IDT82V2058(2004) 데이터 시트보기 (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

CLK

RTIP

1

RRING

RD

CV

3

5

V

7

2

4

6

1

2

34

5

V

6

Bipolar violation

Bipolar Violation detected

Figure - 7. AMI Bipolar Violation

Code violation

CLK

RTIP 1

3

5

4 consecutive zeros

RRING

2

4

V

V

6

RD

1

2

34

56

CV

Excessive zero detected

Code violation detected

Figure - 8. HDB3 Code Violation & Excessive Zero

1.20

sive zero and code violation are reported respectively. When

1.00

configured in AMI decoding mode, only bipolar violation can be re-

ported.

0.80

The error detection is available only in single rail mode where the

0.60

pin RDNn/CVn is used as error report output (CVn pin).

The configuration and report status of error detection are summa-

0.40

rized in Table-6.

0.20

TRANSMITTER

In transmit path, data in NRZ (non return to zero) format are

clocked into the device on TDn and encoded by AMI or HDB3 line

code rules when single rail mode is configured or pre-encoded data

in NRZ format are input on TDPn and TDNn when dual rail mode is

configured. The data are sampled into the device on falling edges of

TCLKn. Jitter attenuator, if enabled, is provided with a FIFO which the

data to be transmitted are passing through. A low jitter clock is

generated by an integral digital phase-locked loop and is used to

read data from the FIFO. The shape of the pulses should meet the

E1 pulse template after the signal is passed through different cable

types. Bipolar violation, for diagnosing, can be inserted on pin BPVIn

if AMI line code rule is enabled.

0.00

-0.20

-300

-200

-100

0

Time (ns)

100

200

300

Figure - 9. CEPT Waveform Template

Waveform Shaper

E1 pulse template, specified in ITU-T G.703, is shown in Figure-9.

The device has built-in transmit waveform templates for cable of 75Ω

or 120Ω.

The built-in waveform shaper use an internal high frequency clock

which is 16XMCLK as clock reference. This function will be bypassed

when MCLK is unavailable.

15

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