STLC5432 datasheet(15/46 Pages) STMICROELECTRONICS

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9.1 Reset Register

Dummy Register

The software reset of the circuit is performed

when this register is addressed whatever the

value of its bits may be. Reading or writing is ir-

relevant. All the programmable registers are con-

figurated by the default value indicated in each

frame is launched in accordance with the proce-

dure described in the introduction.

9.2 ALR: Alarm Register

EXT1

LOF

915

AIS

LOS

After Reset = 88H

LOS

Loss of Signal.

This bit is set to 1 when ten consecutive

zeros have been detected before the

HDB3/BIN decoder.

AIS

Alarm Indication Signal:

this bit is set to 1 in accordance with G.775

when the incoming signal is recived with

only two, or less, zero for two consecutive

double frame period (i.e. 512 x 2 bit).

915

This bit is set to 1 when 915 errored CRC

message blocks have been received within

1 second.

LOF

Loss of Frame Alignment Word.

When at 1, the synchronization is lost.

One second Clock.

This bit is set to one every second when

there is synchronization. The number of

faults which have been counted during the

previous second is in fault counters FCR,

ECR and PCR.

A bit Received.

This bit is set to 1 when the bit 3 of the

odd time slot zero has been received

consecutively two times at 1.

EXT1

Extension bit 1.

This bit is set to 1 when one bit out of

CAR1 Register bits is put to 1.

9.3 AMR Alarm Mask Register

MEXT1 MAR MSC MLOF M915

MAIS MLOS

After Reset = FFH

This register can be written or read.

When a bit of this register is set to 1, the corre-

sponding bit of the ALR register, which has the

same number, is masked and an interrupt cannot

be generated by this bit.

9.4 CAR1: Complementary Alarm Register 1

EXT2

Sa6R TS0R

CRCF WER

After Reset = 80H

WER

Frame Word Error Rate.

This bit is at ”1”when the threshold of fault

condition has been reached; this bit is at

”0” when the threshold of deactivating has

been reached. These two thresholds are

indicated by the error Rate Threshold

is validated when the synchronization is

achieved.

CRCF CRC Frame.

After remultiframe time, this bit is at ”1”

when an eight frame block has been

received with an error.

E Bit received.

ER bit is at ”1” during the frame 13

received when the E1 bit value of the same

frame 13 is zero.

ER bit is at ”1” during the frame 15 received

when the E2 bit value of the previous frame

15 is zero (E1 and E2 = first bit of time slot

zero in frames 13 and 15 respective).

TS0R

Time slot Zero Register.

This bit is at ”1” when the TS0RR Register has

been loaded in accordance withCR8

Sa6R

Sa6R Register.

This bit is put to one when Sa6RR

with SaT bit (CR6 Register).

EXT2

EXTENSION Bit 2

This bit is at ”1” when one bit out of

CAR2 Register bits has been set to ”1”.

9.5 CAMR1 Complementary Alarm Mask

MEXT2 Nu MSaRm MTSOR MER MCRCF MWER

At Reset = FFH

This register can be read or written.

STLC5432

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