MT9122AE Ver la hoja de datos (PDF) - Mitel Networks
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MT9122AE Datasheet PDF : 32 Pages
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MT9122
Preliminary Information
Function
Controllerless
selected when pins CONFIG1 & 2 ≠ 00
Controller
selected when pins CONFIG1 & 2 = 00
Normal Configuration Set pins CONFIG1 to 1 and CONFIG2 1 to select this Set bits Extended-Delay to 0 and BBM to 0 in Control Reg-
configuration.
ister 1 to select.
Back-to-Back
Configuration
Set pins CONFIG1 to 1 and CONFIG2 to 0 to select
this configuration.
Set bit BBM to 1 in Control Register 1 to select.
Extended Delay
Configuration
Set pins CONFIG1 to 0 and CONFIG2 to 1 to select
this configuration.
Set bit Extended-Delay to 1 in Control Register 1 to select.
Mute
Set pins S2/S1 to 00 and S4/S3 to 00 to select for Echo Set bit MuteR to 1 or MuteS to 1 in Control Register 2 to
Canceller A and Echo Canceller B respectively.
select.
Bypass
Set pins S2/S1 to 01 and S4/S3 to 01 to select for Echo Set bit Bypass to 1 in Control Register 1 to select.
Canceller A and Echo Canceller B, respectively.
Disable Adaptation
Set pins S2/S1 to 10 and S4/S3 to 10 to select for Echo Set bit AdaptDis to 1 in Control Register 1 to select.
Canceller A and Echo Canceller B, respectively.
Enable Adaptation
Set pins S2/S1 to 11 and S4/S3 to 11 to select for Echo Set bits AdaptDis to 0 and Bypass to 0 in Control Register
Canceller A and Echo Canceller B, respectively.
1 to select.
SSI
Tie pin F0i to VSS to select.
Tie pin F0i to VSS to select.
ST-BUS
Apply a valid ST-BUS frame pulse to F0i pin to select. Apply a valid ST-BUS frame pulse to F0i pin to select.
12dB Attenuator
Always disabled.
Set bit PAD to 1 in Control Register 1 to enable.
Double-Talk
Detector
Continuously enabled which disables filter adaptation The detection threshold can be controlled via Double-Talk
when double-talk is detected.
Detection Threshold Register 1 and 2.
Disable Tone
Detector
It is continuously enabled and puts TD1 or TD2 or both
into active low when disable tone is detected. The TD1
and TD2 outputs have to be externally manipulated by
the user to bypass the echo canceller.
Set bit TDis to 1 in Control Register 2 to disable tone
detectors.
Disable Tone
Set pin REV to 1 to select disable tone with phase
reversal (G.165).
Set bit PHDis to 1 in Control Register 2 to select disable
tone without phase reversal (G164).
Non-Linear
Processor
Set pin NLP to 1 to enable.
Set bit NLPDis to 1 to disable.
PCM Law
Set pin LAW to 1 or 0 to select A-Law or µ-Law
respectively.
Set pin LAW to 1or 0 to select A-Law or µ-Law
respectively.
PCM Format
Set pin FORMAT to 0 or 1 to select Sign-Magnitude or Set pin FORMAT to 0 or 1 to select Sign-Magnitude or
ITU-T format respectively.
ITU-T format respectively.
Narrow-Band Signal Continuously enabled which disables the filter adapta- Set bit NBDis to 1 in Control Register 2 to disable.
Detector
tion when narrow band signal is detected.
Offset Null Filter
Continuously enabled which removes the DC compo- Set bit HPFDis to 1 in Control Register 2 to disable.
nent in the PCM input.
Table 7 - MT9122 Function Control Summary
8-28
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