STLC5412P datasheet(45/74 Pages) STMICROELECTRONICS

45 / 74 page

RR = 1:

UID activation/deactivation complies

with

the

requirements for

repetor

equipment. ”LT” or ”NT” behaviour is

selected by means of bit NTS. BP1

and BP2 break-points should be set

equal one too. See state matrix for the

detailed behaviour of UID in this mode

of operation.

Configuration Register 3 (CR3)

After reset: 00H

LB1

LB2

LBD

DB1

DB2

DBD

TLB

T15D

LB1, LB2, LBD Line side Loopback select.

When set high they turn each individual B1, B2,

or D channel from the Line receive input to the

Line transmit output. They may be set separately

or together. The loopback is operated close to Bx

and Br (or Dx and Dr if the D port is selected).

These loop backs ensures channels integrity.

DB1, DB2, DBD Digital side Channel Loopback

select.

When set high they turn each individual B1, B2,

or D channel from the Digital Interface receive in-

put to the Digital Interface transmit output. They

may be set separately or together. The loopback

is operated close to Bx and Br (or Dx and Dr if D

port selected). These loop backs ensures chan-

nels integrity whatever the selected format or as-

signed channels time slot.

TLB Transparent Loopback select

TLB = 0: Digital loopbacks are non transparent.

When line side loopback is set, data

transmitted onto the digital interface is

forced to

one. When digital side

loopback is set, data transmitted onto

the line is forced to 1 in NT mode and

to 0 in LT mode.

TLB = 1: 2B+D

transparently

transferred

through the UID.

T15D Timer 15 second disabled

T15D = 0: On-chip 15 second timer (timer 4 or 5

of ANSI standard) is enabled and

ensure full reset of the activation

procedure

case

non

synchronization of the line within 15

second.

T15D = 1: On-chip 15 second timer is disabled.

This means for instance that UID may

attempt to synchronize for ever.

Configuration Register 4 (CR4)

After reset: E0H

EB1

EB2

FFIT

ESFr CTLIO MOB

CTC

EB1 B1 channel Enabling

EB1 = 1: Selected B1 channel time-slot on the

DSI/GCI interface is enabled. Note that

transparency of B1 channel remains

under control of the activation state

machine and the ETC bit in CR2.

EB1 = 0: Selected B1 channel time-slot on the

DSI/GCI interface is disabled: Br output

remains in high impedance state and

data on Bx input is ignored. Ones (NT)

or zeroes (LT) are transmitted on the

line.

EB2 B2 channel Enabling Identical to EB1 bit but

for B2 channel.

ED D channel enabling identical to EB1 but for D

channel on Bx/Br pin or DX/Dr pin depending on

DEN bit in CR2 register.

FFIT FIFOs interrupt.

FFIT = 1: overflow or underflow of the TXFIFO

and RXFIFO are reported in STATUS

µW mode, a MONITOR message is

automatically sent in GCI mode.

FFIT = 0: No interrupt or message is generated

when FIFOs overflow or underflow.

ESFr Enable SFSr on pin 25 (40)

ESFr = 0: LSD output is selected on pin 25 (40).

ESFr = 1: SFSr output is selected on pin 25 (40).

CTLIO Control IO (significant in GCI mode only)

CTLIO = 1: The input pins configurated via CR5

every change even if the UID is

powered down in master mode; that

is to say UID is able to wake up

itself, to provide the clocks, to sends

the message. After that UID is

automatically powered down except

if a PUP command is sent to it.

CTLIO = 0: In master mode and powered down,

the UID does not react to an input

pin change.

MOB Mask Overhead Bits.

MOB = 0: No Mask on overhead bit interrupts.

STLC5412

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