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參數(shù)資料
| 型號： | MT9094 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Digital Telephone (DPhone-II)(數(shù)字電話) |
| 中文描述： | 數(shù)字電話（DPhone -Ⅱ）（數(shù)字電話） |
| 文件頁數(shù)： | 11/34頁 |
| 文件大小： | 234K |
| 代理商： | MT9094 |
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MT9094
7-55
logic low coincident with a falling edge of C4i. C4i
has a frequency (4096MHz) which is twice the data
rate. This clock is used to sample the data at the _
bit-cell position on DSTi and to make data available
on DSTo at the start of the bit-cell. C4i is also used
to clock the DPhone
-II
internal functions (i.e., DSP,
Filter/CODEC, HDLC) and to provide the channel
timing requirements.
The DPhone
-II
uses channels 1, 2 & 3 of the 32
channel frame. These channels are always defined,
beginning with the first channel after frame pulse, as
shown in Figure 6 (DSTi and DSTo channel
assignments). Channels are enabled independently
by the three control bits Ch
1
En -Ch
3
En residing in
the Timing Control Register (address15h).
Ch
1
EN - C-Channel
Channel
information for Mitel’s layer 1 transceiver. The
full 64kb/s bandwidth is available and is
assigned according to which transceiver is
being used. Consult the data sheet for the
selected transceiver for its bit definitions and
order of bit transfer. When this bit is high
register data is transmitted on DSTo. When
low, this timeslot is tri-stated on DSTo. Receive
C-Channel data (DSTi) is always routed to the
register regardless of this control bit's logic
state. C-channel data is transferred on the
ST-BUS MSB first by the DPhone
-II
.
1
conveys
the
control/status
Ch
2
EN and Ch
3
EN - B1-Channel and B2-Channel
Channels 2 and 3 are the B1 and B2 channels,
respectively. These bits (Ch
2
EN and Ch
3
EN)
are used to enable the PCM channels from/to
the DPhone
-II
as required.
Transmit PCM on DSTo
When high, PCM from the Filter/CODEC and DSP is
transmitted on DSTo in the selected ST-BUS
channel. When low, DSTo is forced to logic 0 for the
corresponding timeslot. If both Ch
2
EN and Ch
3
EN
are enabled, default is to channel 2.
Receive PCM from DSTi
When high, PCM from DSTi is routed to the DSP and
Filter/CODEC in the associated channel. If both
Ch
2
EN and Ch
3
EN are enabled the default is to
channel 2.
New Call Tone
The New Call Tone Generator produces a frequency
shifted square-wave used to toggle the speaker
driver outputs. This is intended for use where a
ringing signal is required concurrently with an
already established voice conversation in the
handset.
Programming of the DSP for New Call generator is
exactly as is done for the tone ringer micro-program
except that the OPT bit (DSP Control Register,
address 1Eh) is set high. In this mode the DSP does
not produce a frequency shifted squarewave output
to the filter CODEC section. Instead the DSP uses
the contents of the tone coefficient registers, along
with the tone warble rate register, to produce a gated
squarewave control signal output which toggles
between the programmed frequencies. This control
signal is routed to the New Call Tone block when the
NCT EN control bit is set (General Control Register,
address 0Fh). NCT EN also enables a separate gain
control block, for controlling the loudness of the
generated ringing signal. With the gain control block
set to 0dB the output is at maximum or 6 volts p-p.
Attenuation of the applied signal, in three steps of 8
dB, provide the four settings for New Call tone (0, -8,
-16, -24 dB). The NCT gain bits (NCTG
0
-NCTG
1
)
reside in the FCODEC Gain Control Register 2
(address 0Bh).
Figure 6 - ST-BUS Channel Assignment
F0i
DSTi,
DSTo
125
μ
s
CHANNEL 1
C-channel
CHANNEL 3
B2-channel
CHANNEL 2
B1-channel
CHANNELS 4 - 31
Not Used
MSB first for C, B1 - & B2-
Channels
Not
Used
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