this default programming by using the DOSR command. In order to change the
default set-up please refer to the “RAM Mapping application note” (delivered on request according to
revision number)to obtainthe addressesof the DSPInternalvariables.
VIII.2.5.1- Default OptionalStatusin All modesExcept MODEM
While in Tone mode the format of the STAOPword is as follows:
Optional Status Words
Add.
Name
Bit
7
6
5
4
3
2
1
0
$0C
$0D
$0E
$0F
STAOP0
STAOP1
STAOP2
STAOP3
TDT7
TDT15
TDT6
TDT14
TDT5
TDT13
TDT4
TDT12
RING_PERIOD
(1)
TDT16
TDT3
TDT11
TDT2
TDT10
TDT1
TDT9
TDT0
TDT8
TDT19
TDT18
TDT17
DTMF_DIGIT
(4)
Notes : 1. RING_PERIOD is valid when the Bit 3 ofthe STATUS0(STA_RING goes high. This value is updated at each falling edge of the
RING Signal. The RING_PERIOD value must be multiplied by 2400 to obtain the Period insecond.
2. TDTx (x in [0..15])isthe Output of the 16 Tone detectors x (sampling rate 7200Hz).
3. TDTy (y in [16..19]is the Outputof the secondary Tonedetectors (samplingrate 4800Hz or 9600Hz) with absolute comparison
or relative comparison.
4. DTMF_DIGIT is valid when the Bit 7 of STATUS1(STA_DTMF) goes high. This value remains unchanged until a new DTMF
Digitis detected.
ST75C530- ST75C540
47/84
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