STLC5411FN datasheet(39/72 Pages) STMICROELECTRONICS

39 / 72 page

(H1), AR instruction forces UID through the ap-

propriate sequence to activate the line by sending

TN followed by SN1. Beeing in the U-only-active

state (H8A), AR command forces the sai bit equal

1 to the line. Is intended to transfer to the network

an activation attempt at the S/T interface.

1011 (SP3): Send Single Pulse +3 and -3

SP3 test command forces UID to send +3, -3

pulses to the line, one pulse per frame.

1100 (AI): Activation Indicate

AI command forces act bit equal one in SN3 sig-

nal transmitted to the line. Is intended to reflect an

activate state at the S/T interface.

1110 (AIL): Activation Indicate Loopback

Identical to AI command. Ensure direct compati-

bility with status indications of SID-GCI.

1111 (DI): Deactivation Indicate

The DI command allows the UID to automatically

enter the power down state if the line is deacti-

vated. DI command has no effect as long as the

line is not deactivated (DI status indication re-

ported).

NT mode: Status indication

0000 (DP/LSD): Deactivation pending / Line sig-

nal detected

When in the deactivated state (H1) either pow-

ered up or down, LSD status indication is re-

ported if TN wake-up tone is detected except if

NT1 AUTO is selected; in this configuration, UID

must check uoa bit before to send (or not) LSD.

When in the superframe-synchronized states, DP

status indication reports that the dea bit has been

received equal zero from the line. UID enters in

the receive reset state. When NT1-AUTO mode is

selected, DP status indication is reported also

when a transmission error has been detected on

the loop. This is intended to ensure immediate

deactivation of the S/T interface.

0001 (EIU): Error Indication User

EIU status indication is reported in following

cases:

a. to acknowledge RES command. UID is deacti-

vated, ready for a cold start.

b. to report a Loss of signal for more then 480ms

on the line.

c. to report a Loss of synchronization for more

than 480ms on the line. In this case, when NT-

RR-AUTO is selected, EIU is replaced by

RES;

d. to report that an expire of Timer 4 interrupt has

reset UID ready for a cold start.

When NT1-AUTO is selected, EIU is replaced by

(DP) (except in case c.).

0100 (EI): Error Indication

EI status indication reports that act bit has been

detected equal zero.

0110 (UAP): U interface Activation pending

Is significant only when RR bit in CR2 has been

set equal one or if NT-RR-AUTO mode is se-

lected. UAP reports that the receiver is super-

frame synchronized with uoa bit received equal

zero.

1000 (AP): Activation Pending

AP reports that the receiver is superframe syn-

chronized with uoa bit received equal one .

1010 (ARL): Activation Request Loopback

Is significant only when NT1-AUTO or NT-RR-

AUTO mode is selected. ARL reports that an eoc

message has been received requiring to operate

a local 2B+D loopback. When connected to SID-

GCI in a NT1 or to UID in LT-RR-AUTO mode in

a regenerator, 2B+D loopback command is there-

fore automatically provided.

1100 (AI): Activation Indication

AI reports that UID is superframe synchronized

with act and uoa bits received equal one.

1111 (DI): Deactivation Indication

DI reports that UID has entered the deactivated

state (H1).

LT mode: Command

0000 (PUP/DR): Power Up / Deactivation Re-

quest When in the power down state, PUP com-

mand powers up the device ready for a cold or a

warm start. When in one of the superframe syn-

chronized states, DR command forces dea bit on

the line equal zero for four consecutive superfra-

mes before ceasing transmission.

0001 (RES): Reset

RES command resets UID ready for a cold start.

Configuration registers are not changed. RES can

be operated when the device is either powered up

or down. If RES command is applied when the

line is not fully deactivated, UID returns EIU indi-

cation and goes in J1 state (Receive Reset).

If RES command is applied when the line is not

fully deactivated, UID properly ends the activation

before to come back in J1 state; in this case EIU

indication is returned.

0010 (SP1): Send Single Pulse +1 and-1

SP1 test command forces UID to send +1, -1,

pulses to the line, one pulse per frame.

0011 (RDT): Random Data Transmitted

RDT test command forces UID to send data with

random equiprobable levels at 80 kbaud.

0100 (FA0): Force act bit to Zero

FA0 command forces the act bit to 0 in the SL3

signal transmitted to the line. Is intended to reflect

a transmission failure detected on the network

side of the loop relative to UID.

STLC5411

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