IDT82V2058(2004) 查看數據表（PDF） - Integrated Device Technology

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IDT82V2058
(Rev.:2004)

OCTAL E1 SHORT HAUL LINE INTERFACE UNIT

Integrated Device Technology 

IDT82V2058 OCTAL E1 SHORT HAUL LINE INTERFACE UNIT

INDUSTRIAL TEMPERATURE RANGES

TABLE - 3. CONFIGURATION OF THE LINE CODE RULE

Hardware Mode

CODE

Line Code Rule

L

All channels in HDB3

H

All channels in AMI

Host Mode

CODE in GCF CODEn in e-CODE SINGn in e-SINGn

0

0/1

0

0

0

1

1

0/1

0

1

1

1

0

1

1

1

0

1

Line Code Rule

All channels in HDB3

All channels in AMI

CHn in AMI

CHn in HDB3

TABLE - 4. LOS CONDITION IN CLOCK RECOVERY MODE

STANDARD

G.775 for E1

ETSI 300233 for E1

LOS Continuous Intervals

32

2048 (1 ms)

Detected

Amplitude

below typ. 310mV (Vpp)

below typ. 310mV (Vpp)

LOS

Cleared

Density

Amplitude

12.5% (4 marks in a sliding 32-bit period)

with no more that 15 continuous zeros

exceed typ. 540mV (Vpp)

12.5% (4 marks in a sliding 32-bit period)

with no more than 15 continuous zeros

exceed typ. 540mV (Vpp)

Signal on

pin LOSn

H

L

Loss of Signal (LOS) Detection

The Loss of Signal Detector monitors the amplitude and density of

the received signal on Receiver line before the transformer

(measured on port A, B in Figure 12). The loss condition is reported

by pulling pin LOSn to high. In the same time, LOS alarm registers

track LOS condition. When LOS detected or cleared, an interrupt will

generate if not masked. In host mode, the detection supports the ITU-

G.775 and ETSI 300233. In hardware mode, it only supports the ITU-

G.775 specification.

Table-4 summarizes the conditions of LOS in clock recovery

mode.

In data recovery mode, the LOS condition is cleared upon

detecting the signal level exceeds 540mV.

During LOS, the RDPn/RDNn output the sliced data when bit

AISE(Alam Indication Signal Enable) in register GCF is 0 or output all

ones as AIS (Alarm Indication Signal) when bit AISE is set to 1; The

RCLKn is replaced by MCLK only if the AISE is set.

Alarm Indication Signal Detection (AIS)

Alarm Indication Signal is available only in host mode with clock

recovery, as Table-5 shows.

Error Detection

The device can detects excessive zero, bipolar violations and

HDB3 code violations, refer to figure-7, 8, 9. All the three kinds of er-

rors are reported in both host mode and hardware mode with HDB3

line code rule is used. Moreover, in host mode, the expanded regis-

ters e-CZER and e-CODV are used to determine whether the exces-

TABLE - 5. AIS CONDITION

AIS Detected

AIS Cleared

ITU G.755 for E1 (register LAC defaulted to 0)

Less than 3 zeros contained in each of two consecutive

512-bit stream are received

3 or more zeros contained in each of two consecutive

512-bit stream are received

ETSI 300233 for E1 (register LAC is 1)

Less than 3 zeros contained in a 512-bit stream

are received

3 or more zeros contained in a 512-bit stream

are received

TABLE - 6. ERROR DETECTION

Hardware Mode

Line Code Pin CVn Reports

AMI

Bipolar Violation

Bipolar Violation

HDB3

+ Code Violation

+ Excessive Zero

Host Mode

Line Code CODVn in e-CODV CZERn in e-CZER

Pin CVn Reports

AMI

-

-

Bipolar Violation

0

0

Bipolar Violation + Code Violation

HDB3

0

1

1

Bipolar Violation + Code Violation + Excessive Zero

0

Bipolar Violation

1

1

Bipolar Violation + Excessive Zero

14

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