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參數(shù)資料
| 型號(hào)： | MT9079 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Advanced Controller for E1(先進(jìn)的E1幀調(diào)節(jié)器和控制器) |
| 中文描述： | 高級(jí)控制器素E1（先進(jìn)的素E1幀調(diào)節(jié)器和控制器） |
| 文件頁數(shù)： | 40/60頁 |
| 文件大?。?/td> | 347K |
| 代理商： | MT9079 |
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MT9079
4-246
The MC1455 RESET and HALT circuit has be taken
from the MC68302 User's Manual. The reset circuit
for the MT9079 (RC) must have a time constant that
is at least five times the rise time of the power
supply. It should also be noted that in this application
the power-on reset (POR) duration for the MT9079
devices must be greater than the duration of the
power-on reset pulse for the MC68302. This will
allow AIS to be transmitted without interruption
during the system initialization.
During the power-on sequence the MT9079 POR
circuit will ensure that AIS is transmitted on the PCM
30 trunks by putting the 74HCT74 flip-flops in the
preset state. When the MT9079 POR signal goes
from low to high, the 74HCT74 flip-flops will remain
in the preset state and AIS will continue. After the
system initialization program has been completed
the AIS signal can be terminated by executing a
MC68302 reset command, which makes the
MC68302 RESET pin low for 24 CLKO cycles. When
RESET goes low the 74HCT74 flip-flops will be
cleared and the TAIS inputs can go high.
The MC68302 watch-dog timer must be reset
periodically or the WDOG output will go low for 16
microprocessor clock cycles (CLKO) and return high.
In the circuit of Figure 11 this will reset the MC68302
and turn on the transmit AIS of all the MT9079
devices through the 74HCT74 flip-flops. The transmit
AIS will not terminate until the MC68302 reset
command has been executed to clear the 74HCT74
flip-flops.
Provision has been provided to initiate the
transmission of AIS on individual MT9079 devices
from a control port. This function can also be
accomplished by writing to the Transmit Alarm
Control Word of the MT9079.
Interface Initialization
Figure 12 is a flow chart that illustrates the basic
steps involved in initializing the MT9079 from a
power-on state. The post reset state of each control
bit will determine which flow chart steps may be left
out in specific applications.
The first step is to make TAIS low so the MT9079 will
transmit an all 1’s signal during the initialization
procedure. This informs the remote end of the E1
link that this end is not functioning normally. After the
RESET cycle is complete all interrupts are
suspended so the microprocessor will not jump to
any interrupt service routines until the interface is
configured. It is important to write 00H to all the
per-timeslot control words (pages 7 and 8) so that
transmit timeslots are not substituted with unknown
data. Next the mode of operation and timing can be
selected.
Figure 11 - MT9079 Reset and Transmit AIS Circuit
1M
10k
TH
RS
TR
CV
DIS
O
MC1455
+5V
1M
+5V
+5V
0.47
μ
F
0.1
μ
F
IN4148
12k
+5V
74HCT05
4.7k
+5V
74HCT05
HALT
RESET
WDOG
MC68302
74HCT05
74HCT05
74HCT05
+5V
+5V
+5V
74HCT74
4.7k
74HCT05
4.7k
4.7k
TAIS
RESET
MT9079
MT9079
to Control Port
74HCT11
PCM 30
Trunk 0
DPRQ
Q
CLR
DPRQ
Q
CLR
TAIS
RESET
to Control Port
74HCT11
PCM 30
Trunk 1
.
.
.
.
TAIS
RESET
MT9079
to Control Port
74HCT11
PCM 30
Trunk n
.
.
.
.
R
C
+5V
74HCT14
MT9079
POR
IN4148
V
R
74HCT32
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT9079AC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS? FAMILY Advanced Controller for E1 |
| MT9079AE | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS? FAMILY Advanced Controller for E1 |
| MT9079AL | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS⑩ FAMILY Advanced Controller for E1 |
| MT9079AP | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS ST-BUS⑩ FAMILY Advanced Controller for E1 |
| MT9079APR | 制造商:Microsemi Corporation 功能描述:FRAMER E1 5V 44PLCC - Tape and Reel |
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