參數(shù)資料
型號(hào)： STLC5411FN
廠商： 意法半導(dǎo)體
英文描述： 2B1Q U INTERFACE DEVICE
中文描述： 2B1Q U接口裝置
文件頁數(shù)： 36/72頁
文件大?。?/td> 739K
代理商： STLC5411FN
ways to enter quiet mode: QM bit in CR6 register
and QM primitive command to write in TXACT
register; in this last case, any further primitive will
clear quiet mode.
AUTOMODE
For all auto mode configurations,AIS pin allows a
choice of line interface: 27 or 15mH for the trans-
formerand resistorsline or deviceside.
In NT1, the activation/deactivation state machine
and the automatic power-up / power-down capa-
bilities of the UID provide for a direct connection
through GCI between UID and SID-GCI (ST
5421) without the need of an extra microcontroller
(see figure13b).LSD- pinof SID-GCI must be con-
nectedtogetherto the Bx inputpin of UID toensure
autonomouspower-up/downcontrol.Activation/De-
activation commands and indications are trans-
ferred from one device to the other by meansof the
C/I channel. Maintenance functions are automat-
ically processed in UID. Therefore, there is not
transfer of messages on the Monitor channel be-
tween UID and SID-GCI. Please note that the
2B+D loop-back request at the S interface is pro-
vided using the C/I channel code ARL and that
there is not automatic processing of S and Q mes-
sagesin SID-GCI.
In Repetor,the same advantagesprovide for a di-
rect connection through GCI between both UID
without the need of an extra microcontroller (see
figure 13c). As for NT1, C/I channel transfersacti-
vation/deactivation commands and indications.
Maintenance functions are automatically proc-
essed in UIDs, needing the transfer of eoc mes-
sages, overhead bits and CRC fault detections.
This is performed autonomously on the Monitor
channel by sendingwhen required messages in a
regular format as already described.EOC mes-
sages are transmitted according to Table 5; over-
head bits in the M4 channel excluding (act, dea,
uoa and sai) transferred transparently; spare
overhead bits in M5 or M6 bit positions are also
transferred transparently; febe and nebe bits are
transmittedaccording to Figure10.
COMMAND INDICATION (C/I)CODES
Activation, deactivation and some special test
functions can be initiated by the system by writ-
ing in TXACT register. Any status change of the
on-chip state machine is indicated to the system
by the UID by setting a new code in the RXACT
register. When GCI is selected, TXACT and
RXACT registersare normally associated with the
C/I channel (it is possible to associate them with
the MONITOR channel thank to the CID bit in
CR2 register). All commands and indications are
coded on four bits: C1, C2, C3, C4. Codes are
listed in Table 7. For each mode, a list of recog-
nized commands and generated indications is
given. Hereafter, you have a detailed description
of the codes depending on mode selected.
NT mode:Command
0000 (PUP):
PowerUp
When in the power down state, PUP command
powers up the device ready for a cold or a warm
start. When GCI is selected with clocks as out-
puts, PUP command is replacedby pullinglow Bx
input pin.
0001 (RES):
Reset
RES command resets UID ready for a cold start.
Configurationregisters are not changed.REScan
be operatedwhen the device is either powered up
or down.
If RES command is applied when the line is not
fully deactivated,UID properly ends the activation
before to come back in H1 state; In this case DP
or EIU indication is returned(Auto mode configu-
ration or not respectively).
0010 (SP1):
Send SinglePulse +1 and -1
SP1 test command forces UID to send +1, -1,
pulses to the line,one pulse per frame.
0011 (RDT):
RandomData Transmitted
RDT test command forces UID to send data with
random equiprobablelevels at 80 kbaud.
0100 (EIS):
Error Indicate S Interface
EIS command reports on the U line, a default on
the Sinterface.
0101 (PDN):
PowerDown
PDN commandforces UID to power down state. It
should normally be used after UID has been set
in a known deactivatedstate, e.g. in an NT aftera
DI statusindication has been reported.In GCI,C/I
indication (DI) is sent twice on Br output before
UID powersdown.
0110 (UAI):
U interfaceActivationIndicate
UAI command is significant only when RR bit is
set equal one in CR2 register or if NT-RR-AUTO
auto-mode is selected. After the receiver has
been super-frame synchronized, UAI command
allows UID to send SN3 signal to the line.
0111 (QM):
Quiet Mode
In this mode, UID does not react to any linestatus
change. UID can be powered up or down and
ready for a cold start or a warm start. All configu-
ration registers and coefficients remain un-
changed. Quiet Mode is disabled by any other
command.
Note: Inside UID, an logical or is implemented
with this QM primitive and the QM bit in CR6 reg-
ister.
1000 (AR):
ActivationRequest
Beeing in the Power Up and deactivated state
STLC5411
36/72
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